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YMF721 데이터시트(PDF) 12 Page - LSI Computer Systems

부품명 YMF721
상세설명  FM Wavetable Synthesizer LSI
PDF  41 Pages
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제조업체  LSI [LSI Computer Systems]
홈페이지  http://www.lsicsi.com
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YMF721 데이터시트(HTML) 12 Page - LSI Computer Systems

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YMF721
July 10, 1997
- 12 -
5-1-2. No ISA BUS Connect System
When YMF721 (OPL4-ML2) is not connected with ISA bus, power down operation can be controlled
by sending Yamaha's original System Exclusive Message as the MIDI data. The System Exclusive
Message includes the following three byte ID.
43h, 79h, 04h : Yamaha YMF721(OPL4-ML2) ID
The System Exclusive Message is as follows.
F0h, <Yamaha YMF721(OPL4-ML2) ID>, <Command>, <Data>, F7h
YMF721 (OPL4-ML2) supports the following commands and data.
Command
Data
Function
0Eh
6Dh
Power Down Command
0Fh
6Bh
Internal Micro-processor Reset Command
<Power Down out>
<Power Down in>
Command write “FDh”
Control write PDY=1, PDX=0
(wait time ~100 msec)
Control write PDY=0, PDX=0
all clock (X’tal)disable
Synthesizer clock disable
Synthesizer clock enable
~30msec
~3msec
Status read GBUSY=0
Normal Operation
Power down sequence when connected with ISA bus



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