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原帖由 Metaverse 于 2007-7-2 23:04 发表 ![]() ' v( `2 |: f0 r( @! Y. ]
1 ~- z) o! k+ U驱动有ASIO？:unsure:
1.2 General Description
% n2 G* H& f4 N9 L5 vThe CMI8787 is a high quality PCI 32-bit multi-channel audio processor that can be i: R, Q$ _8 O- f: h4 s
built into home audio electronics or personal computers to provide high fidelity sound: R* v4 O$ E+ M
playback and processing. It supports up to 12 output channels and 8 input channels. The
; y$ G4 N6 B/ r. I6 D1 j/ H" P12 output channels are composed of 3 playback DMA’s, which are multi-channel DMA
! ~- N2 w9 ?" B" L) i2 y1 W(32 bits, 8 channels, 192k), S/PDIF DMA (32 bits, 2 channels, 192k), and front panel
" s: H+ w1 S6 t, g1 p9 UDMA (16 bits, 2 channels, 48k). The 8 input channels are spread across 3 recording1 a7 A9 X: i: I+ f& Q/ d' w
DMA’s (32 bits, 192k) - recording A, B, and C DMA’s. The architecture of recording is5 \' k; `! U2 e# x, N7 B1 _
a unique point of CMI8787 that enables very flexible recording options for the user. The) r& t) L& S3 k+ s1 _9 _. R: ]
details of the recording mode selection will be explained in the later sections.
& t- H" y$ w: Y$ U- k& lThe CMI8787 is compatible with all the popular codecs, from I2S codecs with over
- Q. G3 R, B0 U. a0 p2 Y120dB quality to the usual AC97 codecs. This ability gives customers the flexibility to
9 S" U# a9 U T. D; Adesign their products exactly the way they want them. The I2S, AC-Link, 2-wire master
9 q, K- k6 O+ O) m- u2 a& ^bus, and SPI interfaces are used to transfer audio data and control data between the( q* U# j$ P, A- N* r4 L6 @
CMI8787 and codecs. To facilitate the connection with existing home audio electronics,
2 h7 g! Q- ^, \% ?. E! Othe CMI8787 has incorporated the S/PDIF transmitter and receiver with 192k sampling' {* @( Y F3 `" i" n' b
rate.
5 V9 n6 M8 z( {3 b0 ~" b$ O/ L, ^An EEPROM interface is built for the CMI8787 in connection with the EEPROM to$ Z" R8 b% f2 B0 q* g
store and retrieve the non-evaporable data for customer applications, such as board5 O6 w3 I: j1 R" F1 h* h! V
configuration, sub-vendor and sub-system IDs of the PCI configuration, or any dynamic+ ^7 N& ~4 F! H7 ]
data that customers want to restore at the next power-on.
6 g3 h. P& d' y& qThe CMI8787 has an independent 2-wire slave bus to communicate with the micro
4 S: } X# Y% G0 v5 s2 K& l# i8 a5 ~control unit (MCU). This interface is used as a medium for the system driver and the
2 n- y( b# g( R6 i; d( EMCU to exchange data. One of the applications of the 2-wire slave bus is to transmit the
% w) `7 ? U( g8 r' f5 U* rcontrol data from the remote controller to the system driver. The MPU-401 MIDI UART0 j y7 }$ X" M$ ?8 z+ j% z9 B
is also integrated in the CMI8787.
% b5 K" T5 G$ f. l4 ?2 W7 rThere are six GPI phone jack detect pins in CMI8787, which can be used to distinguish8 U8 n) D: k3 r" c; U* n% X0 c
if a cable is plugged in the phone jack. The re are 9 GPIO pins on the chip, however
, N3 P& ?4 W5 M/ u/ w& K& lsome of them are shared with other functions. The C-Media’s unique device sensing& Z$ `3 c, f3 x; G# D
technology is implemented in CMI8787, which can indicate whether a speaker or a
2 I5 W0 _ C7 r6 ?! d- y5 Yheadphone is plugged in the jack. Then according to this information, the system driver
( p# [: H' Y4 z7 ]can decide to turn on the C-Media’s X-ear 3D audio technology if appropriate.
