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78Q2120C 10/100BASE-TX Transceiver
DATA SHEET
January 2009
DESCRIPTION
The 78Q2120C is a 10BASE-T/100BASE-TX Fast Ethernet transceiver. It includes integrated MII, ENDECs, scrambler/descrambler, dual-speed clock recovery, and full-featured auto-negotiation function. The transmitter includes an on-chip pulse-shaper and a low-power line driver. The receiver has an adaptive equalizer and a baseline restoration circuit required for accurate clock and data recovery. The transceiver interfaces to Category-5 unshielded twisted pair (Cat5 UTP) cabling for 100BASE-TX/10BASE-T and Category-3 unshielded twisted pair for 10BASE-T. Connection to the line media is via 1:1 isolation transformers. No external filter is required. Interface to the MAC is accomplished through an IEEE-802.3 compliant Media Independent Interface (MII). The product is fabricated in an advanced CMOS process for high performance and low power operation.
FEATURES
* 10BASE-T/100BASE-TX IEEE-802.3 compliant TX and RX functions requiring a dual 1:1 isolation transformer interface to the line Integrated MII, 10BASE-T/100BASE-TX ENDEC, 100BASE-TX scrambler/descrambler, and fullfeatured auto-negotiation function Full duplex operation capable PCS Bypass supports 5-bit symbol interface Register-programmable transmit amplitude Dual speed digital clock recovery Automatic polarity correction during autonegotiation and 10BASE-T signal reception Power-saving and power-down including transmitter disable modes
*
* * * * * * * * * *
LED indicators: LINK, TX, RX, COL, 100, 10, FDX User programmable Interrupt pin 64-Pin TQFP (JEDEC LQFP) package Single 3.3 V 0.3V Supply
BLOCK DIAGRAM
4B/5B Encoder, Scrambler, Parallel/Serial
100M
NRZ/NRZI MLT3 Encoder TX CLK GEN
Pulse Shaper Pulse Shaper and Filter TXOP/N MDI RXIP/N Auto Negotiation 10M 100M
RX_CLK TX_CLK RXD[3:0] TXD[3:0] Manchester Decoder, Parallel/Serial Serial/Parallel Descrambler, 5B/4B Decoder PS VCC GND MII Registers & Interface Logic 10M Parallel/Serial, Manchester Encoder Manchester Encoder
Carrier Sense, Collision Detect Collision Detect CLK Recovery
Adaptive EQ, Baseline Wander Correct, MLT3 Decode, NRZI/NRZ MLT3 Decode, NRZI/NRZ LEDs
Clock Reference Clock Reference
CKIN
25MHz
LEDL LEDBTX LEDTX LEDCOL LEDBT LEDFX LEDRX
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(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver FUNCTIONAL DESCRIPTION
GENERAL Power Management The 78Q2120C has three power saving modes: * * * Chip Power-Down Receive Power Management Transmit High Impedance Mode mode of operation, a 25MHz crystal should be connected between the XTLP and XTLN pins. Alternatively, an external 25MHz clock signal can be connected to the CKIN pin. The chip senses activity on the CKIN pin, and will automatically configure itself to use the external clock. In this mode of operation, a crystal is not required and the XTLP and XTLN pins should be left floating or connected together. Transmit Clock Generation The transmitter uses an on-chip frequency synthesizer to generate the transmit clock. In 100BASE-TX operation, the synthesizer multiplies the reference clock by 5 to obtain the internal 125MHz serial transmit clock. In 10BASE-T mode, it generates an internal 20MHz transmit clock by multiplying the 25MHz reference clock by 4/5. The synthesizer references either the local 25 MHz crystal oscillator, or the externally applied clock, depending on the selected mode of operation. Receive Signal Qualification The integrated signal qualifier has separate squelch and unsquelch thresholds. It also includes a built-in timer to ensure fast and accurate signal detection and line noise rejection. Upon detection of two or more valid 10BASE-T or 100BASE-TX pulses on the line receive port, signal detect is indicated. The signal detect threshold is then lowered by about 40%. All adaptive circuits are released from their initial states and allowed to lock onto the incoming data. In 100BASE-TX operation, signal detect is de-asserted when no signal is presented for a period of about 1.2us. In 10BASE-T operation, signal detect is deasserted whenever no Manchester data is received. In either case, the signal detect threshold will return to the squelched level whenever the signal detect indication is de-asserted. Signal detect is also used to control the operation of the clock/data recovery circuit to assure fast acquisition. Receive Clock Recovery In 100BASE-TX mode, the 125MHz receive clock is extracted using a digital DLL-based loop. When no receive signal is present, the CDR is directed to lock onto the 125MHz transmit serial clock. When signal detect is asserted, the CDR will use the received MLT3 signal as the clock reference. The recovered clock is used to re-time the data signal and for conversion of the data to NRZ format. In 10BASE-T mode, the 10MHz receive clock is recovered digitally from the Manchester data using a DLL locked to the reference clock. When Manchester-coded preambles are detected, the
Rev 1.3
Chip power-down is activated by setting the PWRDN bit in MII register MR0.11 or pulling high the PWRDN pin. When the chip is in the power-down mode, all on-chip circuitry is shut off, and the device consumes minimum power. While in the powerdown state, the 78Q2120C still responds to management transactions. Receive power management (RXCC mode) is activated by setting the RXCC bit in MII register MR16.0. In this mode of operation, the adaptive equalizer, the clock recovery phase lock loop (PLL), and all other receive circuitry will be powered down when no valid MLT-3 signal is present at the UTP receive line interface. As soon as a valid signal is detected, all circuits will automatically be powered up to resume normal operation. During this mode of operation, RX_CLK will be inactive when there is no data being received. Note that the RXCC mode is not supported during 10BASE-T operation. Transmit high impedance mode is activated by setting the TXHIM bit in MII register MR16.12. In this mode of operation, the transmit UTP drivers are in a high impedance state and TX_CLK is tri-stated. A weak internal pull-up is enabled on TX_CLK. The receive circuitry remains fully operational. The default state of MR16.12 is a logic low for disabling the transmit high impedance mode. The transmitter is fully functional when MR16.12 is cleared. Analog Biasing and Supply Regulation The 78Q2120C requires no external component to generate on-chip bias voltages and currents. High accuracy is maintained through a closed-loop trimmed biasing network. On-chip digital logic runs off an internal voltage regulator. Hence only a single Vcc supply is required to power-up the device. The on-chip regulator is not affected by the power-down mode. Clock Selection The 78Q2120C will use the on-chip crystal oscillator as the clock source if the CKIN pin is tied low. In this
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(c) 2009 Teridian Semiconductor Corporation
78Q2120C 10/100BASE-TX Transceiver
CDR immediately re-aligns the phase of the clock to synchronize with the incoming data. Hence clock acquisition is fast and immediate. 100BASE-TX OPERATION 100BASE-TX Transmit The 78Q2120C contains all of the necessary circuitry to convert the transmit MII signaling from a MAC to an IEEE-802.3 compliant data-stream driving Cat-5 UTP cabling. The internal PCS interface maps 4 bit nibbles from the MII to 5 bit code groups as defined in Table 24-1 of IEEE-802.3. These 5 bit code groups are then scrambled and converted to a serial stream before being sent to the MLT-3 pulse shaping circuitry and line driver. The pulse-shaper uses current modulation to produce the desired output waveform. Controlled rise/fall time in the MLT-3 signal is achieved using an accurately controlled voltage ramp generator. The line driver requires an external 1:1 isolation transformer to interface with the line media. The center-tap of the primary side of the transformer must be connected to the Vcc supply. 100BASE-TX Receive The 78Q2120C receives a 125MBaud MLT-3 signal through a 1:1 transformer. The signal then goes through a combination of adaptive offset adjustment (baseline wander correction) and adaptive equalization. The effect of these circuits is to sense the amount of dispersion and attenuation caused by the cable and transformer, and restore the received pulses to logic levels. The amount of gain and equalization applied to the pulses varies with the detected attenuation and dispersion and, therefore, with the length of the cable. The 78Q2120C can compensate for cable loss of up to 10dB at 16 MHz. This loss is represented as test-chan 5 in Annex A of the ANSI X3.263:199X specification. The equalized MLT-3 data signal is bi-directionally sliced and the resulting NRZI bit-stream is presented to the CDR where it is re-timed and decoded to NRZ format. The re-timed serial data passes through a serial to parallel converter, then is descrambled and aligned into 5 bit code groups. The receive PCS interface maps these code groups to 4 bit data for the MII as outlined in Table 24-1 in Clause 24 of IEEE-802.3. PCS Bypass Mode (Auto-negotiate must be off) The PCS Bypass mode is entered by pulling PCSBP high or by setting register bit MR 16.1. In this mode the 78Q2120C accepts scrambled 5 bit code words at the TX_ER and TXD[3:0] pins, TX_ER being the MSB of the data input. The 5 bit code groups are converted to MLT-3 signal for transmission. The received MLT-3 signal is converted to 5 bit