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原帖由 Metaverse 于 2007-7-2 23:04 发表 ![]()
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驱动有ASIO？:unsure:
. u/ U- j% _4 {9 K5 |5 S1 ]1 w1.2 General Description4 ^7 \, h: P, t4 n) m* s8 ?5 {
The CMI8787 is a high quality PCI 32-bit multi-channel audio processor that can be( T0 L: u9 o8 h& F! {: y/ d
built into home audio electronics or personal computers to provide high fidelity sound
% ?6 }, T7 x1 oplayback and processing. It supports up to 12 output channels and 8 input channels. The
# v* s4 b) k. q/ Y12 output channels are composed of 3 playback DMA’s, which are multi-channel DMA* b& [% S8 \- J% Z$ a _( {: \
(32 bits, 8 channels, 192k), S/PDIF DMA (32 bits, 2 channels, 192k), and front panel6 F& K: D8 @6 ]+ Q, E
DMA (16 bits, 2 channels, 48k). The 8 input channels are spread across 3 recording$ T8 z' d) u# Z! J0 L- A0 R
DMA’s (32 bits, 192k) - recording A, B, and C DMA’s. The architecture of recording is7 r2 a/ c; i- Q0 F% `+ D
a unique point of CMI8787 that enables very flexible recording options for the user. The
3 X/ C/ |) V# V- Cdetails of the recording mode selection will be explained in the later sections.
& y0 V# c5 l2 \The CMI8787 is compatible with all the popular codecs, from I2S codecs with over
6 Z) d* s3 e$ e, [, q7 _120dB quality to the usual AC97 codecs. This ability gives customers the flexibility to
" T6 U0 I0 @/ C9 k; l- R0 mdesign their products exactly the way they want them. The I2S, AC-Link, 2-wire master8 v8 H" c& u/ A8 R6 e2 W
bus, and SPI interfaces are used to transfer audio data and control data between the
# N9 s! }% ?( U& VCMI8787 and codecs. To facilitate the connection with existing home audio electronics,
% ]! z4 d' ~3 e8 Ythe CMI8787 has incorporated the S/PDIF transmitter and receiver with 192k sampling
. B6 W2 V7 n" N: [7 {/ grate.
& ]; c% {2 K/ T' {. M- U( pAn EEPROM interface is built for the CMI8787 in connection with the EEPROM to
1 x( o* a, k _; Dstore and retrieve the non-evaporable data for customer applications, such as board
; U" [$ S7 R& w4 {configuration, sub-vendor and sub-system IDs of the PCI configuration, or any dynamic
* W6 d8 x" T/ f, l; z$ C$ |data that customers want to restore at the next power-on.
4 @* F: j% X+ i0 RThe CMI8787 has an independent 2-wire slave bus to communicate with the micro5 U3 r4 J) d6 q' `( N
control unit (MCU). This interface is used as a medium for the system driver and the* t; @# F6 d' ~3 C) w
MCU to exchange data. One of the applications of the 2-wire slave bus is to transmit the2 }# n1 {8 g0 j$ U0 ?, W( c
control data from the remote controller to the system driver. The MPU-401 MIDI UART0 z- B( G$ u8 y
is also integrated in the CMI8787.
% g K0 Q0 }3 d$ f0 \There are six GPI phone jack detect pins in CMI8787, which can be used to distinguish
2 i2 i) s9 G/ e+ y. iif a cable is plugged in the phone jack. The re are 9 GPIO pins on the chip, however
; _' Q* z; m# L7 s" f7 k& p$ [some of them are shared with other functions. The C-Media’s unique device sensing/ u. Y8 \: n5 x+ F! C
technology is implemented in CMI8787, which can indicate whether a speaker or a% k4 n6 @; {& K' Q7 e
headphone is plugged in the jack. Then according to this information, the system driver
/ e. C9 B) S Z ~* j" Mcan decide to turn on the C-Media’s X-ear 3D audio technology if appropriate.
