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1 features ? 8 independent receivers (rx) ? 3 independent transmitters (tx) ? full ts68k family microprocessor interface compatibility ? 16-bit data-bus ? arinc 429 interface: ?1? and ?0? lines, rz code ? support all arinc 429 data rate transfer and up to 2.5 mbit/s ? multi label capability ? parity control: odd, even, no parity, interrupt capability ? independent programmable frequency for rx and tx channels ? 8 messages fifo per tx channel ? independent interrupt request line for rx and tx functions ? vectored interrupts ? daisy chain capability ? direct addressing of all registers ? test modes capability ? 20 mhz operating frequency ? self-test capability for receiver label memories and transmit fifo ? low power: 400 mw description the ts68c429a is an arinc 429 controller. it is an enhanced version of the ef 4442 and it is designed to be connected to the new 16- or 32-bit microprocessors, espe- cially these of the atmel ts68k family. screening ? mil-std-883, class b ? desc drawing 5962-955180 ? atmel standards application note ? a detailed application note is available ?an 68c429a? on request. r suffix pga 84 ceramic pin grid array f suffix cqfp 132 ceramic quad flat pack cmos arinc 429 multichannel receiver/ transmitter (mrt) ts68c429a rev. 2120a?hirel?08/02
2 ts68c429a 2120a?hirel?08/02 hardware overview the ts68c429a is a high performance arinc 429 controller designed to interface pri- mary to the atmel ts68k family microprocessor in a straight forward fashion (see ?application notes? on page 33). it can be connected to any ts68k processor family with an asynchronous bus with some additional logic in some cases. as shown in figure 1, the ts68c429a is divided into five main blocks, the microproces- sor interface unit (miu), the logical control unit (lcu), the interrupt control unit (icu), the receiver channel unit (rcu) and the transmitter channel unit (tcu). ? the miu handles the interface protocol of the host processor. through this unit, the host sees the ts68c429a as a set of registers. ? the lcu controls the internal data flow and initializes the ts68c429a. ? the icu manages one interrupt line for the rcu and one for the tcu. each of these two parts has a daisy chain capability. all channels have a dedicated vectored interrupt answer. receiver channels priority is programmable. ? the rcu is composed of 8 arinc receiver channels made of: ? a serial to parallel converter to translate the two serial signals (the ?1? and ?0? in rz code) into two 16-bit words, ? a memory to store the valid labels, ? a control logic to check the validity of the received message, ? a buffer to keep the last valid received message. ? the tcu is composed of three arinc transmitter channels made of: ? a parallel to serial converter to translate the messages into two serial signals (the ?1? and ?0? in rz code), ? a fifo memory to store eight 32-bit arinc messages, ? a control logic to synchronize the message transmitter (parity, gap, speed, etc.). ? test facility: rx inputs can be internally connected to tx3 output. ? self-test facility: the receiver contro l label matrix and transmitter fifo can be tested. this self-test can be used to verify the integrity of the ts68c429a memories.
3 ts68c429a 2120a?hirel?08/02 figure 1. simplified block diagram
4 ts68c429a 2120a?hirel?08/02 package see ?package mechanical data? on page 40 and ?terminal connections? on page 41. figure 1. signal description pin name type function a0-8 i address bus. the address bus is used to select one of the internal registers during a processor read or write cycle. d0-15 i/o this bi-directional bus is used to receive data from or transmit data to an internal register during a processor read or write cycle. during an interrupt acknowledge cycle, the vector number is given on the lower data bus (d0 - d7). cs i chip select (active low). this input is used to select the chip for internal register access. lds i lower data strobe. this input (active low) validates lower data during r/w access (d0-d7). uds i upper data strobe. this input (active low) validates upper data during r/w access (d8-d15). r/w i read/write. this input defines a data transfer as a read (high) or a write (low) cycle. dtack o data transfer acknowledge. if the bus cycle is a processor read, the chip asserts dtack to indicate that the information on the data bus is valid. if the bus cycle is a processor write, dtack acknowledges the acceptance of the data by the mrt. dtack will be asserted during chip select access (cs asserted) or interrupt acknowledge cycle (iacktx or iackrk asserted). irqtx o interrupt transmit request. this open drain output signals to the processor that an interrupt is pending from the transmission part of the mrt. there are 6 causes that can generate an interrupt request (2 per channel: fifo empty and end of transmission). iacktx i interrupt transmit acknowledge. if irqtx is active, the mrt will begin an interrupt acknowledge cycle. the mrt will generate a vector number to the processor which is the highest priority channel requesting interrupt service. ieitx i interrupt transmit enable in. this input, together with ieotx signal, provides a daisy chained interrupt structure for a vectored scheme. ieitx (active low) indicates that no higher priority device is requesting interrupt service. ieotx o interrupt transmit enable out. this output, together with ieitx signal, provides a daisy chained interrupt structure for a vectored interrupt scheme. ieotx (active low) indicates to lower priority devices that neither the ts68c429a nor any highest priority peripheral is requesting an interrupt. irqrx o interrupt