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oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 1 /24 description the cmi 8786 is a high quality pci 32 - bit multi - channel audio processor that can be built in the home audio electronics or personal computer to provide high fidelity sound and become a professional audio processing center in your life. it supports up to 10 outgoing ch annels and 4 ingoing channels. the 1 0 out going channels are composed of 2 playback dmas, which are multi - channel dma ( 24 bits, 8 channels, 96 k), s/pdif dma ( 24 bits, 2 channels, 192k) . the 4 ingoing channels are spread in 2 recording dmas ( 24 bits, 96 k ), namely recording a, b, dmas. the architecture of recording is a unique point of cmi 8786 that makes the recording become the most flexible for the users. the details of the recording mode selection will be explained in the later sections. features ? pci 2.2 interface with bus mastering and burst modes ? only one 24.576mhz oscillator is needed ? 4 synchronous i2s output data stream pairs within 1 flexible output dma ? programmable channel routing mechanism among the 4 i2s output pairs ? an alternatively multi - cha nnel ac - link can support 1 ac97 codec ? programmable hw monitoring routing from i2s inputs to outputs. all i2s i/o pairs support 24 - bit high - definition pcm data transfer and adjustable sample rate up to 96 khz block diagram
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 2 /24 table of contents revision history ................................ ................................ ................................ ................................ ....... 3 1. description and overview ................................ ................................ ................................ ................ 4 2. features ................................ ................................ ................................ ................................ ............ 4 3. applications ................................ ................................ ................................ .......................... 5 4. block diagram ................................ ................................ ................................ ................................ . 6 5. pin assignment ................................ ................................ ................................ ................................ . 7 5.1 pin - out diagram ................................ ................................ ................................ ........... 7 5.2 pin descriptions ................................ ................................ ................................ ............ 8 6. electrical characteristics ................................ ................................ ................................ ................ 12 6.1 maximum ratings ................................ ................................ ................................ ....... 12 6.2 recommended operation conditions ................................ ................................ ......... 12 6.3 power c onsumption ................................ ................................ ................................ .... 12 6.4 dc characteristics ................................ ................................ ................................ ....... 12 6.5 ac timing characteristics ................................ ................................ .......................... 13 6.5.1 i2s signal timing ................................ ................................ ................................ ... 13 6.5.2 c ontrol i nterface t iming - 3 - w ire m ode ................................ ............................. 14 6.5.3 c ontrol i nterface t iming - 2 C w ire m ode ................................ ............................ 15 6.5.4 eeprom interface timing ................................ ................................ .................... 16 6.5.5 eeprom ac timing characteristics ................................ ................................ .... 17 6.5.6 ac - l ink t iming c haracteristics: ................................ ................................ ........... 18 7. mechanical specification ................................ ................................ ................................ ............... 22 7.1 package dimension ................................ ................................ ................................ ... 22