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+ A% p/ q/ ?$ J5 J! W! `1.1 Hardware Features, }: E+ `5 U2 N, {, H; W
n PCI 2.2 interface with bus mastering and burst modes+ D3 W3 X1 I- ?! y3 n+ M+ _
n Only one 24.576MHz oscillator is needed
* s( i3 P# S) h$ [% B4 o% Mn 4 synchronous I2S output data stream pairs within 1 flexible output DMA' [( U1 x& L* ?! ^5 w5 q
n Programmable channel routing mechanism among the 4 I2S output pairs
3 U( e8 O9 Z0 A$ bn 4 synchronous I2S input data stream pairs spread in 3 input DMA’s (for Dolby
/ e2 v4 j7 H0 E& p( [pro-audio applications)
, i, W$ l q4 e" D7 l! D' \/ y/ g3 D. Zn Optionally, a multi-channel AC-link can support 2 AC97 codecs
* Y7 r) U3 A% m" i4 t! z6 r8 [n Programmable HW monitoring routing from I2S inputs to outputs! l: H3 w6 Q* c. d; `
n All I2S I/O pairs support 32-bit PCM data transfer and adjustable sample rate (up to
7 Z: S- W. G( h/ F9 U192KHz)# g3 g! V# X6 U: D4 O& {0 Q5 z
n Integrated 192k/24-bit S/PDIF transmitter with 1 dedicated S/PDIF OUT DMA1 I; b5 k# x* M# z* V0 z1 ~2 `
n Integrated 192k/24-bit S/PDIF receiver in recording DMA! H: c) D, ]) C. J, s
n S/PDIF IN supports digital loopback path for switching between optical and RCA k) ? L( k }9 g) O
connections1 Q2 p) ?! A4 i+ e3 V
n 48k/16-bit front panel DMA for AC97 codec
3 h$ T3 L3 U. P% `1 zn 2-wire master serial bus or 4-wire SPI (Serial Peripheral Interface) bus to control6 X% E5 U, i+ p# Z6 T
I2S codecs
# u& [+ ^/ r+ T# D$ v3 T. ln 2-wire slave serial bus to communicate with microcontroller unit (MCU)
0 j0 Y5 q: x* v. F7 R( ]* Yn Interrupt pin to inform external MCU to retrieve the data from the system driver
9 _+ C0 m; n8 O8 w* X! Nn One MPU-401 MIDI UART port, [7 U2 y! m8 F" J
n EEPROM control interface
6 Y/ d9 r% Z0 \! k( A+ y# a ^n 6 GPI phone jack detection pins
* p- R2 U2 g: J+ K+ i- n, un Advanced device-sensing technology indicates whether a speaker or a headphone% ], y# I6 S4 o, C( ^7 O( P
is plugged in the jack8 \1 p6 q r! {0 x( Q
n 9 direct-access GPIO pins J" n" T, I4 M7 |6 x- O
n 3 bonding-option bits for 8 identification possibilites
/ i% x* ^: z8 T* @n 128-pin LQFP thin high-quality package8 z, f) X' X- _8 }8 v2 ]8 p
- B3 ]- a; P; C4 @
1.3 Applications
$ j1 f2 N5 U5 q& h' Cn Pro-sumer high-quality PCI sound card for retailer market) m% v8 Y& i$ _$ f
n Consumer sound card powered by Dolby® and DTS® technologies
6 [: j! `3 [9 r, xn PC-based media center
: }* [$ G6 ` g$ h# b5 U* I. T: V" C' d# Vn Professional PC musician application( i# O$ B; w% `% P* A$ z# M
n High-end motherboard requiring top audio quality
- `* M) c4 b7 p# o) W. ] F4 u. Kn Audio up-sell for PC systems
, ]: n# N- i" C& }' v! G. Vn Bundle selling with high-profile VGA cards( `# f6 d* {/ f" Z$ T( X6 D
n General purpose multi-channel I/O
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8 k6 j& Q% i) L8 t: r% H1 z从PDF上面看，，CMedia没有提过ASIO，，估计是不支持的 |
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IP卡
狗仔卡
发表于 2007-7-2 21:19
显身卡
楼主