YMF754 Datasheet, PDF (26/60 Pages) YAMAHA CORPORATION – DS-1E

YMF754
b11..............PSIO: Power Save I/O Pad
Setting this bit to “1” cuts the pull up resistor of the input pins except for the PCI interface and AC-Link.
The input signals keep the level before PSIO bit is set from “0” to “1”. In case the input level is only
“low”, the pull up resistor is cut.
“0”: Normal
(default)
“1”: Cuts the pull up resistor
b12..............PSHWV: Power Save Hardware Volume
Setting this bit to “1” stops a clock supplied to the Hardware Volume block.
“0”: Normal
(default)
“1”: Disable
Master
Clock
(24.576MHz)
DMC
PLL
DPLL
CMCD
PSFM
PSSB
PSMPU
PSJOY
PSPCA
PSSRC
PSZV
PSDIT
PSDIR
PSHWV
PSACL
AC97 Master Clock
FM Synthesizer
SB Pro
MPU401
Joystick
PCI Audio
SRC
ZVport
SPDIF OUT
SPDIF IN
H/W Vol.
AC-link
PCI
Clock
(33MHz)
External Input
PCI I/F
PC/PCI
D-DMA
S-IRQ
EEPROM I/F
PSIO
I/O Pad
Power Management Block
June 28, 1999
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