transmit request. this open drain output signals to the processor that an interrupt is pending from the receiving part of the chip. there are 9 causes that can generate an interrupt request (1 per channel: valid message received, and 1 for bad parity on a received message). iackrx i interrupt receive acknowledge. same function as iacktx but for receiver part. ieirx i interrupt receive enable in. same function as ieitx but for receiver part. ieorx i interrupt receive enable out. same function as ieotx but for receiver part. tx1h o transmission ?1? line of the channel 1. tx1l o transmission ?0? line of the channel 1. tx2h o transmission ?1? line of the channel 2. tx2l o transmission ?0? line of the channel 2. tx3h o transmission ?1? line of the channel 3. tx3l o transmission ?0? line of the channel 3. rx1h i receiving ?1? line of the channel 1. rx1l i receiving ?0? line of the channel 1. rx2h i receiving ?1? line of the channel 2
5 ts68c429a 2120a?hirel?08/02 rx2l i receiving ?0? line of the channel 2. rx3h i receiving ?1? line of the channel 3. rx3l i receiving ?0? line of the channel 3. rx4h i receiving ?1? line of the channel 4. rx4l i receiving ?0? line of the channel 4. rx5h i receiving ?1? line of the channel 5. rx5l i receiving ?0? line of the channel 5. rx6h i receiving ?1? line of the channel 6. rx6l i receiving ?0? line of the channel 6. rx7h i receiving ?1? line of the channel 7. rx7l i receiving ?0? line of the channel 7. rx8h i receiving ?1? line of the channel 8. rx8l i receiving ?0? line of the channel 8. reset i this input (active low) will initialize the ts68c429a registers. v cc /gnd i these inputs supply power to the chip. the v cc is powered at +5 volts and gnd is the ground connection. clk-sys i the clock input is a single-phase signal used for internal timing of processor interface. clk-arinc i this input provides the timing clock to synchronize received/transmitted messaged. figure 1. signal description (continued) pin name type function
6 ts68c429a 2120a?hirel?08/02 figure 2 illustrates the functional signal groups. figure 2. functional signal groups diagram scope this drawing describes the specified requirements for the arinc multi channel receiver/transmitter, in compliance either with mil-std-863 class b or smd drawing. applicable documents mil-std-883 1. mil-std-883: test methods and procedures for electronics 2. mil-std-38535: general specifications for microcircuits. 3. mil-std-1835 microcircuit case outlines. 4. desc/smd. requirements general the microcircuits are in accordance with the applicable document and as specified herein.
7 ts68c429a 2120a?hirel?08/02 design and construction terminal connections depending on the package, the terminal connec tions is detailed in ?terminal connec- tions? on page 41. package the circuits are packaged in a hermetically sealed ceramic package which is conform to case outlines of mil-std 1835 (when defined): ? pga 84, ? cqfp 132. the precise case outlines are described at the end of this specification (?package mechanical data? on page 40) and into mil-std-1835. special recommended conditions for cmos devices ? cmos latch-up the cmos cell is basically composed of two complementary transistors (a p-channel and an n-channel), and, in the steady state, only one transistor is turned-on. the active p-channel transistor sources current when the output is a logic high and presents a high impedance when the output is a logic low. thus the overall result is extremely low power consumption because there is no power loss through the active p-channel transistor. also since only once transistor is determined by leakage currents. because the basic cmos cell is composed of two complementary transistors, a para- sitic semiconductor controlled rectifier (scr) formed and may be triggered when an input exceeds the supply voltage. the scr that is formed by this high input causes the device to become ?latched? in a mode that may result in excessive current drain and eventual destruction of the device. altho ugh the device is implemented with input pro- tection diodes, care should be exercised to ensure that the maximum input voltages specification is not exceeded from voltage transients; others may require no additional circuitry. ? cmos/ttl levels the ts68c429a doesn?t satisfy totally the input/output drive requirements of ttl logic devices, see table 4. electrical characteristics table 1. absolute maximum ratings symbol parameter test conditions min max unit v cc supply voltage -0.3 +7.0 v v i input voltage -0.3 +7.0 v p dmax max power dissipation 400 mw t case operating temperature m suffix -55 +125 c v suffix -40 +85 c t stg storage temperature -55 +150 c t j junction temperature +160 c t leads lead temperature max 5 sec. soldering +270 c
8 ts68c429a 2120a?hirel?08/02 this device contains protective circuitry against damage due to high static voltages or electrical fields: however, it is advised that normal precautions be taken to avoid applica- tion of any voltages higher than maximum-rated voltages to this high-impedance circuit. reliability of operation is enhanced if unused inputs are tied to an appropriate logic volt- age level (e.g., either gnd or vcc). figure 3. clock input timing diagram note: timing measurements are referenced to and from a low of 0.8-volt and a high voltage of 2.25 volts, unless otherwise noted. the voltage swing through this range should start outside and pass through the range such that the rise or fall will be linear between 0.8-volt and 2.25 volts. unless otherwise stated, all voltages are referenced to the reference terminal. table 2. recommended condition of use symbol parameter test conditions min max units v cc supply voltage 4.5 5.5 v v il low level input voltage -0.5 0.8 v v ih high level input voltage 2.25 5.8 v t case operating temperature m suffix -55 +125 c v suffix -40 +85 c c l output loading capacitance 130 pf t r (c) clock rise time (see figure 3) 5 ns t f (c) clock fall time (see figure 3) 5 ns f c clock system frequency (see figure 3) 0.5 20 mhz table 3. thermal characteristics package symbol parameter value unit pga 68 j-a thermal resistance junction-to-ambient 28 c/w j-c thermal resistance junction-to-case 2 c/w cqfp 132 j-a thermal resistance junction-to-ambient 27 c/w j-c thermal resistance junction-to-case 3 c/w 0.8v 2.25v t cyc t cl t ch t cf t cr
