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參數(shù)資料
| 型號(hào)： | SAA7785 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | ThunderBird Avenger（TM） PCI Audio Accelerator(雷鳥Avenger（TM）PCI音頻加速器) |
| 中文描述： | 雷鳥復(fù)仇者（商標(biāo)）的PCI音頻加速器（雷鳥復(fù)仇者（商標(biāo)）的PCI音頻加速器） |
| 文件頁(yè)數(shù)： | 17/68頁(yè) |
| 文件大小： | 1303K |
| 代理商： | SAA7785 |
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ThunderBird Avenger
TM
PCI Audio
Accelerator
SAA7785
Philips Semiconductors
Preliminary Specification
1999
Nov 12
17
FIGURE 5
S/PDIF TRANSMIT PORT BLOCK DIAGRAM
VIRTUAL WRITE MASTER
Audio streams may be directed back to host memory from the DSP domain. The VWM has a data buffer capable of
storing enough audio data to burst into the host memory. The VWM is a simplified version of DMA and has more strin-
gent requirements on which and how many pages need to be allocated.
Using the VWM, the system programmer can redirect audio streams processed by the SAA7785 ThunderBird Aveng-
er
TM
device and use them in any other audio device that resides in the system. The VWM is more efficient than the
DMA and should be the device of choice when redirecting audio streams back to the host. The device supports audio
sample rates from 8 to 48 KHz.
S/PDIF XMT
Clock
Divider
Audio Data
Holding
Registers
CCLK
D
SPDO
Audio Data
Shift
Registers
Aux Data
Holding
Registers
Aux Data
Shift
Registers
Ctl/Channel
Stat Holding
Registers
Ctl/Channel
Stat Shift
Registers
User Data
Holding
Register
User Data
Shift
Register
Preamble
Generation
Validity Bit
Generation
Parity
Generation
S/PDIF XMT
Port Status
Register
S/PDIF XMT
Control
Logic
Bi-Phase
Mark
Encoder
MUX
Line
Driver
DCLK
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