NRZ code groups and output from the RX_ER and RXD[3:0] pins, RX_ER being the MSB of the data output. The RX_DV and TX_EN pins are unused in PCS Bypass mode. 10BASE-T OPERATION 10BASE-T Transmit The 78Q2120C takes 4-bit parallel NRZ data via the MII interface and passes it through a parallel to serial converter. The data is then passed through a Manchester encoder, pre-emphasis pulse-shaper, media filter, and finally to the twisted-pair line driver. The pulse-shaper and filter ensure the output waveforms meet the voltage template and spectral content requirements detailed in Clause 14 of IEEE802.3. Interface to the twisted-pair media is through a center-tapped 1:1 transformer. No external filtering is required. During auto-negotiation and 10BASE-T idle periods, link pulses are transmitted. The 78Q2120C employs an onboard timer to prevent the MAC from capturing a network through excessively long transmissions. When this timer expires, the chip enters the jabber state and transmission is halted. The jabber state is exited after the MII goes idle for 500250ms. 10BASE-T Receive The 78Q2120C receives Manchester-encoded 10BASE-T data through the twisted pair inputs and re-establishes logic levels through a slicer with a smart squelch function. The slicer automatically adjusts its level after detection of valid data with the appropriate levels. Data is passed on to the CDR where the clock is recovered, and the data is retimed and decoded. From there, data enters the serial-to-parallel converter for transmission to the MAC via the Media Independent Interface. Interface to the twisted-pair media is through an external 1:1 transformer. Polarity information is detected and corrected within internal circuitry. Polarity Correction The 78Q2120C is capable of either automatic or manual polarity reversal for 10BASE-T and auto-negotiation functions. Register bits MR16.5 and MR16.4 control this feature. The default is automatic mode where MR16.5 is low and MR16.4 indicates if the detection circuitry has inverted the input signal. To enter manual mode, MR16.5 should be set high and MR16.4 will then control the signal polarity.
Rev 1.3
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(c) 2009 Teridian Semiconductor Corporation
78Q2120C 10/100BASE-TX Transceiver
SQE TEST The 78Q2120C supports the Signal Quality Error (SQE) function detailed in IEEE-802.3. At an interval of 1s after each negative transition of the TXEN pin in 10BASE-T mode, the COL pin will go high for a period of 1s. SQE is not signaled during transmission after collision is detected. SQE is automatically disabled when repeater mode is enabled. This function can be disabled through register bit MR16.11. Natural Loopback When enabled, whenever the 78Q2120C is transmitting and not receiving on the twisted pair media (10BASE-T Half Duplex mode), data on the TXD[3:0] pins is looped back onto the RXD[3:0] pins. During a collision, data from the RXI pins is routed to the RXD[3:0] pins. The natural loopback function is enabled through register bit MR16.10. Repeater Mode When the RPTR pin is high or register bit MR16.15 is set, the 78Q2120C is placed in repeater mode. In this mode, full duplex operation is prohibited, CRS responds only to receive activity and, in 10BASE-T mode, the SQE test function is disabled. AUTO-NEGOTIATION The 78Q2120C supports the auto-negotiation functions of Clause 28 of IEEE-802.3 for 10/100 Mbps operation over copper wiring. This function can be enabled via a pin selection or register settings. If the ANEGA pin is tied high, the autonegotiation function defaults to ON and bit MR0.12 (ANEGEN) is high after reset. Software can disable the auto-negotiation function by writing to bit MR0.12. If the ANEGA pin is tied low, the function defaults to OFF and bit MR0.12 is set low after reset and cannot be written to. The contents of register MR4 are sent to the 78Q2120C's link partner during auto-negotiation using fast link pulse coding. Bits MR4.8:5 reflect the state of the TECH[2:0] pins after reset. If TECH[2:0] = `111', then all 4 bits are high. If TECH[2:0] = `001', then only bit 5 is high. After reset, software can change any of these bits from a `1' to a `0'; but not from a `0' to a `1'. Therefore, a technology permitted by the setting of the TECH pins can be disabled, but cannot be enabled through register selection. With auto-negotiation enabled, the 78Q2120C will start sending fast link pulses at power on, loss of link or upon a command to restart. At the same time, it will look for either 10BASE-T idle, 100BASE-TX idle, or fast link pulses from its link partner. If either idle pattern is detected, the 78Q2120C configures itself in half-duplex mode at the appropriate speed. If it detects fast link pulses, it decodes and analyzes the link code transmitted by the link partner. When three identical link code words are received (ignoring the acknowledge bit) the link code word is stored in register MR5. Upon receiving three more identical link code words, with the acknowledge bit set, the 78Q2120C configures itself to the highest priority technology common to the two link partners. The technology priorities are, in descending order: 100BASE-TX, Full Duplex 100BASE-TX, Half Duplex 10BASE-T, Full Duplex 10BASE-T, Half Duplex Once auto-negotiation is complete, register bits MR18.11:10 will reflect the actual speed and duplex that was chosen. If auto-negotiation fails to establish a link for any reason, register bit MR18.12 will reflect this and auto negotiation will restart from the beginning. Writing a `1' to bit MR0.9(RANEG) will also cause autonegotiation to restart. MEDIA INDEPENDENT INTERFACE MII Transmit and Receive Operation The MII interface on the 78Q2120C provides independent transmit and receive paths for both 10Mb/s and 100Mb/s data rates as described in Clause 22 of the IEEE-802.3 standard. The transmit clock, TX_CLK, provides the timing reference for the transfer of TX_EN, TXD[3:0], and TX_ER signals from the MAC to the 78Q2120C. TXD[3:0] is captured on the rising edge of TX_CLK when TX_EN is asserted. TX_ER is also captured on the rising edge of TX_CLK and is asserted by the MAC to request that an error code group is to be transmitted. The assertion of TX_ER is ignored when the 78Q2120C is operating in 10BASE-T mode. The receive clock, RX_CLK, provides the timing reference to transfer RX_DV, RXD[3:0], and RX_ER signals from the 78Q2120C to the MAC. RX_DV transitions synchronously with respect to RX_CLK and is asserted when the 78Q2120C is presenting valid data on RXD[3:0]. RX_ER is asserted and is synchronous to RX_CLK when a code group violation has been detected in the current receive packet.
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(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver
Station Management Interface The station management interface consists of circuitry which implements the serial protocol as described in Clause 22.2.4.5 of IEEE-802.3. A 16bit shift register receives serial data applied to the MDIO pin at the rising-edge of the MDC clock signal. Once the preamble is received, the station management control logic looks for the start-offrame sequence and a read or write op-code, followed by the PHYAD and REGAD fields. For a read operation, the MDIO port becomes enabled as an output and the register data is loaded into a shift register for transmission. The 78Q2120C can work with a one bit preamble rather than the 32 bits prescribed by IEEE-802.3. This allows for faster programming of the registers. If a register does not exist at an address indicated by the REGAD field or if the PHYAD field does not match the 78Q2120C PHYAD indicated by the PHYAD pins, a read of the MDIO port will return all ones. For a write operation, the data is shifted in and loaded into the appropriate register after the sixteenth data bit has been received. When the PHYAD field is all zeros, the Station Management Entity (STA) is requesting a broadcast data transaction. All PHYs sharing the same Management Interface must respond to this broadcast request. The 78Q2120C will respond to the broadcast data transaction. ADDITIONAL FEATURES LED Indicators There are seven LED pins that can be used to indicate various states of operation of the 78Q2120C. There is an LED pin that indicates the link is up (LEDL), others that indicate the 78Q2120C is either transmitting (LEDTX) or receiving (LEDRX), one that signals a collision event (LEDCOL), two more that reflect the data rate (LEDBTX and LEDBT), and one that reflects full duplex mode of operation (LEDFDX). Interrupt Pin The 78Q2120C has an Interrupt pin (INTR) that is asserted whenever any of the eight interrupt bits of MR17.7:0 are set. These interrupt bits can be disabled via the MR17.15:8 Interrupt Enable bits. The Interrupt Polarity bit, MR16.14, controls the active level of the INTR pin. When the INTR pin is not asserted, this pin is held in a high impedance state. An external pull-up or pull-down resistor may be required for use with the INTR pin. APPLICATIONS REQUIREMENTS RXIP/N Termination Connection The input circuitry of the TERIDIAN 78Q2120C has changed for continuing performance improvements. Device revision C09 requires that the RXIP/N termination resistors and transformer center tap connections be directly connected to VCC for proper receiver operation. Refer to Figure 1: Typical Applications Circuit for the schematic showing the required RXIP/N termination resistors and transformer center tap connections to VCC for revision 78Q2120C.
