YMF715E Datasheet, PDF (6/54 Pages) YAMAHA CORPORATION – OPL3 Single-chip Audio System 3

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˙ FUNCTION OVERVIEW
1. Multi-purpose pin
ɹ1-1. 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
SEL0 pin
SEL1 pin
SEL2 pin
SEL=0
0
0
0
SEL=1
1
0
0
SEL=2
0
1
0
SEL=3
1
1
0
SEL=4
0
0
1
SEL=5
1
0
1
SEL=6
0
1
1
SEL=7
1
1
1
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.
May 21, 1997
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