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YMF715E
May 21, 1997
-33-
Notice)
1) Set D7, D6, D4 and D3 bits to “0”.
2) In the power save modes 1, 2, the OUTL/R pins will keep the VREF voltage. In the power down
mode, VREF voltage slowly decays to ground on transition into this mode, and quickly returns to
VREF on transition from this mode. During these modes (power save/down), master volume is
automatically muted, so all audio sources cannot be heard. After resuming these modes, master
volume is still muted.
3) The Joystick portion must be re-initialized by writing any value to the Joystick port after resuming
from the power down/save mode.
System control (R/W):
Index D7 D6 D5 D4 D3 D2 D1 D0
02h SBHE - YMODE1 YMODE0 - IDSEL1 IDSEL0 VZE
SBHE... When AT-bus is used, set to “0” and set to “1” in case of XT-bus.
YMODE1-0... 3D Enhancement mode according to the application can be selected
by these two bits as follows.
YMODE1 YMODE0 3D Enhancement mode
0 0 Desktop mode
0 1 Notebook PC mode (1)
1 0 Notebook PC mode (2)
1 1 Hi-Fi mode
IDSEL1, IDSEL0... These two bits specify the DSP version of Sound Blaster compatible
portion.
The different return value of DSP command E1h (Get DSP version
number) of Sound Blaster Pro is got by these bits in.
1st byte 2nd byte
IDSEL1 IDSEL0 (major ver) (minor ver)
0 0 03h 01h
0 1 02h 01h
1 0 01h 05h
1 1 00h 00h
VZE... I
2
S audio format can be fed to BCLK_ZV, LRCK_ZV, SIN_ZV pins
of OPL3-SA3 by setting this bit to “1” regardless of the /EXTEN,
when Zoomed Video port is in use.
default : 00h
Notice)
Input signals, BCLK_ZV and LRCK_ZV pins which appear on SEL=4 or 5 mode, should be
oscillated, when VZE=1.