參數(shù)資料
型號： LM4560VJD
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 消費家電
英文描述： Advanced PCI Audio Accelerator
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP100
封裝： PLASTIC, TQFP-100
文件頁數(shù)： 43/54頁
文件大?。?/td> 380K
代理商： LM4560VJD
4.0 Functional Description
(Continued)
Bit 3..0 X reserved
Length = number of words to be transferred -1
For non-continuous DMA, SB ESP will generate an interrupt and terminate the DMA transfer after the specified length of data has
been transferred.
For continuous DMA, SB ESP will generate an interrupt after each specified block length of data has been transferred.
4.2.1.12 8-Bit Audio Playback/Recording Command Cxh
4.2.1.12.1 Command Bit Definition
Bit 3
0 Playback
1 Recording
Bit 2
0 Non-Continuous DMA
1 Continuous DMA
Bit 1 X Reserved
Bit 0 X Reserved
4.2.1.12.2 Command C0h/C1h/C2h/C3h/C4h/C5h/C6h/C7h
Function: 8-bit audio playback
Procedure:
1.
SB ESP_Write(C0h/C1h/C2h/C3h/C4h/C5h/C6h/C7h)
2.
SB ESP_Write(Mode)
3.
SB ESP_Write(Length.low)
4.
SB ESP_Write(Length.high)
Mode
Bit 7..6 X reserved
Bit 5
0 mono
1 stereo
Bit 4
0 unsigned PCM (0–80h–FFh)
1 signed PCM (80h–0–7Fh)
Bit 3..0 X reserved
Length = number of bytes to be transferred -1
For non-continuous DMA, SB ESP will generate an interrupt and terminate the DMA transfer after the specified length of data has
been transferred.
For continuous DMA, SB ESP will generate an interrupt after each specified block length of data has been transferred.
4.2.1.12.3 Command C8h/C9h/CAh/CBh/CCh/CDh/CEh/CFh
Function: 8-bit audio recording
Mode
Bit 7..6 X reserved
Bit 5
0 mono
1 stereo
Bit 4
0 unsigned PCM (0–80h–FFh)
1 signed PCM (80h–0–7FFh)
Bit 3..0 X reserved
Length = number of words to be transferred -1
For non-continuous DMA, SB ESP will generate an interrupt and terminate the DMA transfer after the specified length of data has
been transferred.
For continuous DMA, SB ESP will generate an interrupt after each specified block length of data has been transferred.
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