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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Yamaha YMF724F specifications Dma