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Rev. 1.00, 05/04, page 400 of 544
Table 15.4 Fast A20 Gate Output Signals
HA0 Data/Command
Internal CPU
Interrupt Flag
(IBF)
GA20
(P81)
Remarks
1 H'D1 command 0 Q
0 1 data*
1
0 1
1 H'FF command 0 Q (1)
Turn-on sequence
1 H'D1 command 0 Q
0 0 data*
2
0 0
1 H'FF command 0 Q (0)
Turn-off sequence
1 H'D1 command 0 Q
0 1 data*
1
0 1
1/0 Command other than H'FF and H'D1 1 Q (1)
Turn-on sequence
(abbreviated form)
1 H'D1 command 0 Q
0 0 data*
2
0 0
1/0 Command other than H'FF and H'D1 1 Q (0)
Turn-off sequence
(abbreviated form)
1 H'D1 command 0 Q
1 Command other than H'D1 1 Q
Cancelled sequence
1 H'D1 command 0 Q
1 H'D1 command 0 Q
Retriggered
sequence
1 H'D1 command 0 Q
0 Any data 0 1/0
1 H'D1 command 0 Q (1/0)
Consecutively
executed sequences
Notes: 1. Arbitrary data with bit 1 set to 1.
2. Arbitrary data with bit 1 cleared to 0.