YMF740C Datasheet, PDF (25/44 Pages) List of Unclassifed Manufacturers – DS-1L

YMF740C
2-1. FM Synthesizer Block
FM Synthesizer Block is register compatible with YMF289B. However, Power Management register
has been deleted because it is now controlled by the PCI Configuration Register.
The following shows the FMBase I/O map of FM Synthesizer.
FMBase
(R)
Status Register port
FMBase
(W)
Address port for Register Array 0
FMBase+1
(R/W) Data port
FMBase+2
(W)
Address port for Register Array 1
FMBase+3
(R/W) Data port
The default FMBase value is 0x0388.
The following shows the FM Synthesizer Block registers.
2-1-1. Status Register
FM Synthesizer Status Register (RO):
Address
D7
D6
D5
D4
xxh
IRQ
FT1
FT2
-
D3
D2
D1
D0
-
BUSY
-
BUSY
January 14, 1999
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