ALS300 Datasheet, PDF (34/66 Pages) List of Unclassifed Manufacturers – Media Audio Controller SPEC

Avance Logic Inc.
48h set block length for continuous and special DMA
a. EPS_WRITE(48h)
b. ESP_WRITE(length.low)
c. ESP_WRITE(length.high)
Length = # of byte transfer - 1
ESP will generate an interrupt after transferred the block of data.
After reset, the default block size is 2048. Length = 07FFh
All ADPCM 8 Bit Output
7Xh
Bit 3 0
1
normal DMA mode
continuous DMA mode
Bit 2 Bit 1
0
0
reserved
0
1
4:1 ADPCM 2 to 8 bit mode
1
0
2:1 ADPCM 4 to 8 bit mode
1
1
3:1 ADPCM 2.6 to 8 bit mode
Bit 0 0
1
normal
the first ADPCM block with reference byte
*72h 4:1 ADPCM 2 to 8 bit normal DMA output
a. ESP_WRITE(72h)
b. ESP_WRITE(length.low)
c. ESP_WRITE(length.high)
Length = # of byte transfer - 1
ESP will generate an interrupt after the specified size of data transferred.
*73h first 4:1 ADPCM 2 to 8 bit normal DMA output
a. ESP_WRITE(73h)
b. ESP_WRITE(length.low)
c. ESP_WRITE(length.high)
Length = # of byte transfer - 1
ESP will generate an interrupt after the specified size of data transferred.
74h 2:1 ADPCM 4 to 8 bit normal DMA output
a. ESP_WRITE(74h)
b. ESP_WRITE(length.low)
c. ESP_WRITE(length.high)
Length = # of byte transfer - 1
ESP will generate an interrupt after the specified size of data transferred.
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ALS300