YMF715E Datasheet, PDF (39/54 Pages) YAMAHA CORPORATION – OPL3 Single-chip Audio System 3

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i) Scan Out
ii) Scan In
SBPDA=0
: not ready for scanning
internal state data
SBPDA=0
: not ready for scanning
internal state data
SBPDR=1
: inhibit further DMA,
internal state shutdown
SBPDR=1
: inhibit further DMA,
internal state shutdown
SBPDA=1
: ready for scanning
internal state data
SBPDA=1
: ready for scanning
internal state data
SM=1
SS=1
: internal state read out
: reading internal state
SM=0
SS=1
: internal state write in
: writing internal state
SE=1Ë 0
Scan Data (Read)
: shifting internal state
scan data out 1-bit at a time
8 times
Scan Data (Write)
SE=1Ë 0
: internal state
scan data out
N times
: internal state
scan data in
: shifting internal state
scan data in 1-bit at a time
8 times
N times
Suspend Prepareration
SM=0
SS=0
SBPDR=0
Resume Completion
N=29 byte (Total Scan Data=228 bit (28 byteÊ·8+4bit))
Fig. 9-1 Sound Blaster compatibility Internal State Scan out/in Sequence
May 21, 1997
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