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YMF721 Datasheet(PDF) 13 Page - LSI Computer Systems |
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YMF721 Datasheet(HTML) 13 Page - LSI Computer Systems |
13 / 41 page YMF721 July 10, 1997 - 13 - <Power Down Sequence> (1) Power Down in When YMF721 (OPL4-ML2) has received the System Exclusive Message shown above, it goes into the global power down mode after performing the processes as described in "5-1-1. ISA BUS Connect System". (2) Power Down out Since the clock generation has been disabled, YMF721 (OPL4-ML2) is not able to recover from the global power down mode by using the System Exclusive Message. Thus, the LSI needs to receive the "3byte MIDI data" as shown below to recover from the global power down mode. To resume normal operation through the recovery sequence, waiting time of 50 to 100 msec is required before the oscillation of crystal stabilizes when internal oscillation is used, or 3 msec or more before the recovery of clock generated in the synthesizer. <Micro-processor Reset> The internal microprocessor is reset by receiving the above System Exchange Message. 5-2. Suspend/Resume mode The state of internal processor is suspended by writing "E0h" into the command register before turning off the power. When the power has been turned on, it can be resumed by resetting it, writing "E1h" into the command register and then writing data that has been read before suspended. On FM synthesizer block, check setting KON bit to "0" for all channels before reading out all register and turning off the power. Write register that has been read after turning on and resetting at the recovery sequence. For the details of suspend/resume, refer to 6-3. Note : The system that includes YMF721 not connected with ISA bus can not support the suspend/resume function. <Power Down out> <Power Down in> System Exclusive : F0h, 43h, 79h, 04h,0Eh, 6Dh, F7h receiving MIDI F8h receiving MIDI E0h (wait time ~100 msec) all clock (X’tal)disable Synthesizer clock disable Synthesizer clock enable Normal Operation Power down sequence without ISA bus receiving MIDI F8h ~30msec ~3msec |
Similar Part No. - YMF721 |
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Similar Description - YMF721 |
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