ALS300 Datasheet, PDF (38/66 Pages) List of Unclassifed Manufacturers – Media Audio Controller SPEC

Avance Logic Inc.
ALS300
Bit 0 X
reserved
FIFO will reset when ESP receives any digital audio I/O command.
FIFO is always on.
a. ESP_WRITE(CXh)
b. ESP_WRITE(mode)
c. ESP_WRITE(length.low)
d. ESP_WRITE(length.high)
Mode
Bit 7 X
Bit 6 X
Bit 5 0
1
Bit 4 0
1
Bit 3 X
Bit 2 X
Bit 1 X
Bit 0 X
reserved
reserved
MONO
stereo
unsigned (0--80h--FFh)
signed (80h--0--7Fh)
reserved
reserved
reserved
reserved
Length = # of 8 bit sample -1
ESP will generate an interrupt after the specified size of data transferred (if non-continuous) or every
block(if continuous).
Control DMA And Digital Audio
DXh
D0h pause non BX type DMA transfer
ESP_WRITE(D0h)
The DMA request is stopped after this command. Internal FIFO will continue until the FIFO is empty
(playback) or full (record). The DMA request will resume after command D4h or any of new DMA
command is issued.
D1h turn digital audio on
ESP_WRITE(D1h)
Set digital audio status flag for D8h command.
D3h turn digital audio off
ESP_WRITE(D3h)
Reset digital audio status flag for D8h command.
Audio status flag is reset after system reset or ESP_RESET().
D4h resume non BX type DMA transfer
ESP_WRITE(D4h)
The DMA request that is suspended by the command D0h is enable again. The internal FIFO is working
as usual in pause or resume DMA mode.
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