YMF754-R datasheet(45/60 Pages) YAMAHA

45 / 60 page

YMF754

June 28, 1999

-45-

3-2. D-DMA

DS-1E 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

Base + 0h

Base Address 0-7

Base + 0h

Current Address 0-7

Base + 1h

Base Address 8-15

Base + 1h

Current Address 8-15

Base + 2h

Base Address 16-23

Base + 2h

Current Address 16-23

Base + 3h

Base Address 24-31

Base + 3h

Current Address 24-31

Base + 4h

Base Word Count 0-7

Base + 4h

Current Word Count 0-7

Base + 5h

Base Word Count 8-15

Base + 5h

Current Word Count 8-15

Base + 6h

Base Word Count 16-23

Base + 6h

Current Word Count 16-23

Base + 7h

N/A

Reserved

Base + 8h

Command

Base + 8h

Status

Base + 9h

Request

Base + Ah

N/A

Reserved

Base + Bh

Mode

Base + Ch

Reserved

Base + Dh

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-1E supports 8-bit DMA transfer only.

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