Yamaha OPL3-SA3 specifications YMF715E, i Scan Out

YMF715E

i) Scan Out

ii) Scan In

: not ready for scanning

: not ready for scanning

SBPDA=0

internal state data

SBPDA=0

internal state data

SBPDR=1

: inhibit further DMA,

SBPDR=1

internal state shutdown

: ready for scanning

: inhibit further DMA,

internal state shutdown

: ready for scanning

SBPDA=1

internal state data

SBPDA=1

internal state data

SM=1

SS=1

SE=1→0

: internal state read out					SM=0
: reading internal state					SS=1
	: shifting internal state
			Scan Data (Write)
	scan data out 1-bit at a time
				SE=1→0
		8 times

: internal state write in

: writing internal state

: internal state

scan data in

: shifting internal state

scan data in 1-bit at a time

8 times

N times

Scan Data (Read)	: internal state
	scan data out

Suspend Prepareration SM=0

SS=0

SBPDR=0

Resume Completion

N times

N=29 byte (Total Scan Data=228 bit (28 byte×8+4bit))

Fig. 9-1 Sound Blaster compatibility Internal State Scan out/in Sequence

May 21, 1997

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