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YMF715E
May 21, 1997
-40-
Digital Block Partial Power Down (R/W):
Index D7 D6 D5 D4 D3 D2 D1 D0
12h JOY MPU MCLKO FM WSS_R WSS_P SB PnP
This register specifies the partial power management of the digital portion. This function is
to spare power dissipation in unneeded blocks.
JOY... Setting this bit to “1” makes the Joystick portion in power down mode. Note
that the Joystick portion must be re-initialized by writing any value to the
Joystick port after resuming from the Joystick portion power down mode.
MPU... Setting this bit to “1” makes the MPU401 portion in power down mode.
MCLKO when set to “1”, Master Clock(33.8688MHz) is disable, which appears on
the pin MP9(SEL=1,3,4,7).
when set to “0”, normal operation is active.
FM... Setting this bit to “1” makes the internal FM(OPL3) portion in power down
mode.
WSS_R... Setting this bit to “1” makes the WSS recording portion in power down
mode.
WSS_P... Setting this bit to “1” makes the WSS playback portion and the digital
loopback portion in power down mode.
SB... Setting this bit to “1” makes the Sound Blaster compatible portion in power
down mode.
PnP... Setting this bit to “1” makes the PnP portion in power down mode.
default : 00h
Analog Block Partial Power Down (R/W):
Index D7 D6 D5 D4 D3 D2 D1 D0
13h - - - FMDAC A/D D/A SBDAC WIDE
This register specifies the partial power management of the analog portion. The respective
outputs of the blocks which are to be disabled should be muted beforehand.
FMDAC... Setting this bit to “1” makes the FMDAC portion for the internal FM(OPL3)
or external synthesizer(OPL4-ML/ML2) or ZV port etc. in power down
mode. AUX2 should be muted via register before setting the FMDAC
portion to power down.
A/D... Setting this bit to “1” makes the A/D portion for the WSS recording in
power down mode.
D/A... Setting this bit to “1” makes the D/A portion for the WSS playback in power
down mode. WSS CODEC indirect register, index 06h and 07h, LOM and
ROM bits must be “1”, before doing this.
SBDAC... Setting this bit to “1” makes the SBDAC portion in power down mode. SB
master volume should be muted via register before setting the SBDAC
portion to power down.
WIDE... Setting this bit to “1” makes the Wide Stereo(3D Enhanced Control) portion
in power down mode. The 3D Enhanced parameter registers at index 14, 15,
and 16h must be 00h, when doing this.
default : 00h