9 ts68c429a 2120a?hirel?08/02 power considerations the average chip-junction temperature, t j , in c can be obtained from: t j = t a + (p d ? ja )(1) t a = ambient temperature, c ja = package thermal resistance, junction-to-ambient, c/w p d = p int + p i/o p int = i cc x v cc , watts?chip internal power p i/o = power dissipation on input and output pins?user determined for most applications p i/o < p int and can be neglected. an approximate relationship between p d and t j (if p i/o is neglected) is: p d = k: (t j + 273) (2) solving equations (1) and (2) for k gives: k = p d ? (t a + 273) + ja ? p d 2 (3) where k is a constant pertaining to the particular part k can be determined from equa- tion (3) by measuring p d (at equilibrium) for a known t a . using this value of k, the values of p d and t j can be obtained by solving equations (1) and (2) iteratively for any value of t a . the total thermal resistance of a package ( ja ) can be separated into two components, jc and ca , representing the barrier to heat flow from the semiconductor junction to the package (case), surface ( jc ) and from the case to the outside ambient ( ca ). these terms are related by the equation: ja = jc + ca (4) jc is device related and cannot be influenced by the user. however, ca is user depen- dent and can be minimized by such therma l management techniques as heat sinks, ambient air cooling and thermal convection. thus, good thermal management on the part of the user can significantly reduce ca so that ja approximately equals jc . substi- tution of jc for ja in equation (1) will result in a lower semiconductor junction temperature. mechanical and environment the microcircuits shall meet all mechanica l environmental requirements of either mil- std-883 for class b devices or desc devices. marking the document where are defined the marking are identified in the related reference doc- uments. each microcircuit are legibly and permanently marked with the following information as minimum: ?atmel logo ? manufacturer?s part number ? class b identification ? date-code of inspection lot ? esd identifier if available ? country of manufacturing
10 ts68c429a 2120a?hirel?08/02 quality conformance inspection desc/mil-std-883 is in accordance with mil-m-38510 and method 5005 of mil-std-883. group a and b inspections are performed on each production lot. group c and d inspections are per- formed on a periodic basis. electrical characteristics general requirements all static and dynamic electrical characteristics specified for inspection purposes and the relevant measurement conditions are given below: ? table 4, table 5: static electrical characteristics for the electrical variants. ? table 6, table 7, table 8: dynamic electrical characteristics. for static characteristics (table 4, table 5), test methods refer to iec 748-2 method number, where existing. for dynamic characteristics (table 6, table 7, table 8), test methods refer to clause 5.5 of this specification. note: 1. idd is measured with all i/o pins at 0v, all input pins at 0v except signals cs , iackxx , lds , uds at 5v and clk-sys and clk-arinc which run at t cyc mini. table 4. dc electrical characteristics with -55 c t case +125 c or -40 t case +85 c; v cc = 5v 10%. symbol parameter min max unit v ih input high voltage 2.25 v cc + 0.3 v v il input low voltage -0.5 0.8 v v oh output high voltage (except irqrx , irqtx : open drain outputs) 2.7 v v ol output low voltage 0.5 v i oh output source current (except irqrx , irqtx : open drain outputs) (v out = 2.7v) -8 ma i ol output sink current (v out = 0.5v) 8 ma i li input leakage current (v in = 0 to v cc ) 20 a idd dynamic current (1) (t case = t min ? v dd = v max ) 65 ma table 5. capacitance (t a = 25 c) symbol parameter max unit c in input capacitance 10 pf c out hi-z output capacitance 20 pf
11 ts68c429a 2120a?hirel?08/02 clock timing note: 1. t cyc a 4 x t cyc s. ac electrical characteristics with v cc = 5 v dc 10% v ss = 0 v dc . ieixx , ieoxx , iackxx , must be understood as generic signals (xx = rx and tx). figure 4. read cycle notes: 1. lds /uds can be asserted on the next or previous clk-sys period after cs goes low but (4) must be met for the next period. 2. the cycle ends when the first of cs , lds /uds goes high. table 6. clock system (clk sys) symbol parameter min max unit t cyc s clock period 50 2000 ns t cls , t chs clock pulse width 20 ns t crs , t cfs rise and fall times 5 ns table 7. clock arinc (clk arinc) symbol parameter min max unit t cyc acycle time (1) 200 8000 ns t cla , t cha clock pulse width 240 ns t cra , t cfa rise and fall times 5 ns
12 ts68c429a 2120a?hirel?08/02 figure 5. write cycle 3. lds /uds can be asserted on the same or previous clk-sys period as cs but (3) and (4) must be met. figure 6. interrupt cycle (ieixx = 0) notes: 1. if uds = 1, d15-d8 stay hi-z else d15-d8 drive the bus with a stable unknown value. 2. if ieoxx goes low, neither vector nor dtack are generated, else ieoxx stays inactive and a vector is generated (d7-d0 and dtack ).
