National Instruments 653X - Manual (Page 84)

Chapter 3 Timing Diagrams
© National Instruments Corporation 3-33 653X User Manual
Figure 3-30. Leading Edge Output State Machine
Wait
For
Data
Wait
For
REQ
Programmable
Delay
Programmable
Delay
Wait
For
REQ
When REQ
Asserted
Clear
ACK
Pulse
When REQ
Unasserted
Initial State: ACK Cleared
When 653 X Device has
data to output, output data.*
Send
ACK
Pulse
* With REQ-edge latching enabled, the data output is
delayed until the next inactive-going REQ edge.