Yamaha YMF724F specifications Dma

YMF724F

3-2. D-DMA

DS-1 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-1 supports 8-bit DMA transfer only.

September 21, 1998

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