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YMF715E
May 21, 1997
-8-
1-3. System Block Diagram
(1) SEL=1 (Sound Card and Combo Card Add-in)
1. External PAL(16V8 etc.)
(i) connect the signal AEN* generated by decoding SA15-12 and AEN to the AEN of OPL3-
SA3.
(ii) generate the /G(enable) signal for Data Bus Buffer (LS245) by decoding the /CDCS1-0 and
SA2-0.
(iii) generate the /RESET signal from RESETDRV.
MODEM I/F
SD15-8
/
ENH
SA2-0
SA15-12
/
RESET
AEN
245
IDE CD-ROM I/F
16V8
RESETDRV
245
YMF715E-S
(OPL3-SA3)
EEPROM
YAC516
OPL4-ML/ML2
/
ENL
CDIRQ
AEN*
/CDCS1
/CDCS0
/
IOW,/IOR
RESET
AUX2L
AUX2R
XI
RXD
BCO
CLKO
DO2
LRORESET
/IOW,/IOR
A11-0
SA11-0
D7-0
SD7-0
SD7-0
MP8
AEN
MP7
MP6
MP0
MP1
/
MCS
MIRQ
MP3
MP2
TXD
MP9
MP5
TXD
CLKO
MP4
ROMDO
ROMDI
ROMCS
ROMCL
K
}