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(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver PIN DESCRIPTION
LEGEND TYPE A CIU CID CIS CO DESCRIPTION Analog Pin TTL-level Input w/ Pull-up (5V compatible) TTL-level Input w/ Pull-down (5V compatible) TTL-level Input w/ Schmitt Trigger (5V compatible) CMOS Output S Supply G Ground TYPE CI CIO COZ DESCRIPTION TTL-level Input (5V compatible) TTL-compatible Bi-directional Pin (5V compatible) Tristate-able CMOS output
MII (MEDIA INDEPENDENT INTERFACE) NAME TX_CLK PIN 27 TYPE COZ DESCRIPTION TRANSMIT CLOCK: TX_CLK is a continuous clock, which provides a timing reference for the TX_EN, TX_ER and TXD[3:0] signals from the MAC. The clock frequency is 25MHz in 100BASE-TX mode and 2.5MHz in 10BASE-T mode. This pin is tristated in the isolate mode and the TXHIM mode. TRANSMIT ENABLE: TX_EN is asserted by the MAC to indicate that valid data for transmission is present on the TXD[3:0] pins. TRANSMIT DATA: TXD[3:0] receives data from the MAC for transmission on a nibble basis. This data is captured on the rising edge of TX_CLK when TX_EN is high. TRANSMIT ERROR: TX_ER is asserted high by the MAC to request that an error code-group be transmitted when TX_EN is high. In PCS bypass mode this pin becomes the MSB of the transmit 5-bit code group. CARRIER SENSE: When the 78Q2120C is not in repeater mode, CRS is high whenever a non-idle condition exists on either the transmitter or the receiver. In repeater mode, CRS is only active when a non-idle condition exists on the receiver. This pin is tristated in the isolate mode. COLLISION: COL is asserted high when a collision has been detected on the media. In 10BASE-T mode, COL is also used for the SQE test function. This pin is tristated in the isolate mode. During half duplex operation, the rising edge of COL will occasionally occur upon the rising edge of TX_CLK. RECEIVE CLOCK: RX_CLK is a continuous clock, which provides a timing reference to the MAC for the RX_DV, RX_ER and RXD[3:0] signals. The clock frequency is 25MHz in 100BASE-TX mode, and 2.5MHz in 10BASE-T mode. To reduce power consumption in 100BASE-TX mode, the 78Q2120C provides an optional mode, enabled through MR16.0, in which RX_CLK is held inactive (low) when no receive data is detected. This pin is tristated in the isolate mode. RECEIVE DATA VALID: RX_DV is asserted high to indicate that valid data is present on the RXD[3:0] pins. In 100BASE-TX mode, it transitions high with the first nibble of the preamble and is pulled low when the last data nibble has been received. In 10BASE-T mode, it transitions high when the start-of-frame delimiter (SFD) is detected. This pin is tristated in the isolate mode. RECEIVE DATA: Received data is provided to the MAC via RXD[3:0]. These pins are tristated in the isolate mode.
Rev 1.3
TX_EN TXD[3:0]
28 32-29
CI CI
TX_ER
26
CI
CRS
34
COZ
COL
33
COZ
RX_CLK
24
COZ
RX_DV
23
COZ
RXD[3:0]
19-22
COZ
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(c) 2009 Teridian Semiconductor Corporation
78Q2120C 10/100BASE-TX Transceiver
MII (continued) NAME RX_ER PIN 25 TYPE COZ DESCRIPTION RECEIVE ERROR: RX_ER is asserted high when an error is detected during a frame reception. In PCS bypass mode, this pin becomes the MSB of the receive 5-bit code group. This pin is tristated in the isolate mode. MANAGEMENT DATA CLOCK: MDC is the clock used for transferring data via the MDIO pin. MANAGEMENT DATA INPUT/OUTPUT: MDIO is a bi-directional port used to access management registers within the 78Q2120C. This pin requires an external pull-up resistor as specified in IEEE-802.3.
MDC MDIO
18 17
CIS CIO
PHY ADDRESS NAME PHYAD[4:0] PIN 12-16 TYPE CI DESCRIPTION PHY ADDRESS: Allows 31 configurable PHY addresses. The 78Q2120C always responds to broadcast data transactions via the MII interface when the PHYAD bits are all zero, independent of the logic levels of the PHYAD pins.
PMA (PHYSICAL MEDIA ATTACHMENT) INTERFACE NAME PCSBP PIN 64 TYPE CID DESCRIPTION PCS BYPASS: When high, the 100BASE-TX PCS is bypassed, as well as the scrambler and descrambler functions. Scrambled 5-bit code groups for transmission are applied to the TX_ER, TXD[3:0] pins and received on the RX_ER, RXD[3:0] pins. The RX_DV and TX_EN signals are not valid in this mode. PCS bypass mode is only valid when 100BASE-TX is enabled and auto-negotiation is disabled. This mode can also be entered by setting MR16.1.
CONTROL AND STATUS NAME RST PIN 6 TYPE CIU DESCRIPTION ACTIVE-LOW RESET: When pulled low, the pin resets the chip. The reset pulse must be long enough to guarantee stabilization of the supply voltage and startup of the oscillator. Refer to the Electrical Specifications for the reset pulse requirements. There are 2 other ways to reset the chip: i) ii) PWRDN 7 CID through the internal power-on-reset (activated when the chip is being powered up) through the MII register bit (MR0.15)
POWER-DOWN: The 78Q2120C may be placed in a low power consumption state by setting this signal to logic high. While in the power-down state, the 78Q2120C still responds to management transactions. This power-down state can also be activated using the PWRDN bit in the MII register (MR0.11).
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(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver
CONTROL AND STATUS (CONTINUED) NAME ISO PIN 2 TYPE CI DESCRIPTION ISOLATE: When set to logic one, the 78Q2120C will present a high impedance on its MII output pins. This allows for multiple chips to be attached to the same MII interface. When the 78Q2120C is isolated, it still responds to management transactions. This high impedance state can also be achieved using the ISO bit in the MII register (MR0.10). ISOLATE DEFAULT: This pin determines the power-up/reset default of the ISO bit (MR0.10). If it is connected to VCC, the ISO bit will have a default value of `1'. Otherwise, the bit defaults to `0'. When this signal is tied to VCC, it allows multiple chips to be connected to the same MII interface. AUTO-NEGOTIATION ABILITY: Connect to logic high to enable the autonegotiation function. When connected to logic low, the auto-negotiation logic is disabled and manual technology selection is done through TECH[2:0] pins. This pin is reflected as the ANEGA bit in MR1.3. TECHNOLOGY ABILITY/SELECT: TECH[2:0] sets the technology ability of the chip which is reflected in MR0.13,8, MR1.14:11 and MR4.12:5. TECH[2:0] 111 000 001 010 011 100 101 110 RPTR 50 CID Technology Ability Both 10BASE-T and 100BASE-TX, and Both half and full duplex None 10BASE-T, half duplex 100BASE-TX, half duplex Both 10BASE-T and 100BASE-TX, half duplex only None 10BASE-T Both half and full duplex 100BASE-TX Both half and full duplex
ISODEF
1
CI
ANEGA
47
CI
TECH[2:0]
44-46
CI
REPEATER MODE: When pulled high, this pin puts the chip into repeater mode. In this mode, full duplex is prohibited, CRS responds to receive activity only. In 10BASE-T mode, the SQE test function is disabled. This mode can also be enabled by setting bit MR16.15
MDI (MEDIA DEPENDENT INTERFACE) NAME TXOP/N RXIP/N PIN 61,62 52,51 TYPE A A DESCRIPTION TRANSMIT OUTPUT POSITIVE/NEGATIVE: Transmitter differential outputs for both 10BASE-T and 100BASE-TX operation. RECEIVE INPUT POSITIVE/NEGATIVE: Receiver differential inputs for both 10BASE-T and 100BASE-TX operation.
