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YMF721 Datasheet(PDF) 12 Page - LSI Computer Systems |
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YMF721 Datasheet(HTML) 12 Page - LSI Computer Systems |
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12 / 41 page  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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