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 3 /24 revision history date rev. release note 20 10/3/26 rev . 0.1 first version
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 4 /24 1. description and overview the cmi 8786 is a high quality pci 32 - bit multi - channel audio processor that can be built in the home audio electronics or personal computer to provide high fidelity sound and become a professional audio processing center in your life. it supports up to 1 0 outgoing channels and 4 ingoing channels. the 1 0 out going channels are composed of 2 playback dmas, which are multi - channel dma ( 24 bits, 8 channels, 96 k), s/pdif dma ( 24 bits, 2 channels, 192 k) . the 4 ing oing channels are spread in 2 recording dmas ( 24 bits, 96 k ), namely recording a, b dmas. the architecture of recording is a unique point of cmi 8786 that makes the recording become the most flexible for the users. the details of the recording mode selection will be explained in the later sections. the c mi 8786 can co - work with all the popular codecs nowadays from i2s codecs with over 120db quality to the usual ac97 codecs. this ability gives customers the flexibility to design their products. the i2s, ac - link, 2 - wire master bus, and spi interfaces are use d to transfer audio data and control data between the cmi 8786 and codecs. to facilitate the connection with the existing home audio electronics, the cmi 8786 has incorporated the s/pdif transmitter and receiver with 192k sampling rate in it. an eeprom inter face is built for the cmi 8786 in connection with the eeprom to store and retrieve the non - evaporable data for the customer applications, such as board configuration, sub - vender and sub - system ids of the pci configuration, or any dynamic data that customers want to save for the next power - on to restore. the mpu - 401 midi uart is also integrated in the cmi 8786 . there are six gpi phone jack detect pins in cmi 8786 , which can be used to distinguish if a cable is plugged in the phone jack. the gpio pins of cmi 8786 are nine; however. 2. features ? pci 2.2 interface with bus mastering and burst modes ? only one 24.576mhz oscillator is needed ? 4 synchronous i2s output data stream pairs within 1 flexible output dma ? programmable channel routing mechanism among the 4 i2s output pairs ? 1 synchronous i2s inp ut data stream pairs . ? an alternatively mul ti - channel ac - link can support 1 ac97 codec ? programmable hw monitoring routing from i2s inputs to outputs. ? all i2s i/o pairs support 24 - bit high - definition pcm data transfer and adjustable sample rate up to ? 96 khz ? integrated 192k/24 - bit s/pdif transmitter with 1 dedicated s/pdif out dma ? integrated 192k/24 - bit s/ pdif receiver with 1 dedicated s/pdif in dma ? s/pdif in supports digital loop back path for transforming between o ptical and rca connection
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 5 /24 ? a 48k/16 - bit front panel dma for ac97 codec ? 2 - wire master serial bus or 4 - wire spi (serial port interface) to control i2s codecs ? interrupt pin to inform external mcu to retrieve the data that system driver wants to pass out ? o ne mpu - 401 midi uart port ? eeprom control interface ? 6 gpi phone jack detection pins to distinguish if a cable is plugged in the jack ? 9 direct access gpio pins ? 128 - pin lqfp high - quality thin package 3. applications ? pro - sumer high - quality pci sound card for retailer market ? pc - based media center ? wireless media adapter ? professional pc musician application ? high - end motherboard requiring top audio quality ? audio up - sell for pc systems ? bundle selling with high - profile vga cards ? general purpose mult i - channel i/o
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 6 /24 4. block diagram figure 1. block diagram of oxygen tm hd cmi 8786