13 ts68c429a 2120a?hirel?08/02 figure 7. interrupt cycle (ieixx = 1) notes: 1. if uds = 1, d15-d8 stay hi-z else d15-d8 drive the bus with a stable unknown value. 2. if ieoxx goes low, neither vector nor dtack are generated, else ieoxx stays inactive and a vector is generated (d7-d0 and dtack ). table 8. timing characteristic number symbol parameter min max t/g (1) unit 1t avcsl address valid to cs low 0 - t ns 2t rwvcsl r/w valid to cs low 0 - t ns 3t divdsl data in valid to lds /uds low 0 - t ns 4t svcl cs, lds /uds , iackxx valid to clk-sys low 5 - t ns 5t cldkl clk-sys low to dtack low - 45 t ns 6t cldov clk-sys low to data out valid - 50 t ns 7t dkldov dtack low to data out valid - 10 g ns 8t shdkh cs or lds /uds or iackxx high to dtack high - 35 g ns 9t shdxz cs or lds /uds or iackxx high to dtack hi-z - 50 g ns 10 t shdoz cs or lds /uds or iackxx high to data out hi-z - 25 g ns 11 t iliol ieixx or iackxx low to ieoxx low - 35 t ns 12 t ikhioh iackxx high to ieoxx high - 40 t ns 13 t iildkl ieixx low to dtack low - 40 t ns 14 t iildov ieixx low to data out valid - 45 t ns 15 t sh cs , iackxx , lds /uds inactive time 15 - t ns 16 t dklsh dtack low to cs or lds /uds or iackxx high 0 - g ns 17 t shah cs or lds /uds high to address hold time 0 - g ns
14 ts68c429a 2120a?hirel?08/02 note: 1. t/g = tested/guaranteed. functional description receiver channel unit (rcu) overview the rcu is composed of 8 arinc receiver channels and has per channel: ? a serial to parallel converter to translate the two serial signals in two 16-bit words. ? a memory to store the authorized labels, ? a control logic to check the validity of the received message. ? a buffer to keep the last valid received message. inputs each receiver channel has two input lines, receiving line high (rxih) and receiving line low (rxil) which are not directly compatible with the bipolar modulated arinc line. this arinc three-level state signals (?high?, ?null?, ?low?) should be demultiplexed to generate the two rz lines according to figure 8. figure 8. description each channel has a test mode in which the input signals (rxih, rxil), are internally connected to the third transmit channel lines. this selection is done by programming the test bit in the receiver control register (see ?register description? on page 17) except this difference, the ts68c429a behaves exactly the same manner in the two modes. the receiver channel block diagram is given in figure 9. arinc signals being asynchronous, the rcu first rebuilds the received clock in order to transfer the data within the shift-register and when the gap-controller has detected the end of the message, tests the message validity according to the criteria listed hereafter. 18 t shrwi cs or lds /uds high to r/w invalid 0 - g ns 19 t dkldih dtack low to data in hold time 0 - g ns 20 t shdoh cs or lds /uds or iackxx high data out hold time 0-gns table 8. timing characteristic (continued) number symbol parameter min max t/g (1) unit
15 ts68c429a 2120a?hirel?08/02 to detect the end of the message, the gap-controller waits for a gap after the last received bit. to do so, at each clk arinc cycle, a counter is incremented and com- pared to the content of the gap-register which has the user programmed value. if both values are equal, the counter is stopped and an internal end of message signal is gener- ated. this counter is reseted on the falling edge of the rebuilt clock. figure 9 shows the gap detection principle. when the end of message is detected, the ts68c429a verifies the following points: ? the number of received bits must be 32, ? if requested the message parity (see ?register description? on page 17) is compared to the parity bit of the message, ? the message label must be equal to one of the label stored in the label control matrix, ? the buffer is empty (that is: the last message has been read). the corresponding bit in the status-register (see logical interface unit), has been cleared, ? when all four conditions are met, the message is transferred from the shift-register to the buffer and the corresponding bit is set in the status-register. if the interrupt mode is enabled (see ?general circuit control? on page 24) the irqrx line is activated. if not, reception of a new message is enabled, see note. if only the message parity is incorrect, an interrupt can be generated (see ?register description? on page 17). the buffer is seen as two 16-bit word registers, the most significant word of the mes- sage (msw) is contained in the lower addre ss, the less significant word of the message (lsw) is contained in the upper address. the msw should be read first because reading the lsw will release the buffer and allow transfer of a new message from the shift-register.
16 ts68c429a 2120a?hirel?08/02 figure 9. receiver channel block diagram note: a valid message is stored in the shift-reg. until a new message arrives and so may be transferred to the message buffer as soon as the buffer is ?freed?.