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(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver
LED INDICATORS The LED pins use standard logic drivers. They output a logic low when the LED is meant to be on and a logic high when it is meant to be off. The LED should be connected in series with a resistor between the output pin and the power supply. NAME LEDL LEDTX LEDRX LEDCOL LEDBTX LEDBT LEDFDX PIN 40 39 38 37 36 48 49 TYPE CO CO CO CO CO CO CO DESCRIPTION LED LINK: ON for link up. LED TRANSMIT: ON when there is a transmission (normally OFF). LED RECEIVE: ON when there is a reception (normally OFF). LED COLLISION: In half duplex mode, this is a collision indicator and turns ON when a collision occurs. In full duplex mode, this LED is held OFF. LED 100BASE-TX: ON for 100BASE-TX connection and OFF for other connections. LEDBTX is OFF during auto-negotiation. LED 10BASE-T: ON for 10BASE-T connection and OFF for other connections. LEDBT is OFF during auto-negotiation. LED FULL DUPLEX: ON when in full duplex mode and OFF when in half duplex mode.
OSCILLATOR/CLOCK NAME CKIN PIN 4 TYPE CIS DESCRIPTION CLOCK INPUT: Connects to a 25 MHz TTL compatible clock source. This pin should be held low when XTLP and XTLN are being used as the 25 MHz clock source. CRYSTAL PINS: Should be connected to a 25 MHz crystal. When CKIN is being used as the 25 MHz clock source, these pins should be left floating or connected together.
XTLP/N
59,58
A
MISCELLANEOUS PIN NAME INTR PIN 35 TYPE COZ DESCRIPTION INTERRUPT PIN: This pin is used to signal an interrupt to the media access controller. The pin is held in the high impedance state when an interrupt is not indicated. The pin will be forced high or low to signal an interrupt depending upon the value of the INPOL bit (MR16.14). The events which trigger an interrupt can be programmed via the Interrupt Control Register located at address MR17. No Connect. Do not connect to ground or supply.
NC
54,56
--
POWER SUPPLY AND GROUND NAME VCC GND PIN 8,11,41, 43,57,63 3,5,9,10, 42,53,55,60 TYPE S G DESCRIPTION 3.3V SUPPLY GROUND
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(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver REGISTER DESCRIPTION
The 78Q2120C implements 11 16-bit registers, which are accessible via the MDIO and MDC pins. The supported registers are shown below in the following table. Attempts to read unsupported registers will be ignored and the MDIO pin will not be enabled as an output, as per the IEEE 802.3 specification. All of the registers except those which are unique to the 78Q2120C, will respond to the broadcast PHYAD value of `00000'. The registers specific to the 78Q2120C occupy address space MR16-22. ADDRESS 0 1 2 3 4 5 6 7 8-14 15 16 17 18 19 20-22 Legend: TYPE R SC 0/1 DESCRIPTION Readable by management. Writeable by management. Self Clearing. Default value upon power up or reset. TYPE DESCRIPTION W Writeable by management. RC Readable by management. Cleared upon a read operation. (0/1) Default value dependent on pin settings. The value in bracket indicates typical case. SYMBOL MR0 MR1 MR2 MR3 MR4 MR5 MR6 MR7 MR8-14 MR15 MR16 MR17 MR18 MR19 MR20-MR22 NAME Control Status PHY Identifier 1 PHY Identifier 2 Auto-Negotiation Advertisement Auto-Negotiation Link Partner Ability Auto-Negotiation Expansion Not Implemented Reserved Not Implemented Vendor Specific Interrupt Control/Status Register Diagnostic Register Transceiver Control Reserved DEFAULT (HEX) (3100) (7809) 000E 70C9 (01E1) 0000 0000 0000 0000 0000 (0140) 0000 0000 4XXX 0000
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(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver MR0: Control Register
BIT 0.15 0.14 SYMBOL RESET LOOPBK TYPE R/SC R/W DEFAULT DESCRIPTION 0 Reset: Setting this bit to `1' resets the device and sets all registers to their default states. This bit is self-clearing. 0 Loopback: When this bit is set to `1', no transmission of data on the network medium occurs and any receive data on the network medium is ignored. The loopback signal path will encompass most of the digital circuitry. Speed Selection: This bit determines the speed of operation of the 78Q2120C. Setting this bit to `1' indicates 100Base-TX operation and a `0' indicates 10Base-T mode. This bit will default to a `1' upon reset. If the TECH[2:0] pins are all logic zero and auto-negotiation is not enabled, this bit will be writeable. If auto-negotiation is not enabled and the TECH[2:0] pins are set to indicate that only 10Base-T is supported, this bit will be forced to logic zero and will not be writeable. If auto-negotiation is not enabled and the TECH[2:0] pins are set to indicate that only 100Base-TX is supported, this bit will be forced to logic one and will not be writeable. When auto-negotiation is enabled, this bit will not be writeable and will have no effect on the 78Q2120C. If the TECH[2:0] pins are brought to zero from another value, this bit will retain its original value until it is overwritten. Auto-Negotiation Enable: Setting this bit to `1' enables the autonegotiation process. This bit can only be set if the ANEGA pin is a logic one and will default to `1' upon reset. If this bit is cleared to `0', manual speed and duplex mode selection is accomplished through bits 0.13 (SPEEDSL) and 0.8 (DUPLEX) of the Control Register or the TECH[2:0] pins according to the table shown in the section describing the TECH[2:0] pins. If the ANEGA pin is brought from `0' to `1' and reset is not asserted, this bit will remain at `0' until a `1' is written. Power-Down: The device may be placed in a low power consumption state by setting this bit to `1'. While in the power-down state, the device will still respond to management transactions. Setting the PWRDN pin high also activates the power-down state. Isolate: When set to `1', the device presents a high-impedance on its MII output pins. This allows for multiple PHY's to be attached to the same MII interface. When the device is isolated, it still responds to management transactions. The default value of this bit depends on the ISODEF pin. When ISODEF pin is tied high, the ISO bit defaults to high. Otherwise, it defaults to low. The Isolate mode can also be activated using the ISO pin. Restart Auto-Negotiation: Normally, the Auto-Negotiation process is started at power up. The process can be restarted by setting this bit to `1'. This bit is self-clearing.
0.13
SPEEDSL
R/W
(1)
0.12
ANEGEN
R/W
(1)
0.11
PWRDN
R/W
0
0.10
ISO
R/W
(0)
0.9
RANEG
R/SC
0
Page: 11 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver MR0: Control Register (continued)
BIT 0.8 SYMBOL DUPLEX TYPE R/W DEFAULT DESCRIPTION (1) Duplex Mode: This bit determines whether the device supports fullduplex or half-duplex. A `1' indicates full-duplex operation and a `0' indicates half-duplex. This bit will default to `0' upon reset and will be writeable if the TECH[2:0] pins are all logic zero and autonegotiation is not enabled. If auto-negotiation is not enabled and the TECH[2:0] pins are set to indicate that only full-duplex is supported, this bit will be forced to `1' and will not be writeable. If auto-negotiation is not enabled and the TECH[2:0] pins are set to indicate that only half-duplex is supported, this bit will be forced to `0' and will not be writeable. When auto-negotiation is enabled, this bit will not be writeable and will have no effect on the device. If the TECH[2:0] pins are brought to zero from another value, this bit will retain its original value until it is overwritten. 0 Collision Test: When this bit is set to `1', the device will assert the COL signal in response to the assertion of the TX_EN signal. Collision test is disabled if the PCSBP pin is high. Collision test can be activated regardless of the duplex mode of operation. Reserved
0.7
COLT
R/W
0.6:0
RSVD
R
0
MR1: Status Register
Bits 1.15 through 1.11 reflect the ability of the 78Q2120C as configured by the TECH[2:0] pins. They do not reflect any ability changes made via the MII Management interface to bits 0.13 (SPEEDSL) , 0.12 (ANEGEN) and 0.8 (DUPLEX). BIT 1.15 1.14 SYMBOL 100T4 100X_F TYPE R R DEFAULT DESCRIPTION 0 100BASE-T4 Ability: Reads `0' to indicate the 78Q2120C does not support 100Base-T4 mode. (1) 100BASE-TX Full Duplex Ability: 0 : Not able 1 : Able 1.13 100X_H R (1) 100BASE-TX Half Duplex Ability: 0 : Not able 1 : Able 1.12 10T_F R (1) 10BASE-T Full Duplex Ability: 0 : Not able 1 : Able 1.11 10T_H R (1) 10BASE-T Half Duplex Ability: 0 : Not able 1 : Able 1.10 100T2_F R 0 100BASE-T2 Full Duplex Ability: Reads `0' to indicate the 78Q2120C does not support 100Base-T2 full duplex mode.
