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Chapter 3
Timing Diagrams
When REQ Unasserted,
Latch Input Data
Wait
For
REQ
When REQ
Asserted
653X User Manual
Programmable
Delay
Clear
ACK
Wait
For
REQ
Initial State:
ACK Set
Figure 3-10. 8255 Emulation Input State Machine
Wait
For
Space
When 6533 Device has
space for data, input data.
Send
ACK
3-14
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