17 ts68c429a 2120a?hirel?08/02 figure 10. register description four registers are associated to each receiver channel. these four registers are: a) receiver control b) gap register c) message buffer d) label control matrix ? register control register this read/write register controls the function of the related receiver channel: end of msg synchro counter gap register clk-arinc rebuilt clock
18 ts68c429a 2120a?hirel?08/02 the lowest value will give the highest priority. if two channels have the same priority, one of them will never be able to send its interrupt vector to the microprocessor. each channel must have a unique channel priority order. figure 11. 151413121110987654321 0 channel enable test mode label control label control matrix write enable parity control not used wrong parity not used channel priority order usd access lds access table 9. register control register description bit function comments bit 15 channel enable 0: channel is out of service 1: channel is in service bit 14 test mode 0: external arinc lines as input (normal operation) 1: third transmitter lines as input (test mode) bit 13 label control 0: no control, all the labels are accepted 1: automatic check of the label according to the label control matrix bit 12 lcmwe label control matrix write enable 0: receiving mode (write to the matrix are disabled) 1: programmation mode for labels control matrix bit 11 parity control 0: even parity check 1: odd parity check bit 10 parity control 0: parity check is disable 1: parity check is enable bit 9 not used bit 8 not used bit 7 wrong parity: this feature is enabled only if the self-test register bit 0 is set 1 0: received message parity is correct if read, reset wrong wrong parity flag if written. 1: an incorrect received message parity has been detected (the corresponding message is lost) (set by hardware). bit 6 not used
19 ts68c429a 2120a?hirel?08/02 ? gap register (figure 12) the gap register is accessible for writing operations only. it contains the value on which the gap counter will be stopped and will generate the end of the message signal (see ?inputs? on page 14). the value is interpreted as a multiple of the clk arinc period. figure 12. gap register description the value of the gap register must be chosen so as to generate the end of the message before the minimal gap as defined in the arinc-429 norm. ? message buffer the buffer is made of two 16-bit registers, the most significant word of the message (msw) is contained in the lower address register, the least significant word of the mes- sage (lsw) is contained in the upper address register. for correct behavior, the msw must be read before the lsw. they are accessible in read mode only and 16-bit access is mandatory. ? label control matrix the label control matrix is a 256 x 1 bit memory. there is one memory per channel. the address is driven by the incoming label, the output data is used to validate this incoming message label (see figure 13). to program this matrix, the lcmwe (label control matrix write enable) bit of the receiver-control-register should be set to ?1? to allow the access. at this time, the address is driven by the external address bus and the data are written from the data bus d7 to d0 (one per channel according to figure 14). any write to a matrix on which the lcmwe is not set will not have any effect. the label control matrix can be written or read in byte and word mode. in word mode, the state of d15-d8 is unknown. after complete programming of the matrix, the lcmwe bit should be reset to ?0? to allow normal receiving mode. a ?1? in the memory means that this label is allowed and a ?0? means that this label must be ignored. bit 5 not used bit 4 not used bit 0 to 3 channel priority: order the lowest value will give the highest priority. each channel must have a unique channel priority order. if several messages are pending, the interrupt vector will account for highest priority channel. table 9. register control register description bit function comments
20 ts68c429a 2120a?hirel?08/02 figure 13. label control matrix figure 14. transmitter channel unit (tcu) overview the tcu is composed of three arinc transmit channels and has per channel: ? a parallel to serial converter to translate the messages into two serial signals, ? a fifo memory to store eight 32-bit arinc messages, ? a control logic to synchronize the message transmitter (parity, gap, speed...). outputs each transmitter channel has two output lines, transmit line high (txih) and transmit line low (txil) which are not directly compatible with the bipolar modulated arinc line. these rz format lines should be translated by an outside device into arinc three-level state signal according to figure 15.
21 ts68c429a 2120a?hirel?08/02 figure 15. transmitter channel unit outputs description the block diagram of a transmit channel is given is given in figure 16. only the third channel can be switched to internal lines for test mode, otherwise the channels are iden- tical. the selection of this test mode is done by programming the test bit in the transmitter-control-register (see ?register description? on page 17). in this test mode the lines tx3h and tx3l are not driven, they are both kept at ?0?. the transmit frequency is generated by divi ding the arinc clock signal (clk arinc) by the value contained in the frequency register. this divided clock synchronizes the shift register which sends the 32-bit word on the lines txih and txil. the parity is computed and if requested (see ?register description? on page 17) the par- ity bit (32nd bit of the message) is modified to have an odd number of ?1? in the 32-bit message for odd parity or an even number of ?1? in the 32-bit message for even parity. a gap control block generates a gap between the sent messages. the value of this gap is defined by the 5 bits ?transmission gap? of the transmitter-control-register, it is given in number of arinc bit (see ?register description? on page 17). a fifo control block manages the messages to be sent. up to 8 messages can be writ- ten into the fifo. the fifo is seen as a two 16-bit memory words, the most significant word of the message (msw) is written in the lower address, the least significant word of the message (lsw) is written in the upper address. the msw should be written first. the access to the fifo is 16 bits mandatory. the number of messages within the fifo is indicated by a counter that can be read through the transmitter-control-register. this counter is incremented when the lsw is written and decremented when the message is transferred to the shift-register. the ?reset fifo? bit is used to cancel messages within the fifo. if a transmission is on going, the entire message will be sent. the ?reset fifo? bit remains active until written at 1 by the microprocessor. when the transmitter is disable during a transmission, the out going message is lost. when the fifo is empty, a bit is set in the status-register (see ?general circuit control? on page 24). if the interrupt mode is enabled (see ?general circuit control? on page 24) the irqtx line is activated. when the transmitter fifo is empty and when no transmission is on going, the first write access to the fifo has to be preceded by the following sequence: disable and enable transmission (see figure 36: first fifo access).