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 7 /24 5. pin assignment 5.1 pin - o ut diagram figure 2. pin - o ut diagram of oxygen tm hd cmi 8786 1 0 9 1 1 0 1 1 1 1 1 2 1 1 3 1 1 4 1 1 5 1 1 6 1 1 7 1 1 8 1 1 9 1 2 0 1 2 1 1 2 2 1 2 3 1 2 4 1 2 5 1 2 6 1 2 7 1 2 8 c m 8 7 8 6 ( l q f p - 1 2 8 ) 3 1 3 2 3 3 3 4 3 5 3 6 3 7 3 8 5 8 5 7 5 6 5 5 5 4 5 3 5 2 5 1 5 0 4 9 4 8 4 7 4 6 4 5 4 4 4 3 4 2 4 1 4 0 3 9 d v d d x r x d x t x d x g p i o 4 x g p i o 3 x g p i o 2 x g p i o 1 x g p i o 0 x t a l 2 x t a l 1 d v d d x a d 2 x a d 3 x a d 4 d g n d n c n c x a d 0 x a d 1 d g n d 6 4 6 3 6 2 6 1 6 0 5 9 x a c 9 7 _ s d o 0 x a c 9 7 _ b c l k x a c 9 7 _ s d i 0 x a c 9 7 _ r s t 0 n c x a c 9 7 _ s y n c 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 3 0 1 2 3 4 5 6 7 8 9 1 0 x a d 2 6 x a d 2 5 x a d 2 4 x c b 3 x i d s e l d v d d x a d 2 3 x a d 2 2 x a d 2 1 x a d 2 0 x a d 1 9 d g n d x a d 1 8 x a d 1 7 x a d 1 6 x c b 2 x f r a m e x i r d y d v d d x t r d y x d e v s e l x p a r x c b 1 x a d 1 5 d g n d x a d 1 4 x a d 1 3 x a d 1 1 x s t o p x a d 1 2 x a d 1 0 x a d 9 x c b 0 x a d 8 x a d 7 x a d 6 x a d 5 d v d d d g n d x g p i o 8 x g p i o 7 x g p i o 6 x g p i o 5 n c n c n c n c x a d c 1 _ s d i n x a d c 1 _ b c l k x a d c 1 _ l r c k x a d c 1 _ m c l k d v d d x d a c _ s d o u t 3 x d a c _ s d o u t 2 x d a c _ s d o u t 1 x d a c _ s d o u t 0 x d a c _ b c l k x d a c _ l r c k x d a c _ m c l k x s p i _ c e n 3 x s p i _ c e n 2 x s p i _ c e n 1 x s p i _ c e n 0 d v d d x s p i _ d o u t / x a 1 x s p i _ d i n / x m s d a d g n d x s p i _ c l k / x m s c l x m c u _ i n t d g n d x e e d o / x s p i _ c e n 5 x e e s k / x s p i _ c e n 4 x e e c s x e e d 1 x a c 9 7 _ m c l k x s t o 7 2 7 1 7 0 6 9 6 8 6 7 6 6 6 5 9 2 9 1 9 0 8 9 8 8 8 7 8 6 8 5 8 4 8 3 8 2 8 1 8 0 7 9 7 8 7 7 7 6 7 5 7 4 7 3 1 0 2 1 0 1 1 0 0 9 9 9 8 9 7 9 6 9 5 9 4 9 3 1 0 8 1 0 3 1 0 4 1 0 5 1 0 6 1 0 7 x g p i 1 x g p i 2 x g p i 3 x g p i 4 x g p i 5 x g p i o 9 / d g n d x p w d n x s p d i f o d v d d x i n t a x r s t x c l k 3 3 x g n t x r e q x a d 3 1 x a d 3 0 x a d 2 9 x a d 2 8 d g n d x a d 2 7 n c n c n c n c x s p d i f i x g p i 0
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 8 /24 5.2 pin descriptions the following table is the pin description of the oxygen tm hd cmi 8786 . some of the pins own multiple functions. therefore, for the sake of consistency, a pin may be listed more than once in the table. the abbreviations used in the pin description table are explained below. di: digital input signal do: digital output sign al dio: digital bidirectional signal ai: analog input pu: pull - up with 75k resistor pd: pull - down with 75k resistor #: low active signal table 3.1 pin description table of oxygen tm hd cmi 8786 symbol pin no. type description pci bus interface xrst 119 di pci bus reset. xclk33 120 di pci bus clock, 33mhz. xidsel 5 di pci initialization device select. this is the chip select during pci configuration access. xgnt# 121 di pci bus grant. when active, pci bus master is granted to cmi 8786 . xreq# 122 dio pci bus master request. when active means cmi 8786 requests to become a bus master. xad[31:0] 1 - 3, 7 - 11, 13 - 15, 25, 27, 28 - 31, 33, 35 - 38, 40 - 44, 123 - 126, 128 dio pci address / data bus xcb#[3:0] 4, 16, 24, 34 dio pci bus command / byte enable x frame# 17 dio pci cycle frame. it is driven by the current master to indicate the beginning and duration of an access xdevsel# 21 dio pci device select. when active, indicates the driving device has decoded its address as the target of the current access. xirdy# 18 dio pci initiator ready. when active, indicates the initiator has the ability to complete the current data phase of the transaction. xtrdy# 20 dio pci target ready. when active, indicates the target device has the ability to complete the current data phase of the transaction. xstop# 22 dio pci stop. when active, indicates the current target is requesting the master to stop the current transaction. xpar 23 dio pci parity. it is even parity across xad[31:0] and xcb#[3:0]. xinta# 118 dio pci interrupt request a.
