YMF744B Datasheet, PDF (42/60 Pages) List of Unclassifed Manufacturers – DS-1S

YMF744B
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
: not ready for scanning
internal state data
ii) Scan In
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=1 -> 0
Scan Data (Read)
: shifting internal state
scan data out 1-bit at a time
8 times
Scan Data (Write)
SE=1 -> 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 Preparation
SM=0
SS=0
SBPDR=0
Resume Completion
N = 34 byte (Total Scan Data = 268 bit (33 byte x 8 + 4 bit))
February 3, 1999
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