22 ts68c429a 2120a?hirel?08/02 figure 16. transmitter channel block diagram register description three registers are associated to each transmitter channel: ? the frequency register, ? the transmitter control register, ? the fifo. ? the frequency register the frequency register is only accessible for writing operations by the user and contains the frequency divider. figure 17. frequency register
23 ts68c429a 2120a?hirel?08/02 the transmission frequency can be computed by dividing the clk arinc frequency by the frequency register value. the frequency register must be loaded with a value greater or equal to 2. ? the transmitter control register the transmitter control register is accessible for reading and writing operations. figure 18. transmitter control register table 10. transmission control register description bit function comments bit 15 enable transmission - 0: channel out of service (stops on going transmission) - 1: channel in service - 1 to 0: transition is not allowed at the same time as an 1 to 0 transition of the bit 4 - when the transmitter fifo is empty and when no transmission is on going, the first write access to the fifo has to be preceded by the following sequence: reset to 0 and then set to 1 bit 14 test (only 3rd channel) 0: normal operating 1: test, output are only driven on internal lines for input testing bit 13 to 12 not used bus 11 parity control 0: even parity calculation 1: odd parity calculation bit 10 parity control 0: parity disable, bit 32 of the message stays unchanged 1: parity enable. bit 32 of the message will be forced by parity control bit 9 to 5 transmission gap ?transmission gap? which is the delay between two 32-bit arinc messages (in arinc bit) bit 4 reset fifo - write a 0 in this bit reset the fifo counter - this bit must be set to 1 before any write in the transmit buffer. - 1 to 0: transition is not allowed at the same time as an 1 to 0 transition of the bit 15 bit 3 to 0 number of msg these four bits indicate the available space within the fifo
24 ts68c429a 2120a?hirel?08/02 ? fifo the fifo is seen as two 16-bit words. the most significant word (msw) must be writ- ten first. the least significant word (lsw) write increments the fifo counter. before any write, the user should verify that the fifo is not full. if the fifo is full, any write to the fifo will be lost. general circuit control logical control unit (lcu) the lcu mainly distributes the clocks and reset within the mrt. the reset signal, active low is an asynchronous signal. when it occurs, all registers are reset to zero except the label-control-matrix which is not initialized and the status-register which is set to fc00 (hex). reset duration must be greater than 4 clk-cyc periods. the lcu contains the status-register. this read/write register indicates the state of the internal operations. it is also the image of the pending interrupts if they are not masked. clearing a bit ?rx-channel-i? will cancel the received message and release the mes- sage-buffer for reception of a new message. the ?end of tx on channel-i? is set only when the involved channel fifo is empty. the format of the status-register is given below. figure 19. status register
25 ts68c429a 2120a?hirel?08/02 microprocessor interface unit (miu) this interface which is directly compatible with the atmel ts68k family is based on an asynchronous data transfer. the data exchange is mandatory on 16 bits for access to the fifo messages (transmit- ter) and to the message buffer (receiver). for other access it can be on byte on d0-d7 with lds assertion or an d8-d15 with uds assertion. figure 20 and figure 21 show the read and write flow chart. figure 20. read cycle flow chart table 11. description of lcu status register bit function comments bit 15, 13, 11 fifo channel 3, 2, 1 empty 0: fifo not empty 1: fifo empty bit 14, 12, 10 end of transmission on channel 3, 2, 1 0: transmission occurs 1: no transmission actually bit 8 rx wrong parity. this feature is available only if self-test register bit 0 is set to 1. this bit must be reset to 0 by user when needed. 0: no wrong parity received 1: at least one receiver has received a message with wrong parity (set by hardware). bit 7, 6, 5, 4, 3, 2, 1, 0 receiving channel 8, 7, 6, 5, 4, 3, 2, 1 0: waiting for message 1: received correct message
26 ts68c429a 2120a?hirel?08/02 figure 21. write cycle flow chart interrupt control unit (icu) ? daisy chain the icu is composed of 2 interrupt blocks with a daisy chain capability (transmitter and receiver blocks). the daisy chain allows more than one circuit to be connected on the same interrupt line. figure 22 shows the use of a daisy chain. irqxx, iackxx, ieixx, ieoxx must be understood as generic signals. they are irqtx, iacktx, ieitx, ieotx for the transmitter block and irqrx, iackrx, ieirx, ieorx for the receiver block. if ieixx = 0, no higher device have an interrupt pending on the same line so the interrupt is requested and the ieoxx is forced high to disable lowest devices to generate inter- rupt. if ieixx = 1, it waits for the condition ieixx = 0. when ieixx is tied high, ieoxx is forced high. the daisy chains can be used to program a priority between receivers and transmitters interrupts when only one interrupt level is needed. an example is given in ?microproces- sor interface? on page 33.
