參數(shù)資料
型號(hào)： LM4560VJD
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 消費(fèi)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(yè)數(shù)： 39/54頁(yè)
文件大?。?/td> 380K
代理商： LM4560VJD
4.0 Functional Description
(Continued)
will generate an interrupt and wait for next command.
Continuous DMA Mode
SB ESP is programmed to make continuous transfer to/
from CODEC. After each transfer of a specified block
size, the SB ESP will generate an interrupt and continue
the next transfer of the same block size after the interrupt
is acknowledged.
There are two ways to terminate continuous DMA mode
transfer.
Program the SB ESP to switch to normal DMA mode
transfer. At the end of the current DMA transfer, the SB
ESP will exit from continuous DMA mode and continue to
transfer using the specified normal DMA mode.
Send the exit continuous command. The SB ESP will exit
continuous DMA mode at the end of current block and
terminate the transfer.
Special DMA Mode
Once SB ESP is in the special DMA mode, it will not ac-
cept any further commands or data until the DMAmode is
terminated by the following two methods:
Non-continuous special DMA mode will exit special DMA
mode automatically at the end of transfer.
For continuous special DMA mode, a SB ESP_Reset() is
needed to exit special DMA mode. The SB ESP_Reset()
will only stop special DMA transfer, all other parameters
remain the same.
4.2.1.3 Legacy Sound Blaster Compatible Digitized Sound Sampling Rate Setup
4.2.1.3.1
4.2.1.3.2 Set Sampling Rate By Time Constant
Time constant = 256d (1,000,000d / (channel * sampling rate))
4.2.1.3.3 Set Sampling Rate By Sampling Frequency
Frequency = 4 kHz to 48 kHz, either mono or stereo
4.2.1.4 Legacy Sound Blaster Esp Engine Digital Audio Command Set
0xh Reserved
1xh Set Audio Output Mode for 8 Bit Playback
2xh Set Audio Input Mode for 8 Bit Recording
3xh Reserved
4xh Set Sample Rate and Continuos/Special DMA Block Length
5xh Reserved
6xh Reserved
7xh SB ADPCM Playback
8xh Output Silence
9xh 8 Bit Special DMA Mode Playback/Record
Axh Reserved
Bxh 16-Bit DMA Audio I/O
Cxh 8-Bit DMA Audio I/O
Dxh Control DMA and Speaker
Exh SB ESP Version and Diagnostic Test
Fxh SB ESP Test
All 8-bit SB ESP command is unsigned PCM playback/recording command except Cxh command.
All 8-bit SB ESP command is mono playback/recording command except command 14h, 1Ch , 9xh and Cxh
4.2.1.5 8-Bit Playback Only Command 1Xh
SB ESP uses SBMX0E.1 to do mono/stereo playback.
SBMX0E.1 = 0 for mono playback
1 for stereo playback
4.2.1.5.1 Command Bit Definition
Bit 30 Direct or Normal DMA Mode
1 Continuous DMA Mode
Bit 20 Direct Mode
1 DMA Mode
Bit 10 8-Bit Data PCM
1 Reserved
Bit 00 Normal
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