YMF754-R datasheet(41/60 Pages) YAMAHA

41 / 60 page

YMF754

June 28, 1999

-41-

b7................FFEMP: FM Synthesizer Empty

This bit indicates whether or not FIFO followed by the FM Synthesizer is empty.

“0”: not Empty

“1”: Empty

(default)

i) Scan Out

SBPDA=0

SBPDR=1

SBPDA=1

SM=1

SS=1

SE=1 -> 0

: not ready for scanning

internal state data

inhibit further DMA,

internal state shutdown

: ready for scanning

internal state data

: internal state read out

: reading internal state

: shifting internal state

scan data out 1-bit at a time

8 times

N times

: internal state

scan data out

Scan Data (Read)

Suspend Preparation

ii) Scan In

SBPDA=0

SBPDR=1

SBPDA=1

SM=0

SS=1

: not ready for scanning

internal state data

: inhibit further DMA,

internal state shutdown

: ready for scanning

internal state data

internal state write in

: writing internal state

shifting internal state

scan data in 1-bit at a time

8 times

N times

internal state

scan data in

Scan Data (Write)

Resume Completion

SM=0

SS=0

SBPDR=0

N = 34 byte (Total Scan Data = 268 bit (33 byte x 8 + 4 bit))

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