National Instruments 653X User Manual page 70

Chapter 3 Timing Diagrams
Initial State: ACK Cleared
When REQ
Asserted
Wait Wait
Programmable
For For
Delay
REQ Space
Clear ACK
When 6533 Device has space
for data, input data.*
Programmable
Delay
Send
ACK
Wait
When REQ
For
Unasserted
* With REQ-edge latching enabled, the data input
REQ
is from the last active-going REQ edge.
Figure 3-15. Level ACK Input State Machine
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