Yamaha YMF744B (DS-1S) 2-1. FM Synthesizer Block

YMF744B
February 3, 1999
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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 por t
FMBase (W) Address port for Register Arr a y 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 B l ock registers.
2-1-1. Status Register
FM Synthesizer Status Register (RO):
AddressD7D6D5D4D3D2D1D0
xxh IRQ FT1 FT2 - - BUSY - BUSY