Fujitsu MB86R02 Jade-D Hardware Manual page 566

MB86R02 'Jade-D' Hardware Manual V1.64
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Bit 20 to 15 FCNT (FIFO Counter)
Indicates count of empty entries of display list FIFO (0 to 100000
Bit 22 CE (Display List Command Error)
Indicates command error occurrence (Not all error can detect. Requires software reset
or hardware reset for recovery)
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1
Bit 24 FO (FIFO Overflow)
Indicates FIFO overflow occurrence
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18-208
Empty entries equal to or more than half
Empty entries less than half
Normal
Command error detected
Normal
FIFO overflow detected
)
H