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Chapter 3
Timing Diagrams
When REQ
Unasserted
Wait
For
REQ
Clear ACK
When REQ
Asserted
653X User Manual
Initial State: ACK Cleared
Programmable
Delay
Output Data,
Then Send ACK
Wait
For
REQ
Figure 3-12. 8255 Emulation Output State Machine
3-16
Wait
For
Data
When 6533 Device has
data to output, output data.
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