Fujitsu MB86R02 Jade-D Hardware Manual page 595

MB86R02 'Jade-D' Hardware Manual V1.64
Bit 14 NF (FIFO Near Full)
Indicates free space in display list FIFO (DFIFOD)
0
1
Bit 20 to 15 FCNT (FIFO Counter)
Indicates count of free stages (0 to 011111
Bit 24 FO (FIFO Overflow)
Indicates whether FIFO overflow occurred
0
1
More than half of DFIFOD free
Less than half of DFIFOD free
Normal
FIFO overflow
) of display list FIFO (DFIFOD)
B
18-237