ymf740c ETC-unknow, ymf740c Datasheet - Page 27

• Manufacturer Part Number: ymf740c
• Description: Ds-1l
• Manufacturer: ETC-unknow

YMF740C
2-2. Sound Blaster Pro Block
This 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 protocol.
The following shows the SBBase I/O map of SB Pro.
SBBase
SBBase
SBBase+1h
SBBase+2h
SBBase+3h
SBBase+4h
SBBase+5h
SBBase+6h
SBBase+8h
SBBase+8h
SBBase+9h
SBBase+Ah
SBBase+Ch
SBBase+Ch
SBBase+Eh
(R)
(W)
(R/W)
(W)
(R/W)
(W)
(R/W)
(W)
(R)
(W)
(R/W)
(R)
(R)
(W)
(R)
FM Synthesizer Status port
FM Synthesizer Address port for Register Array 0
FM Synthesizer Data register
FM Synthesizer Data port
SB Mixer Data port
SB DSP Reset port
FM Synthesizer Status port
FM Synthesizer Data port
DSP Write-buffer status port
DSP Write Command/Data port
FM Synthesizer Address port for Register Array 1
SB Mixer Address port
FM Synthesizer Address port for Register Array 0
DSP Read Data port
DSP Read-buffer status port
-27-
January 14, 1999