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YMF744B
February 3, 1999
-42-
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
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))