參數(shù)資料
型號(hào)： LM4560
廠商： National Semiconductor Corporation
英文描述： Advanced PCI Audio Accelerator
中文描述： 先進(jìn)的PCI音頻加速器
文件頁(yè)數(shù)： 40/54頁(yè)
文件大?。?/td> 380K
代理商： LM4560
4.0 Functional Description
(Continued)
1 Reserved
4.2.1.5.2 Command 10h
Function: 8-bit direct mode playback
4.2.1.5.3 Command 14h
Function: 8-bit normal DMA playback
Length = number of bytes to be transferred - 1
SB ESP will generate an interrupt after the specified length of data has been transferred.
4.2.1.5.4 Command 16h/17h
Function: SB ADPCMDMA playback
Length = number of bytes to be transferred - 1
These two commands are not supported.
4.2.1.5.5 Command 1Ch
Function: 8-bit continuous DMA playback
SB ESP will generate an interrupt after each block length of data has been transferred.
4.2.1.5.6 Command 1Eh/1Fh
Function: SB ADPCMDMA playback
These two commands are not supported.
4.2.1.6 8-Bit Recording Only Command 2xh
SB ESP uses SBMX0E.1 to do mono/stereo recording.
SBMX0E.1 = 0 for mono recording.
1 for stereo recording.
4.2.1.6.1 Command Bit Definition
Bit 3
0 Direct Mode or Normal DMA Mode
1 Continuous DMA Mode
Bit 2
0 Direct Mode
1 DMA Mode
Bit 1 X reserved
Bit 0 X reserved
4.2.1.6.2 Command 20h
Function: 8-bit direct mode recording
4.2.1.6.3 Command 24h
Function: 8-bit normal DMA recording
Length = number of bytes to be transferred - 1
SB ESP will generate an interrupt after the specified length of data has been transferred.
4.2.1.6.4 Command 2Ch
Function: 8-bit continuous DMA recording
SB ESP will generate an interrupt after each block length of data has been transferred.
4.2.1.7 Set Sample Rate And Continuous/Special Dma Block Length Command 4xh
4.2.1.7.1 Command 40h
Function: Set Sample Rate by Time Constant
Time_Constant = 256d (1,000,000d / (Channel * Sampling Rate))
Channel = 1 for mono or SB16 command, 2 for stereo of SBPRO command
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