YMF744B Datasheet, PDF (45/60 Pages) List of Unclassifed Manufacturers – DS-1S

YMF744B
3-2. D-DMA
DS-1S provides the following registers to support D-DMA. D-DMA Slave Configuration Register (4C-
4Dh) of the PCI Configuration register is used to set the Base address of the Slave Address.
Slave Address R/W Register Name
Base + 0h
W Base Address 0-7
Base + 0h
R Current Address 0-7
Base + 1h
W Base Address 8-15
Base + 1h
R Current Address 8-15
Base + 2h
W Base Address 16-23
Base + 2h
R Current Address 16-23
Base + 3h
W Base Address 24-31
Base + 3h
R Current Address 24-31
Base + 4h
W Base Word Count 0-7
Base + 4h
R Current Word Count 0-7
Base + 5h
W Base Word Count 8-15
Base + 5h
R Current Word Count 8-15
Base + 6h
W Base Word Count 16-23
Base + 6h
R Current Word Count 16-23
Base + 7h
N/A Reserved
Base + 8h
W Command
Base + 8h
R Status
Base + 9h
W Request
Base + Ah
N/A Reserved
Base + Bh
W Mode
Base + Ch
W Reserved
Base + Dh
W Master Clear
Base + Eh
N/A Reserved
Base + Fh R/W Multi-Channel Mask
These registers can be accessed by 8-bit or 16-bit bus width.
DS-1S supports 8-bit DMA transfer only.
February 3, 1999
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