Page: 12 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver MR1: Status Register
BIT 1.9 1.8 1.7 1.6 SYMBOL 100T2_H EXTS RSVD MFPS TYPE R R R R DEFAULT DESCRIPTION 0 100BASE-T2 Half Duplex Ability: Reads `0' to indicate the 78Q2120C does not support 100Base-T2 full duplex mode. 0 0 0 Extended Status Information Availability: Reads `0' to indicate the 78Q2120C does not support Extended Status information on MR15. Reserved Management Frame Preamble Suppression Support: A "0" indicates that the 78Q2120C can read management frames with a preamble. Auto-Negotiation Complete: A logic one indicates that the AutoNegotiation process has been completed, and that the contents of registers MR4,5,6 are valid. Remote Fault: A logic one indicates that a remote fault condition has been detected and remains set until it is cleared. This bit can only be cleared by reading this register (MR1) via the management interface. Auto-Negotiation Ability: When set, this bit indicates the device's ability to perform Auto-Negotiation. The value of this bit is determined by the ANEGEN bit (MR0.12). Link Status: A logic one indicates that a valid link has been established. If the link status should transition from an OK status to a NOT-OK status, this bit will become cleared and remains cleared until it is read. Jabber Detect: In 10Base-T mode, this bit is set during a jabber event. After a jabber event, the bit remains set until cleared by a read operation. Extended Capability: Reads '1' to indicate the 78Q2120C provides an extended register set (MR2 and beyond).
1.5
ANEGC
R
0
1.4
RFAULT
RC
0
1.3
ANEGA
R
(1)
1.2
LINK
R
0
1.1
JAB
RC
0
1.0
EXTD
R
1
MR2: PHY Identifier Register 1
BIT 2.15:0 SYMBOL OUI [23:6] TYPE R VALUE 000Eh DESCRIPTION Organizationally Unique Identifier: This value is 00-C0-39 for TERIDIAN Semiconductor Corporation. This register contains the first 16-bits of the identifier.
MR3: PHY Identifier Register 2
BIT 3.15:10 3.9:4 3.3:0 SYMBOL OUI [5:0] MN RN TYPE R R R VALUE 1Ch 0Ch 9h DESCRIPTION Organizationally Unique Identifier: Remaining 6 bits of the OUI. Model Number: The last 2 digits of the model number 78Q2120C are encoded into the 6 bits. Revision Number: The value `1001' corresponds to the ninth revision of the silicon.
Page: 13 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver MR4: Auto-Negotiation Advertisement Register
BIT 4.15 4.14 4.13 4.12:5 SYMBOL NP RSVD RF TAF TYPE DEFAULT DESCRIPTION R 0 Next Page: Not supported. Reads logic zero. R R/W R/W 0 0 (0Fh) Reserved Remote Fault: Setting this bit to `1' allows the device to indicate to the link partner a Remote Fault Condition. Technology Ability Field: The default value of this field is dependent upon the MR1.15:11 register bits. This field can be overwritten by management to auto-negotiate to an alternate common technology. Writing to this register has no effect until auto-negotiation is reinitiated. Reserved for future technology. Reserved Reserved. 100BASE-T4: operation. The 78Q2120C does not support 100BASE-T4
4.12 4.11 4.10 4.9 4.8
A7 A6 A5 A4 A3
R R/W R/W R R/W
0 0 0 0 (1)
100BASE-TX Full Duplex: If the MR1.14 bit is `1', this bit will be set to `1' upon reset and will be writeable. Otherwise, this bit cannot be set to `1' by the management. 100BASE-TX: If the MR1.13 bit is `1', this bit will be set to `1' upon reset and will be writeable. Otherwise, this bit cannot be set to `1' by the management. 10BASE-T Full Duplex: If the MR1.12 bit is `1', this bit will be set to `1' upon reset and will be writeable. Otherwise, this bit cannot be set to `1' by the management. 10BASE-T: If the MR1.11 bit is `1', this bit will be set to `1' upon reset and will be writeable. Otherwise, this bit cannot be set to `1' by the management. Selector Field: Hard coded with the value of `00001' for IEEE 802.3.
4.7
A2
R/W
(1)
4.6
A1
R/W
(1)
4.5
A0
R/W
(1)
4.4:0
S4:0
R
01h
Page: 14 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver MR5: Auto-Negotiation Link Partner Ability Register
BIT 5.15 5.14 SYMBOL NP ACK TYPE DEFAULT DESCRIPTION R 0 Next Page: When `1' is read, it indicates the link partner wishes to engage in Next Page exchange. R 0 Acknowledge: When `1' is read, it indicates the link partner has successfully received at least 3 consecutive and consistent FLP bursts. Remote Fault: When `1' is read, it indicates the link partner has a fault. Technology Ability Field: This field contains the technology ability of the link partner. The bit definition is the same as MR4.12:5. Selector Field: This field contains the type of message sent by the link partner. For IEEE 802.3 compliant link partner, this field should be `00001'.
5.13 5.12:5 5.4:0
RF A7:0 S4:0
R R R
0 0 00h
MR6: Auto-Negotiation Expansion Register
BIT 6.15:5 6.4 SYMBOL RSVD PDF TYPE DEFAULT DESCRIPTION R 0 Reserved RC 0 Parallel Detection Fault: When `1' is read, it indicates that more than one technology has been detected during link up. This bit is cleared when read. Link Partner Next Page Able: When `1' is read, it indicates the link partner supports the Next Page function. Next Page Able: Reads `0' since the 78Q2120C does not support Next Page function. Page Received: Reads `1' when a new link code word has been received into the Auto-Negotiation Link Partner Ability Register. This bit is cleared upon read. Link Partner Auto-Negotiation Able: When `1' is read, it indicates the link partner is able to participate in the Auto-Negotiation function.
6.3 6.2 6.1
LPNPA NPA PRX
R R RC
0 0 0
6.0
LPANEG A
R
0
Page: 15 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver MR16: Vendor Specific Register
BIT 16.15 SYMBOL RPTR TYPE DEFAULT DESCRIPTION R/W (0) Repeater Mode: When set, the 78Q2120C is put into Repeater mode of operation. In this mode, full duplex is prohibited, CRS responds to receive activity only and, in 10Base-T mode, the SQE test function is disabled. R/W 0 When this bit is `0', the INTR pin is forced low to signal an interrupt. Setting this bit to `1' causes the INTR pin to be forced high to signal an interrupt. Reserved Transmitter High-Impedance Mode: When set, the TXOP/TXON transmit pins and the TX_CLK pin are put into a high-impedance state. The receive circuitry remains fully functional. SQE Test Inhibit: Setting this bit to `1' disables 10Base-T SQE testing. By default, this bit is `0' and the SQE test is performed by generating a COL pulse following the completion of a packet transmission. 10Base-T Natural Loopback: Setting this bit to `1' causes transmit data received on the TXD0-3 pins to be automatically looped back to the RXD[0:3] pins when 10Base-T mode is enabled. Reserved Reserved Reserved Reserved Auto Polarity: During auto-negotiation and 10BASE-T mode, the 78Q2120C is able to automatically invert the received signal due to a wrong polarity connection. It does so by detecting the polarity of the link pulses. Setting this bit to `1' disables this feature. Reverse Polarity: The reverse polarity is detected either through 8 inverted 10Base-T link pulses (NLP) or through one burst of inverted clock pulses in the auto-negotiation link pulses (FLP). When the reverse polarity is detected and if the Auto Polarity feature is enabled, the 78Q2120C will invert the receive data input and set this bit to `1'. If Auto Polarity is disabled, then this bit is writeable. Writing a `1' to this bit forces the polarity of the receive signal to be reversed. Reserved: Must set to `00'.
