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YMF715E
May 21, 1997
-6-
FUNCTION OVERVIEW
1. Multi-purpose pin
1-1. Multi-purpose function
OPL3-SA3 can support the various functions listed below by programming SEL2-0 pins.
A. 16-bit address decode
B. EEPROM interface
C. Zoomed video port
D. CPU and DAC interface for OPL4-ML/ML2
E. MODEM interface
F. IDE CD-ROM interface
Following table shows what combinations of the above functions are available for each SEL2-0 pins.
SEL 16bit Dec. EEPROM ZV port
OPL4-ML/ML2
MODEM CDROM Remark
0 - - - - - - Test mode
1
(*1)
-
(*2) (*1)
S/C,C/C
(
add-in
)
2 -
(*3)
-S/C
(
add-in
)
3
(*4)
- --S/C
(
add-in
)
4
(*4)
- - - Note PC
5 -
(*3)
- Note PC
6 - - - - - - reserved
7 -- - - M/B, Note PC
Where,
S/C : Sound Card
C/C : Combo Card (Sound and Modem)
M/B : Desktop Mother Board
SEL=0 SEL=1 SEL=2 SEL=3 SEL=4 SEL=5 SEL=6 SEL=7
SEL0 pin01010101
SEL1 pin00110011
SEL2 pin00001111
Notice
*1 : External PAL is needed.
*2 : External wavetable synthesizer (ex.OPL4-ML/ML2) is mixed as analog signal using external
DAC.
*3 : Clock module (ex.MK1420) is used to generate the clock for OPL4-ML/ML2 and it will be
mixed analog signal by having an additional DAC.
*4 : External TTLs (ex.LS138) is needed.
See section 1-2 and 1-3 for implementation detail.