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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 |
| 文件頁數(shù)： | 41/54頁 |
| 文件大小： | 380K |
| 代理商： | LM4560 |
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4.0 Functional Description
(Continued)
4.2.1.7.2 Command 41h
Function: Set Playback Sample Rate by Frequency
Sampling Frequency = 4 kHz to 48 kHz, either mono or stereo
4.2.1.7.3 Command 42h
Function: Set Recording Sample Rate by Frequency
Sampling Frequency = 4 kHz to 48 kHz, either mono or stereo
4.2.1.7.4 Command 48h
Function: Set Block Length for Continuous and Special DMA
Length = number of bytes to be transferred - 1
SB ESP will generate an interrupt after the specified block length of data has been transferred.
4.2.1.8 SB ADPCM Playback Only Command 7xh
4.2.1.8.1 Command 72–77h
Function: SB ADPCM normal DMA playback
Length = number of bytes to be transferred - 1
These commands are not supported, the implemented SB ESP engine will behave like its normal operation except silent the out-
put and do not perform the bus mastering operation.
4.2.1.8.2 Command 7A–7Fh
Function: SB ADPCM continuous DMA playback
These commands are not supported, the implemented SB ESP engine will behave like its normal operation except silent the out-
put and do not perform the bus mastering operation.
4.2.1.9 Output Silence Command 8xh
4.2.1.9.1 Command 80h
Function: Silence Digital Audio for a Duration
Duration = number of sample rate count - 1
After the specified duration elapses, SB ESP will generate an interrupt. During silence period, SB ESP output middle range data
to CODEC (8000h).
4.2.1.10 Special DMA Playback/Recording Command 9xh
All special DMA mode use command 48h to set the transfer block size. The non-continuous special DMA mode will interrupt the
CPU at the end of the transfer block and wait for new command. Use SB ESP_Reset( ) to end the continuous special DMA, all
other parameters remain the same after the SB ESP_Reset( ).
SB ESP uses SBMX0E.1 to do mono/stereo playback.
SBMX0E.1 = 0 for mono playback
1 for stereo playback
MX0E.1 default value is 0 after power up reset or mixer reset
SB ESP uses command A0h/A8h to set mono/stereo recording state.
Mono recording after SB ESP command A0h
Stereo recording after SB ESP command A8h
Default recording state after power up reset or ESP_Reset() is mono.
4.2.1.10.1 Command Bit Definition
Bit 3
0 Special DMA Playback
1 Special DMA Recording
Bit 2 X reserved
Bit 1 X reserved
Bit 0
0 Continuous DMA
1 Non-Continuous DMA
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