16.14
INPOL
16.13 16.12
RSVD TXHIM
R R/W
0 0
16.11
SQEI
R/W
0
16.10
NL10
R/W
0
16.9 16.8 16.7 16.6 16.5
RSVD RSVD RSVD RSVD APOL
R/W R/W R/W R/W R/W
0 1 0 1 0
16.4
RVSPOL
R/W
0
16.3:2
RSVD
R/W
0h
Page: 16 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver MR16: Vendor Specific Register (continued)
Bit 16.1 Symbol PCSBP Type R/W Default (0) Description PCS Bypass Mode: When set, the 100Base-TX PCS and scrambling/ descrambling functions are bypassed. Scrambled 5-bit code groups for transmission are applied to the TX_ER, TXD[3:0] pins and received on the RX_ER, RXD[3:0] pins. The RX_DV and TX_EN signals are not valid in this mode. PCSBP mode is valid only when 100Base-TX mode is enabled and auto-negotiation is disabled. Receive Clock Control: This function is valid only in 100Base-TX mode. When set to `1', the RX_CLK signal will be held low when there is no data being received (to save power). The RX_CLK signal will restart 1 clock cycle before the assertion of RX_DV and be shut off 64 clock cycles after RX_DV goes low. RXCC is disabled when the loopback mode is enabled (MR0.14 is high). This bit should be kept at logic zero when PCS Bypass mode is used.
16.0
RXCC
R/W
0
MR17: Interrupt Control/Status Register
The Interrupt Control/Status Register provides the means for controlling and observing events which trigger an interrupt on the INTR pin. This register can also be used in a polling mode via the MII Serial Interface as a means to observe key events within the PHY via one register address. Bits 0 through 7 are status bits, which are each set to logic one based upon an event. These bits are cleared after the register is read. Bits 8 through 15 of this register, when set to logic one, enable their corresponding bit in the lower byte to signal an interrupt on the INTR pin. The level of this interrupt can be set via the MR16.14 (INPOL) bit. BIT 17.15 17.14 17.13 17.12 17.11 17.10 17.9 17.8 17.7 17.6 17.5 17.4 SYMBOL JABBER_IE RXER_IE PRX_IE PDF_IE LP-ACK_IE LS_CHG_IE RFAULT_IE ANEGCOMP_IE JAB_INT RXER_INT PRX_INT PDF_INT TYPE DEFAULT DESCRIPTION R/W 0 Jabber Interrupt Enable R/W R/W R/W R/W R/W R/W R/W RC RC RC RC 0 0 0 0 0 0 0 0 0 0 0 Receive Error Interrupt Enable Page Received Interrupt Enable Parallel Detect Fault Interrupt Enable Link Partner Acknowledge Interrupt Enable Link Status Change Interrupt Enable Remote Fault Interrupt Enable Auto-Negotiation Complete Interrupt Enable Jabber Interrupt: This bit is set high when a Jabber event is detected by the 10Base-T circuitry. Receive Error Interrupt: This bit is set high when the RX_ER signal transitions high. Page Received Interrupt: This bit is set high when a new page has been received from the link partner during auto-negotiation. Parallel Detect Fault Interrupt: This bit is set high by the autonegotiation logic when a parallel detect fault condition is indicated.
Page: 17 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver MR17: Interrupt Control/Status Register (continued)
BIT 17.3 SYMBOL LP-ACK_INT TYPE DEFAULT DESCRIPTION RC 0 Link Partner Acknowledge Interrupt: This bit is set high by the auto-negotiation logic when FLP bursts are received with the acknowledge bit set. RC RC RC 0 0 0 Link Status Change Interrupt: This bit is set when the link transitions from an OK status to a FAIL status. Remote Fault Interrupt: This bit is set when a remote fault condition has been indicated by the link partner. Auto-Negotiation Complete Interrupt: This bit is set by the autonegotiation logic upon successful completion of auto-negotiation.
17.2 17.1 17.0
LS_CHG_INT RFAULT_INT ANEGCOMP_INT
MR18: Diagnostic Register
BIT 18.15:13 18.12 SYMBOL RSVD ANEGF TYPE R RC DEFAULT DESCRIPTION 00h Reserved: Must set to `00h'. 0 Auto-Negotiation Fail Indication: This bit is set when autonegotiation completes and no common technology was found. It remains set until read. Duplex Indication: This bit indicates the result of the autonegotiation for duplex arbitration as follows: 0 : Half-duplex was the highest common denominator 1 : Full-duplex was the highest common denominator 18.10 RATE R 0 Rate Indication: This bit indicates the result of the auto-negotiation for data rate arbitration as follows: 0 : 10Base-T was the highest common denominator 1 : 100Base-TX was the highest common denominator 18.9 RXSD R 0 Receiver Signal Detect Indication: In 10Base-T mode, this bit indicates that Manchester data has been detected. In 100Base-TX mode, it indicates that the receive signal activity has been detected (but not necessarily locked on to). Receive PLL Lock Indication: Indicates that the Receive PLL has locked onto the receive signal for the selected speed of operation (10Base-T or 100Base-TX). Reserved: Must set to `00h'.
18.11
DPLX
R
0
18.8
RX_LOCK
R
0
18.7:0
RSVD
R
00h
Page: 18 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver MR19: Transceiver Control
BIT 19.15:12 19.11:10 SYMBOL RSVD TXO[1:0] TYPE R R/W DEFAULT DESCRIPTION 0100 Reserved 01 Transmit Amplitude Selection: Sets the transmit output amplitude to account for transmit transformer insertion loss. 00 : Gain set for 0.0dB of insertion loss 01 : Gain set for 0.4dB of insertion loss 10 : Gain set for 0.8dB of insertion loss 11 : Gain set for 1.2dB of insertion loss 19.9:0 RSVD R XXXh Reserved
MR20: Reserved
BIT 20.15:0 SYMBOL Reserved TYPE na DEFAULT DESCRIPTION XXXXh Reserved
MR21: Reserved
BIT 21.15:0 SYMBOL Reserved TYPE na DEFAULT DESCRIPTION XXXXh Reserved
MR22: Reserved
BIT 22.15:0 SYMBOL Reserved TYPE na DEFAULT DESCRIPTION XXXXh Reserved
Page: 19 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver ELECTRICAL SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS Operation above maximum rating may permanently damage the device. PARAMETER DC Supply Voltage (Vcc) Storage Temperature Pin Voltage (CMOS inputs) Pin Voltage (CMOS outputs except TXOP/N) Pin Voltage (TXOP/N only) Pin Current RECOMMENDED OPERATING CONDITIONS Unless otherwise noted, all specifications are valid over these temperatures and supply voltage ranges: PARAMETER DC Voltage Supply (Vcc) Ambient Operating Temperature (Ta) Maximum Junction Temperature Package Thermal Conductivity (ja) DC CHARATERISTICS: PARAMETER Supply Current SYMBOL ICC CONDITIONS Vcc = 3.3V; Auto-Negotiation 10BT (Idle) 10BT (Normal Activity) 100BTX Supply Current ICC Power-down mode 48 26 88 88 56 32 110 110 5 mA mA MIN NOM MAX UNIT RATING 3.3 0.3 VDC 0 to +70C 125C 45C/W RATING -0.5 to 4.0 VDC -65 to 150C -0.3 to 5.5 VDC -0.3 to (Vcc+0.6) VDC -0.3 to (Vcc+1.4) VDC 120 mA
Page: 20 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver