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 9 /24 mpu - 401 midi uart interface xtxd 54 dio, pu mp - 401 midi transmitter (output). it is also used as xgpio5~8 and i2s adc 3 configuration (input, 0: gpio5~8, 1: i2s adc 3) at the rising edge of xrst. xrxd 55 di, pu mpu401 midi receiver. i2s interface xdac_mclk 82 do i2s dac master clock output . xdac_lrck 83 dio i2s dac left/right sample clock . xdac_bclk 84 dio i2s dac bit clock . xdac_sdout0 85 do i2s dac channel 0,channel 1 serial data output . xdac_sdout1 86 do i2s dac channel 2,channel 3 serial data output . xdac_sdout2 87 do i2s dac channel 4,channel 5 serial data output . xdac_sdout3 88 do i2s dac channel 6,channel 7 serial data output . xadc1_mclk 90 do i2s adc 1 and i2s adc 4 master clock output . xadc1_lrck 91 dio i2s adc 1 left/right sample clock . xadc1_bclk 92 dio i2s adc 1 bit clock . xadc1_sdin 93 di, pu i2s adc 1 serial data input . ac - link interface x ac97_bclk 63 di, pu ac97 serial clock input 8 xac97_sdi0 62 di, pd ac97 serial data input 0 xac97_sync 61 do ac97 frame synchronization. xac97_sdo0 64 do ac97 serial data output 0. xac97_rst0 60 do ac97 codec reset 0. xac97_mclk 65 do ac97 master clock 24.5760m for ac97 codec. serial port interface xspi_din / xmsda 73 dio, pu spi data input. this pin is shared with 2 - wire master serial data . xspi_clk / xmscl 74 dio, pu spi clock output. this pin is shared with 2 - wire master serial clock . xspi_dout 75 dio, pu spi data output. xspi_cen0 77 dio, pu spi chip enable, which select the codec #0 to be controlled. xspi_cen 1 78 dio, pu spi chip enable, which select the codec #1 to be controlled (output). xspi_cen 2 79 dio, pu spi chip enable, which select the codec #2 to be controlled (output).
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 10 /24 xspi_cen 3 80 dio, pu spi chip enable, which select the codec #3 to be controlled (output). xspi_cen 4/ xeesk 68 do spi chip enable, which select the codec #4 to be controlled . it is shared with eeprom serial clock. xspi_cen 5/ xeedo 69 do spi chip enable, which select the codec #5 to be controlled . it is shared with eeprom serial data out. 2 - wire master serial bus xmsda/ xspi_din 73 dio, pu 2 - wire serial bus data. this pin is shared with spi data input. xmscl/ xspi_clk 74 dio, pu 2 - wire serial bus clock. this pin is shared with spi clock output. s/pdif interface xspdifi 107 di s/pdif receiver. xspdifo 116 do s/pdif transmitter. eeprom interface xeecs 67 dio, pd eeprom chip enable (output). it is also used as power on eeprom cs delay configuration (input, 0: no delay, 1: delay 1 clock) at the rising edge of xrst xeesk/ xspi_cen 4 68 do eeprom serial clock. this pin is shared with spi chip enable, which select the codec #4 to be controlled xeedi 66 di, pu eeprom serial data in xeedo/ xspi_cen 5 69 do eeprom serial data out. this pin is shared with spi chip enable, which select the codec #5 to be controlled jack detect gpi interface xgpi0 108 di, pd jack a detection input xgpi1 109 di, pd jack b detection input xgpi2 110 di, pd jack c detection input xgpi3 111 di, pd jack d detection input xgpi4 112 di, pd jack e detection input xgpi5 113 di, pd jack f detection input gpio interface xgpio0 49 dio, pd gpio0, default output low. xgpio1 50 dio, pd gpio1, default output low. xgpio2 51 dio, pd gpio2, default input. xgpio3 52 dio, pu gpio3, default output low. xgpio4 53 dio, pu gpio4, default input. xgpio5 98 dio, pd gpio5, default output low.
