YMF754-R datasheet(35/60 Pages) YAMAHA

35 / 60 page

YMF754

June 28, 1999

-35-

2-2. Sound Blaster Pro Block

Sound Blaster Pro block emulates the DSP commands of Sound Blaster and Sound Blaster Pro.

Only

playback functions are supported (record functions are not supported).

However, to maintain

compatibility for games, it is designed so that every DSP command receives a correct response.

The DMA transfer of this block uses PC/PCI or D-DMA protocol.

The following shows the SBBase I/O map of SB Pro.

SBBase

(R)

FM Synthesizer Status port

SBBase

(W)

FM Synthesizer Address port for Register Array 0

SBBase+1h

(R/W)

FM Synthesizer Data register

SBBase+2h

(W)

FM Synthesizer Address port for Register Array 1

SBBase+3h

(R/W)

FM Synthesizer Data port

SBBase+4h

(R/W)

SB Mixer Address port

SBBase+5h

(R/W)

SB Mixer Data port

SBBase+6h

(W)

SB DSP Reset port

SBBase+8h

(R)

FM Synthesizer Status port

SBBase+8h

(W)

FM Synthesizer Address port for Register Array 0

SBBase+9h

(R/W)

FM Synthesizer Data port

SBBase+Ah

(R)

DSP Read Data port

SBBase+Ch

(R)

DSP Write-buffer status port

SBBase+Ch

(W)

DSP Write Command/Data port

SBBase+Eh

(R)

DSP Read-buffer status port

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