DIGITAL I/O CHARACTERISTICS: Pins of type CI, CIU, CID, CIO: PARAMETER Input Voltage Low Input Voltage High Input Current Pull-up Resistance Pull-down Resistance Input Capacitance Pins of type CIS: PARAMETER Low-to-High Threshold High-to-Low Threshold Input Current Input Capacitance Pins of type COZ: PARAMETER Output Voltage Low Output Voltage High Output Transition Time Tristate Output Leakage Current Pins of type CO: PARAMETER Output Voltage Low Output Voltage High Output Transition Time Pins of type CIO: PARAMETER Output Voltage Low Output Voltage High Output Transition Time SYMBOL Vol Voh Tt CONDITIONS Iol = 4mA Ioh = -4mA CL = 20pF 2.4 6 MIN NOM MAX 0.4 UNIT V V ns SYMBOL Vol Voh Tt CONDITIONS Iol = 8mA Ioh = -8mA CL = 20pF 2.4 6 MIN NOM MAX 0.4 UNIT V V ns SYMBOL Vol Voh Tt Iz CONDITIONS Iol = 4mA Ioh = -4mA CL = 20pF -1 2.4 6 1 MIN NOM MAX 0.4 UNIT V V ns A SYMBOL Vt+ VtIil, Iih Cin CONDITIONS MIN 1.3 0.80 -1 8 NOM MAX 1.7 1.20 1 UNIT V V A pF SYMBOL Vil Vih Iil, Iih Rpu Rpd Cin Type CIU only Type CID only 2.0 -1 38 38 56 56 8 CONDITIONS MIN NOM MAX 0.8 5.5 1 78 78 UNIT V V A k k pF
Page: 21 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver
DIGITAL TIMING CHARACTERISTICS RST Characteristics
VCC Oscillator RST Treset
RST Pulse Duration PARAMETER RST Pulse Assertion SYMBOL Treset CONDITIONS VCC = 3.3V and oscillator stabilized MIN 30 NOM MAX UNIT Oscillator Clock Cycles
Page: 22 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver
MII Transmit Interface CHARACTERISTICS Setup Time: TX_CLK to TXD[3:0], TX_EN, TX_ER Hold Time: TX_CLK to TXD[3:0], TX_EN, TX_ER CKIN-to-TX_CLK Delay TX_CLK Duty-Cycle SYMBOL TXSU TXHD TCKIN CONDITIONS MIN 15 0 0 40 40 60 NOM MAX UNIT ns ns ns %
TCKIN
CKIN TX_CLK TXD[3:0] TX_EN or TX_ER
TXSU TXHD
Transmit Inputs to the 78Q2120C MII Receive Interface CHARACTERISTICS Receive Output Delay: RX_CLK to RXD[3:0], RX_DV, RX_ER RX_CLK Duty-Cycle SYMBOL RXDLY CONDITIONS MIN 10 NOM MAX 30 UNIT ns
40
60
%
RX_CLK RXD[3:0] RX_DV or RX_ER
RXDLY (MAX) RXDLY
(MIN)
Receive Outputs from the 78Q2120C
Page: 23 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver
MDIO Interface Input Timing CHARACTERISTICS Setup Time: MDC to MDIO Hold Time: MDC to MDIO Max Frequency: MDC SYMBOL MIOSU MIOHD Fmax CONDITIONS MIN 10 10 25 NOM MAX UNIT ns ns MHz
MDC
MIOHD MIOSU
MDIO
MDIO as an Input to the 78Q2120C MDIO Interface Output Timing CHARACTERISTICS MDC to MDIO data delay MDIO output from high Z to driven after MDC MDIO output from driven to high Z after MDC SYMBOL MC2D MCZ2D MCD2Z CONDITIONS MIN NOM MAX 30 30 30 UNIT ns ns ns
MDC
MCZ2D
MC2D
MCD2Z
MDIO
MDIO as an Output from the 78Q2120C
Page: 24 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
Page: 25 of 35
Start of Operation Frame Code PHY Address
Turnaround
MDIO Interface Output Timing
Preamble Data
Z
Read
1
1
1
0
1
1
0
A
A
A
A
A
R
R
R
R
R
Z
0
DD
D
D
D
D
D
D
D
D
D
D
D
D
D
D
Z
(c) 2009 Teridian Semiconductor Corporation
Start of Operation Frame Code PHY Address
Turnaround
Preamble
Data
Z
Write
1
1
1
0
1
0
1
A
A
A
A
A
R
R
R
R
R
1
0
DD
D
D
D
D
D
D
D
D
D
D
D
D
D
D
Z
78Q2120C 10/100BASE-TX Transceiver
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver
100BASE-TX System Timing System timing requirements for 100BASE-TX operation are listed in Table 24-2 of Clause 24 of IEEE 802.3. PARAMETER TX_EN Sampled to first bit of "J" on MDI output First bit of "J" on MDI input to CRS assert First bit of "T" on MDI input to CRS de-assert First bit of "J" on MDI input to COL assert First bit of "T" on MDI input to COL de-assert TX_EN Sampled to CRS assert TX_EN sampled to CRS de-assert RPTR = low RPTR = low CONDITION NOM 12 16 23 20 24 6 6 UNIT BT BT BT BT BT BT BT
10BASE-T System Timing PARAMETER TX_EN (MII) to TD Delay RD to RXD at (MII) Delay Collision delay SQE test wait SQE test duration Jabber on-time* Jabber off-time* 20 250 1 1 150 750 CONDITION MIN NOM MAX 6 6 9 UNIT BT BT BT s s ms ms
* Guarantee by design. The specifications in the following table are included for information only.
Page: 26 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver
ANALOG ELECTRICAL CHARACTERISTICS 100BASE-TX Transmitter PARAMETER Peak Output Amplitude (|Vp+|, |Vp-|) (see note below) CONDITION Best-fit over 14 bit times; 0.5 dB Transformer loss Output Amplitude Symmetry Output Overshoot Rise/Fall time (tr, tf) Rise/Fall time Imbalance Duty Cycle Distortion |Vp +| |Vp -| Percent of Vp+, Vp10-90% of Vp+, Vp|tr - tf| Deviation from best-fit time-grid; 010101... Sequence Jitter Scrambled Idle 1.4 ns 3 5 5 500 250 % ns ps ps 0.98 1.02 MIN 950 NOM MAX 1050 UNIT mVpk
Note: Measured at the line side of the transformer. Test Condition: Transformer P/N: Line Termination: TLA-6T103 100 1%
100BASE-TX Transmitter (Informative) The specifications in the following table are included for information only. They are mainly a function of the external transformer and termination resistors used for measurements. PARAMETER Return Loss CONDITION 2 < f < 30 MHz 30 < f < 60 MHz 60 < f < 80 MHz Open-Circuit Inductance -8 < Iin < 8 mA MIN 16
f 16 - 20 log 30 MHz
MAX
UNIT dB
10 350 H
Page: 27 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver
100BASE-TX Receiver PARAMETER Signal Detect Assertion Threshold Signal Detect De-assertion Threshold Differential Input Resistance Jitter Tolerance (pk-pk) Baseline Wander Tracking Signal Detect Assertion Time Signal Detect De-assertion Time Not tested Not tested Not tested in production 4 -75 +75 1000 4 CONDITION MIN 500 275 NOM 600 350 20 MAX 700 425 UNIT mVppd mVppd k ns % s s
10BASE-T Transmitter The Manchester-encoded data pulses, the link pulse and the start-of-idle pulse are tested against the templates and using the procedures found in Clause 14 of IEEE 802.3. PARAMETER Peak Differential Output Signal (see note below) Harmonic Content (dB below fundamental) Link Pulse Width Start-of-Idle Pulse Width Last bit 0 Last bit 1 Note: Measured at the line side of the transformer. Test Condition: Transformer P/N: Line Termination: TLA-6T103 100 1% CONDITION All data patterns All ones data Not tested 100 300 350 ns ns ns MIN 2.2 27 NOM MAX 2.8 UNIT V dB
Page: 28 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver
10BASE-T Transmitter (Informative) The specifications in the following table are included for information only. They are mainly a function of the external transformer and termination resistors used for measurements. PARAMETER Output return loss Output Impedance Balance Peak Common-mode Output Voltage Common-mode rejection 15 Vpk, 10.1 MHz sine wave applied to transmitter commonmode. All data sequences. 15 Vpk, 10.1 MHz sine wave applied to transmitter commonmode. All data sequences. 1 MHz < freq < 20 MHz CONDITION MIN 15