27 ts68c429a 2120a?hirel?08/02 figure 22. interrupt control unit daisy chain use ? vectored interrupt they are 15 possibilities to generate an inte rrupt and two lines to handle them. to be more efficient, a unique vector number for each cause is given to the microprocessor as an answer to an irq. figure 23 shows the interrupt acknowledge sequence flow chart. figure 23. interrupt acknowledge sequence flow chart
28 ts68c429a 2120a?hirel?08/02 ? register description any internal status change that induces a bit to be set in the status-register will generate an interrupt if this cause is enabled by the mask-register and if no highest priority cause is already activated or pending. for the receiver blocks, the priority is programmable (see interrupt vector number description). for the transmitter block, the end-of-transmission has higher priority than fifo-empty and channel 1 has higher priority than channel 2 that has higher priority than channel 3. the rx wrong parity bit can be set only if self-test register bit 0 is set to 1. the user has to check which receiver has it receiver control register bit 7 set to 1. at the end of the interrupt procedure, the user must reset rx wrong parity bit to 0. rx wrong parity is the highest interrupt priority source for the receiver part of the mrt. ? the mask register the mask register is accessible for reading and writing operations. the mask register is used to disable interrupt source. the bit order is the same as in the status register. a ?0? indicates that this source is disable, a ?1? enables an interrupt for this source. figure 24. mask register ? the base register the base register is only accessible for writing operations by the user. the base register must be programmed at the initialization phase. it contains the base for the vector gen- eration during an interrupt acknowledge. this allows the use of several peripherals. if not programmed interrupt vector is set to $of.
29 ts68c429a 2120a?hirel?08/02 figure 25. base register ? the interrupt vector number during an interrupt acknowledge cycle, an 8-bit vector number is presented to the micro- processor on d0-d7 lines. this vector number corresponds to the interrupt source requesting service. the format of this number is given below. figure 26. self-test description a self-test has been implemented for the receiver control label matrix ram and the transmitter fifo. this test can be used to guarantee the good behavior of the different mrt?s memories.
30 ts68c429a 2120a?hirel?08/02 register description figure 27. self-test register the self-test register can be split in three parts: 1. bit 0: used to enable receiver wrong parity detection. this bit has been imple- mented to guarantee compatibility with previous designs: 0: receiver wrong parity detection disable, 1: receiver wrong parity detection enable. 2. self-test command: bit 5: receiver test clock mode: 0: if clk-sys is less or equal to 10 mhz, 1: if clk-sys is higher than 10 mhz. bit 6: start transmitter self-test if a 0 to 1 transition is programmed (before a new self-test, the user must reprogram this bit to 0). bit 7: start receiver label control matrix self-test if a 0 to 1 transition is programmed (before a new self-test, the user must reprogram this bit to 0). 3. self-test result: bit 8: 0: transmitter 1 self-test is running, 1: end of transmitter 1 self-test. bit 9: 0: transmitter 2 self-test is running, 1: end of transmitter 2 self-test. bit 10: 0: transmitter 3 self-test is running, 1: end of transmitter 3 self-test. bit 11: result of transmitter 1 self-test: 0: (if bit 8 is set to 1) self-test pass, 1: self-test fail. bit 12: request of transmitter 2 self-test: 0: (if bit 9 is set to 1) self-test pass,
31 ts68c429a 2120a?hirel?08/02 1: self-test fail. bit 13: result of transmitter 3 self-test: 0: (if bit 10 is set to 1) self-test pass, 1: self-test fail. bit 14: 0: receiver label control matrix self-test is running, 1: end of receiver label control matrix self-test. bit 15: result of receiver lcm self-test: 0: (if bit 14 is set to 1) self-test pass, 1: self-test fail. self-test use the self-test destroys the content of the tested memory. so, it could be used after sys- tem reset, during system initialization. only one self-test (transmitters and receivers) can be performed after a reset. if the self-test must be restarted, the reset must be acti- vated (then released) before the new self-test start. to program the self-test: 1. if the receiver self-test will be used: set to 1 lcmwe bits (for all receivers). 2. if receiver self-test will be used and clk-sys is > 10 mhz: set to self-test register bit 5. 3. start self-test: set to 1 self-test register bit 6 for transmitter test, set to 1 self-test register bit 7 for receiver ram test. at this point, self-test is running. the test duration is: 710 clk-sys periods for transmitter self-test, 2820 clk-sys periods for receiver ram test if self-test register bit 5 is 0, 5640 clk-sys periods for receiver ram test if self-test register bit 5 is 1. to read the self-test result, the user must: 1. poll the self-test register and wait for an end of test set to 1 (bits 8 to 10, bit 14) then, 2. read the self-test register again to have a valid result on bits 11, 12, 13, 15 according to the tests which end at point 1. memory map address access register 0h 1h 2h 3h r/w w r r receiver-control-register gap-register message-buffer msw message-buffer lsw receiving channel 1 4h 5h 6h 7h r/w w r r receiver-control-register gap-register message-buffer msw message-buffer lsw receiving channel 2