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 11 /24 xgpio6 99 dio, pd gpio6, default input. xgpio7 100 dio, pd gpio7, default output low. xgpio8 101 dio, pd gpio8, default input. no connection nc 57 nc 58 nc 59 nc 94 nc 95 nc 96 nc 97 nc 103 nc 104 nc 105 nc 106 miscellaneous xtal1 46 di 24.576mhz osc input xtal2 47 do osc output xrsto 71 do external codec reset, can be programmed as active low or high with register 0x50 - bit 2 xpwdn 115 do power down output pin, active low, default high dvdd 6, 19, 32, 45, 56, 76, 89, 117 3.3v power input dgnd 12, 26, 39, 48, 70, 81, 102, 114 ground
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 12 /24 6. electrical characteristics 6.1 maximum ratings test conditions dvdd = 3.3v, dgnd =0v,ta=+25oc parameter symbol min typ max units storge temperature - - 55 - 150 o c operating ambient temperature - 0 25 75 o c dc supply voltage - 3.0 3.3 3.6 v i/o pin voltage - gnd - v dd v power dissipation - - 0.15 - w 6.2 recommended operation conditions test conditions dvdd = 3.3v, dgnd =0v,ta=+25 o c parameter symbol min typ max units input voltage range - v dd - 0.3 v dd v dd +0.3 v o utput voltage range - 0 - v dd v 6.3 power c onsumption test conditions dvdd = 3.3v, dgnd =0v,ta=+25 o c parameter symbol min typ max units s upply current : power up - - 40 - ma s upply current : power down - - 10 - ua 6.4 dc characteristics test conditions dvdd = 3.3v, dgnd =0v,ta=+25oc parameter symbol min typ max units input voltage range vin v dd - 0.3 v dd v dd +0.3 v o utput voltage range vout 0 - v dd v h igh level input voltage vih 0.7v dd - - v l ow level input voltage vil - - 0.3v dd v h igh level output voitage voh 2.4 - - v l ow level output voltage vol - 0.4 v i nput leakage current iil - 10 - 10 ua o utput leakage current iol - 10 - 10 ua o utput buffer driver current - - 8 - ma spdif transmit output driver current - - 8 - ma
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 13 /24 6.5 ac timing characteristics 6.5.1 i2s signal timing a. s ystem c lock t iming system clock timing diagram test conditions dvdd = 3.3v, dgnd =0v,ta=+25oc,fs=96khz,mclk=512fs,24 bit data,unless otherwise stated system clock timing parameters parameter symbol min typ max units mclk clock cycle time tmclk 20 - - ns mclk pulse width high tmclkh 10 - - ns mclk pulse width high tmclkl 10 - - ns mclk duty cycle 40 50 60 % b. a udio interface timing audio interface timing diagram test conditions dvdd = 3.3v, dgnd =0v,ta=+25oc,fs=96khz,mclk=512fs,24 bit data, unless otherwise stated audio interface timing parameters parameter symbol min typ max units lrck propagation delay from bclk falling edge t dl 5 - - n s sdout propagation delay from bclk falling edge t dd 5 - - n s
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 14 /24 6.5.2 c ontrol i nterface t iming - 3 - w ire m ode control interface timing - 3 - wire diagram note: latch data at xspi_cen clock low mode, xspi_cen clock can be low or high mode test conditions dvdd = 3.3v, dgnd =0v, ta= +25 o c, spi clock 160 ns , unless otherwise stated control interface timing - 3 - wire parameters parameter symbol min typ max units xspi_ clk rising edge to xspi_cen rising edge t scs 120 - - ns xspi_clk pulse cycle time t scy 160 - - ns xspi_clk pulse width low t scl 80 - - ns xspi_clk pulse width high t sch 80 - - ns xspi_dout to xspi_clk set - up time t dsu 40 - - ns xspi_dout to xspi_clk hold time t dho 40 - - ns xspi_cen rising to sclk rising t css 40 - - ns
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 15 /24 6.5.3 c ontrol i nterface t iming - 2 C w ire m ode control interface timing - 2 - wire diagram test conditions dvdd = 3.3v, dgnd =0v, ta=+25 o c , 2 wire , fast speed mode, unless otherwise stated control interface timing - 2 - wire parameters parameter symbol min typ max units xmscl frequency 400 - - khz xmscl pulse width low t1 650 - - ns xmscl pulse width high t2 1.3 - - us h old time (start condition) t3 650 - - ns s et - up time (start condition) t4 650 - - ns data set - up time t5 650 - - ns xmsdi,xmscl rise time t6 100 - - ns xmsdi,xmscl fall time t7 100 - - ns s et - up time (stop condition) t8 650 - - ns data hold time t9 650 - - ns note: test parameters at 2 wire , fast speed mode