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1.1 Hardware Features
1 `- d3 W9 U3 b) |* |' T2 en PCI 2.2 interface with bus mastering and burst modes1 _: Z3 w$ l& E
n Only one 24.576MHz oscillator is needed! |6 G- K- b2 C: N1 r
n 4 synchronous I2S output data stream pairs within 1 flexible output DMA5 B* H' D% H7 O
n Programmable channel routing mechanism among the 4 I2S output pairs
! y( V: j+ ?' q2 O9 x7 f0 Hn 4 synchronous I2S input data stream pairs spread in 3 input DMA’s (for Dolby# C& M4 Z1 @1 ~1 K4 C" R
pro-audio applications)
, j! U* P7 w) w9 c6 in Optionally, a multi-channel AC-link can support 2 AC97 codecs
# g0 \; i' c% d. ], J1 Jn Programmable HW monitoring routing from I2S inputs to outputs6 w/ Y' B/ k/ P7 M1 d6 ?3 g
n All I2S I/O pairs support 32-bit PCM data transfer and adjustable sample rate (up to1 y8 h' }3 P, y4 n0 U5 J; B2 j
192KHz)
3 H' ~5 d2 k1 @. yn Integrated 192k/24-bit S/PDIF transmitter with 1 dedicated S/PDIF OUT DMA
, G! P! t2 C0 I. H/ ?n Integrated 192k/24-bit S/PDIF receiver in recording DMA8 C" s' |* g; S2 e$ _
n S/PDIF IN supports digital loopback path for switching between optical and RCA2 P# }3 l' y4 o) q
connections' A3 q* m/ T; ]* u2 d* L2 l
n 48k/16-bit front panel DMA for AC97 codec
. i- o. y8 A7 b- G9 t0 pn 2-wire master serial bus or 4-wire SPI (Serial Peripheral Interface) bus to control# W3 j# f5 z/ K* ~( L+ t) P, U
I2S codecs0 A, m* R9 ~ R) D! j6 f4 }
n 2-wire slave serial bus to communicate with microcontroller unit (MCU)# n0 L B8 `! f# G9 J2 P# h8 F" O
n Interrupt pin to inform external MCU to retrieve the data from the system driver
: J g2 b5 C2 ~: {3 _+ M9 I% xn One MPU-401 MIDI UART port
/ U+ {8 E6 Z n, ]7 Z1 r1 ^- H, in EEPROM control interface
V: I8 `& Z% Z/ O* ` L0 e9 Dn 6 GPI phone jack detection pins
3 o2 }! l% u6 t4 dn Advanced device-sensing technology indicates whether a speaker or a headphone
2 ~: X, z4 |8 n% O+ His plugged in the jack) }4 I: F: `/ T$ M- v
n 9 direct-access GPIO pins
4 B, {1 U- w; Wn 3 bonding-option bits for 8 identification possibilites% C; J1 A- P* b; Z8 l: P
n 128-pin LQFP thin high-quality package
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1.3 Applications6 e9 L! R+ {3 I! ?# N
n Pro-sumer high-quality PCI sound card for retailer market
7 p4 G; v# g/ P, g& h# g( C. Vn Consumer sound card powered by Dolby® and DTS® technologies8 A3 s( h1 U+ Q% P% m. k$ {$ I
n PC-based media center* V) R$ e2 W. t# ~
n Professional PC musician application" k# ~, y. O, L0 }1 e# v
n High-end motherboard requiring top audio quality
4 g: T7 [3 U, Q% l2 Rn Audio up-sell for PC systems
# p) h9 h+ ?9 w4 e: d( H# jn Bundle selling with high-profile VGA cards
7 ~- p7 ^+ _ o: D) E* x; }0 zn General purpose multi-channel I/O
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9 N5 v3 k* \& y6 ~4 j! M S ~% s$ J. T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