32 ts68c429a 2120a?hirel?08/02 mrt address 2ch to 3fh and 44h to ffh do not generate dtack signal (illegal address). 8h 9h ah bh r/w w r r receiver-control-register gap-register message-buffer msw message-buffer lsw receiving channel 3 ch dh eh fh r/w w r r receiver-control-register gap-register message-buffer msw message-buffer lsw receiving channel 4 10h 11h 12h 13h r/w w r r receiver-control-register gap-register message-buffer msw message-buffer lsw receiving channel 5 14h 15h 16h 17h r/w w r r receiver-control-register gap-register message-buffer msw message-buffer lsw receiving channel 6 18h 19h 1ah 1bh r/w w r r receiver-control-register gap-register message-buffer msw message-buffer lsw receiving channel 7 1ch 1dh 1eh 1fh r/w w r r receiver-control-register gap-register message-buffer msw message-buffer lsw receiving channel 8 20h 21h 22h 23h r/w w w w transmit-control-register frequency-register message-fifo msw message-fifo lsw transmission channel 1 24h 25h 26h 27h r/w w w w transmit-control-register frequency-register message-fifo msw message-fifo lsw transmission channel 2 28h 29h 2ah 2bh r/w w w w transmit-control-register frequency-register message-fifo msw message-fifo lsw transmission channel 3 40h r/w status-register 41h 42h 43h r/w w r/w mask-register base-register self-test register 100h to 1ffh r/w label-control-matrix receiving channels 1-8 memory map (continued) address access register
33 ts68c429a 2120a?hirel?08/02 application notes (for additional details order the an 68c429a) microprocessor interface figure 28. typical interface with ts68000 (*) this kind of application can also work with an independant clk
34 ts68c429a 2120a?hirel?08/02 figure 29. typical interface with 68020/cpu 32 core microcontrollers
35 ts68c429a 2120a?hirel?08/02 figure 30. typical interface with 68302 in this example, receiver interrupts have a higher priority than transmitter interrupts.
36 ts68c429a 2120a?hirel?08/02 programs flow-chart figure 31. initialization after reset flow-chart
37 ts68c429a 2120a?hirel?08/02 figure 32. receiver without interrupt flow-chart figure 33. receiver with interrupt flow-chart it start read "msw" read "lsw" it end
38 ts68c429a 2120a?hirel?08/02 figure 34. transmitter without interrupt flow-chart figure 35. transmitter with interrupt flow-chart
39 ts68c429a 2120a?hirel?08/02 figure 36. first fifo access preparation for delivery packaging microcircuits are prepared for delivery in accordance with mil-i-38535 or desc. certificate of compliance atmel offers a certificate of compliance with each shipment of parts, affirming the prod- ucts are in compliance either with mil-std-883 or desc and guaranteeing the parameters not tested at temperature extremes for the entire temperature range. handling mos devices must be handled with certain pr ecautions to avoid damage due to accu- mulation of static charge. input protection devices have been designed in the chip to minimize the effect of this static buildup. however, the following handling practices are recommended: ? devices should be handled on benches with conductive and grounded surfaces. ? ground test equipment, tools and operator. ? do not handle devices by the leads. ? store devices in conductive foam or carriers. ? avoid use of plastic, rubber, or silk in mos areas. ? maintain relative humidity above 50 percent if practical.
40 ts68c429a 2120a?hirel?08/02 package mechanical data pga 84 cqfp 132
41 ts68c429a 2120a?hirel?08/02 terminal connections 84-lead pga assignment 132-lead cqfp assignment
42 ts68c429a 2120a?hirel?08/02 ordering information standard product atmel part number norms package temperature range tc ( c) detailed qualification ts68c429amr atmel standard 84-lead pga -55/+125 atmel internal ts68c429amf atmel standard 132-lead cqfp -55/+125 atmel internal ts68c429avr atmel standard 84-lead pga -40/+85 atmel internal ts68c429avf atmel standard 132-lead cqfp -40/+85 atmel internal hi-rel products atmel part number norms package temperature range tc ( c) detailed qualification ts68c429amrb/c mil-std-883 84-lead pga -55/+125 atmel internal ts68c429amfb/c mil-std-883 132-lead cqfp -55/+125 atmel internal ts68c429adescxx desc 84-lead pga -55/+125 atmel internal ts68c429adescxx desc 132-lead cqfp -55/+125 atmel internal ts68c429a m r 1 b/c part number temperature range: m: -55c/+125c v: -40c/+85c package: r = pga 84 f = cqfp132 screening: b/c = mil-std-883 class b - = internal lead finish 1: hot solder dip -: gold
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