f 29 - 17 log 10
NOM
MAX
UNIT dB dB
50 100
mV mV
Common-mode rejection jitter
1
ns
10BASE-T Receiver PARAMETER DLL Phase Acquisition Time Jitter Tolerance (pk-pk) Input Squelched Threshold Input Unsquelched Threshold Differential Input Resistance Bit Error Ratio Common-mode rejection Square wave 0 < f < 500 kHz Not tested 25 30 500 275 600 350 20 10-10 V 700 425 CONDITION MIN NOM 10 MAX UNIT BT ns mVppd mVppd k
Page: 29 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver
VCC C1 0.1 GND C2 0.1 GND C3 0.1 GND C4 0.1 GND VCC C7 0.01 68 ohm Impedance Traces TXEN TXCLK TXER TXD3 TXD2 TXD1 TXD0 RXCLK RXER RXD3 RXD2 RXD1 RXD0 28 27 26 32 31 30 29 24 25 19 20 21 22 TXEN TXCLK TXER TXD3 TXD2 TXD1 TXD0 RXCLK RXER RXD3 RXD2 RXD1 RXD0 C8 0.01 100 ohm Impedance Traces 61 62 52 51 50 34 33 23 40 39 38 37 49 36 48 35 CRS COL RXDV LEDL LEDTX LEDRX LEDCOL LEDFD LED100 LED10 INTERRUPT R4 49.9 1% 0603 R5 49.9 1% 0603 63 57 43 41 11 8 R2 49.9 1% 0603 R3 49.9 1% 0603 15 14 16 8 9 1 3 2 C12 0.1 100 ohm Impedance Traces 11 12 10 7 5 6 R16 75 C11 0.01 1.5KV 1808 R17 75 R18 75 R13 75
T1 TD+ TDCT TDNC1 NC2 RD+ RDCT RDTX+ TXCT TXRX+ RXCT RX-
VCC VCC VCC VCC VCC VCC
R6
100
R14 75
R15 75
J1 1 2 3 4 5 6 7 8 9 10 RJ45 CGND
TXOP TXON RXIP RXIN RPTR CRS COL RXDV LEDL LEDTX LEDRX LEDCOL LEDFDX LEDBTX LEDBT INTR
R7 R8 R9 R10 R11 R12
100 100 100 100 100 100
TLA-6T103 TDK SMT16 VCC
C6 0.1
C5 0.01
MDC MDIO R1 5.1K RESET VCC
18 17 6 7 47 44 45 46 64 2 1 12 13 14 15 16
MDC MDIO RST PWRDN ANEGA TECH2 TECH1 TECH0 PCSBP ISO ISODEF PHYAD4 PHYAD3 PHYAD2 PHYAD1 PHYAD0
VCC
1) Recommend to leave pins 56 and 56 as NC for 78Q2120C09 device. Connecting a resistor between these pins as in the 78Q2120C09 will have no effect on this device
GND
NC NC CKIN XTLP XTLN
56 54 4 59 58
Note 1
Note 2: This application circuit is only valid for the 78Q2120C09 revision. Refer to Ordering Information for revision identification.
GND Y1
GND GND GND GND GND GND GND GND
C10 39pF
25.000MHZ 50ppm GND
C9 39pF GND
C9 and C10 must be calibrated in actual application board for 25.000MHz +/-50ppm.
U1 78Q2120C09-CGT TSC LQFP64
Page: 30 of 35
60 55 53 42 10 9 5 3 GND
FIGURE 1: TYPICAL APPLICATIONS CIRCUIT
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver
ISOLATION TRANSFORMERS Two simple 1:1 isolation transformers are required at the line interface. Transformers with integrated commonmode choke are recommended for exceeding FCC requirements. This table gives the recommended line transformer characteristics: NAME Turns Ratio Open-Circuit Inductance Leakage Inductance Inter-Winding Capacitance D.C. Resistance Insertion Loss HIPOT VALUE 1 CT : 1 CT 5% 350 H (min) 0.40 H (max) 25 pF (max) 0.9 (max) 0.4 dB (typ) 1500 Vrms 0 - 65 MHz @ 10 mV, 10 kHz @ 1 MHz (min) CONDITION
Note: The 100Base-TX amplitude specifications assume a transformer loss of 0.4 dB. For the transmit line transformer with higher insertion losses, up to 1.2 dB of insertion loss can be compensated by selecting the appropriate setting in the Transmit Amplitude Selection bits in register MR19.11:10.
REFERENCE CRYSTAL If the internal crystal oscillator is to be used, a crystal with the following characteristics should be chosen: NAME Frequency Load Capacitance* Frequency Tolerance Aging Temperature Stability ( 0 - 70 C) Oscillation Mode
o o o
VALUE 25.00000 4** 50 2 5 Parallel Resonance, Fundamental Mode 50 - 100 8 10 60 > 5 dB below main within 500 kHz
UNITS MHz pF PPM PPM/yr PPM
Parameters at 25 C 2 C ; Drive Level = 0.5 mW Drive Level Shunt Capacitance (max) Motional Capacitance (min) Series Resistance (max) Spurious Response (max) W pF fF
* Equivalent differential capacitance across the XTLP/XTLN pins. ** If crystal with a larger load is used, external shunt capacitors to ground should be added to make up the equivalent capacitance difference.
Page: 31 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver
Tr CKIN
Tf
Tclkper Tclkhi
External CKIN Oscillator Characteristics
EXTERNAL CKIN OSCILLATOR CHARACTERISTICS PARAMETER CKIN Frequency CKIN Period CKIN Duty Cycle Rise / Fall Time Absolute Jitter Tr, Tf Input signaling requirements = CI SYMBOL f Tclkper CONDITION See Note 1 See Note 1 Tclkhi / Tclkper 45 MIN NOM 25.000 40 55 4.0 0.1 MAX UNIT MHz ns % ns ns
Note 1: IEEE 802.3 frequency tolerance 50 ppm
Page: 32 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver
PACKAGE PIN DESIGNATIONS
(Top View)
LEDFDX PCSBP
VCC TXON TXOP
GND XTLP XTLN
64 63 62 61 60 59 58 57 56 55
54 53 52
GND NC GND
51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
RPTR
VCC NC
RXIP RXIN
ISODEF ISO GND CKIN GND RST PWRDN VCC GND GND VCC PHYAD4 PHYAD3 PHYAD2 PHYAD1 PHYAD0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
78Q2120C
LEDBT ANEGA TECH0 TECH1 TECH2 VCC GND VCC LEDL LEDTX LEDRX LEDCOL LEDBTX INTR CRS COL
MDIO MDC RXD3
RXD2 RXD1 RXD0
RX_DV RX_CLK RX_ER
TX_ER TX_CLK TX_EN
TXD0 TXD1 TXD2
Page: 33 of 35
TXD3
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver MECHANICAL SPECIFICATIONS 64-LQFP (Top View)
11.7 (0.460) 12.3 (0.484)
11.7 (0.460) 12.3 (0.484)
PIN No. 1 Indicator 9.8 (0.386) 10.2 (0.402) 0.00 (0) 0.20 (0.008)
+
0.50 (0.0197) Typ. 0.60 (0.024) Typ.
0.14 (0.006) 0.28 (0.011)
1.40 (0.055) 1.60 (0.063)
Page: 34 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3
78Q2120C 10/100BASE-TX Transceiver ORDERING INFORMATION
PART DESCRIPTION 78Q2120C (Revision 9) 64-pin LQFP 78Q2120C (Revision 9) 64-pin LQFP - Lead Free ORDER NUMBER 78Q2120C09-64CGT 78Q2120C09-64CGT/F PACKAGE MARK 78Q2120C-CGT xxxxxxxxxxx9 78Q2120C-CGT xxxxxxxxxxx9F
REVISION HISTORY
Rev. # 1.0 1.1 1.2 1.3 Date September 2004 January 2005 August 2005 January 2009 Comments Final Data Sheet release 1. Revised ordering number (added 64) 2. Changed CKIN table title Company name and logo change Revised ordering number (deleted A)
No responsibility is assumed by Teridian Semiconductor Corporation for use of this product or for any infringements of patents and trademarks or other rights of third parties resulting from its use. No license is granted under any patents, patent rights or trademarks of Teridian Semiconductor Corporation, and the company reserves the right to make changes in specifications at any time without notice. Accordingly, the reader is cautioned to verify that the data sheet is current before placing orders.
Teridian Semiconductor Corporation, 6440 Oak Canyon Rd. Suite 100, Irvine, CA 92618 (714) 508-8800, FAX: (714) 508-8877, http://www.teridiansemiconductor.com
Page: 35 of 35
(c) 2009 Teridian Semiconductor Corporation
Rev 1.3

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