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 16 /24 6.5.4 eeprom i nterface timing eeprom interface timing diagram test conditions dvdd = 3.3v, dgnd =0v, ta=+25 o c, unless otherwise stated eeprom interface timing parameters parameter symbol min typ max units xeesk clock frequency tsk 555 - - khz xeesk high time tskh 900 - - ns xee s k low time tskl 900 - - ns xeecs setup time tcss 900 - - ns xeedi setup time tdis 900 - - ns xeecs hold time tcsh 900 - - ns xeedi hold time tdih 2 - - ns o utput delay to tpd1 900 - - ns o utput delay to tpd0 30 - - ns xeecs to status valid tsv 30 - - ns xeecs to xeedo in high impedance tdf 30 - - ns
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 17 /24 6.5.5 eeprom ac timing characteristics symbol description min max units fsk sk clock frequency 0 0.5 mhz tskh sk high time 500 ns tskl sk low time 500 ns tcss cs setup time 100 ns tcsh cs hold time 0 ns tdis di setup time 200 ns tdih di hold time 200 ns tpd0 output delay to 0 500 ns tpd1 output delay to 1 500 ns tsv cs to status valid 500 ns tdf cs to do high impedance 200 ns
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 18 /24 6.5.6 ac - l ink t iming c haracteristics: test conditions dvdd = 3.3v, dgnd =0v,ta=+25oc ,unless otherwise stated 1. cold rest cold reset timing diagram cold reset timing parameters parameter symbol min typ max units xac97_rst active low pulse width tr st _low 1. 7 - - us xac97_rst inactive to xac97_b clk startup delay trst2clk 168 - - ns # denotes active low.
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 19 /24 2. w arm r eset warm reset diagram warm reset parameters parameter symbol min typ max units xac97_ sync active high pulse width t sync _high 1. 2 - - us xac97_ sync inactive to xac97_ b clk startup delay t sync 2clk 168 - - ns 3. ac - l ink c locks bit_clk to sync timing diagram
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 20 /24 bit_clk to sync timing parameters parameter symbol min typ max units xac97_ bclk frequency 12.288 - - mhz xac97_ bclk period tclk_period 81.4 - - ns xac97_ bclk output jitter 750 - - ps xac97_ bclk high pulsewidth (note 1) tclk_high 40.7 - - ns xac97_ bclk low pulse width (note 1) tclk_low 40.7 - - ns xac97_ sync frequency 48.0 - - khz xac97_ sync period tsync_period 20.8 - - us xac97_ sync high pulse width tsync_high 1.3 - - us xac97_ sync low_pulse width tsync_low 19.5 - - us note: worst case duty cycle restricted to 45/55. 4. d ata s etup and h old data setup and hold diagram data setup and hold parameters parameter symbol min typ max units setup to falling edge of xac97_ bclk tsetup 30 - - ns hold from falling edge of xac97_ bclk thold 30 - - ns note: setup and hold time parameters for sdata_in are with respect to the ac ?97 controller.
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 21 /24 5. s ignal r ising and f alling t imes signal rising and falling times diagram signal rising and falling time parameters parameter symbol min typ max units xac97_ bclk rising time triseclk 6 - - ns xac97_ bclk falling time tfallclk 6 - - ns xac97_ sync rising time trisesync 6 - - ns xac97_ sync falling time tfallsync 6 - - ns xac97_ sdi rising time trisedin 6 - - ns xac97_ sdi falling time tfalldin 6 - - ns xac97_ sdo rising time trisedout 6 - - ns xac97_ sdo falling time tfalldout 6 - - ns
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 22 /24 7. mechanical specification 7.1 package dimension
oxygen tm hd cmi878 6 high performance pci audio processor www.cmedia.com.tw copyright ? c - media electronics inc. rev. 0 . 1 page 23 /24 end of specifications c - media electronics inc. 6f., 100, sec. 4, civil boulevard, taipei, taiwan 106 r.o.c. tel + 886 - 2 - 8773 - 1100 fax + 886 - 2 - 8773 - 2211 e - mail sales@cmedia.com.tw disclaimer: information furnished by c - media electronics inc. is believed to be accurate and reliable. however, no responsibility is assumed by c - media electronics inc. for its use, nor for any infringements of patents or other rights of third parties that may result from its use. specifications subject to change without notice. no li cense is granted by implication or otherwise under any patent or patent rights of c - media. trademark and registered trademark are t he property of their respective owners.

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