Figure 3-30. leading edge output state machine – National Instruments 653X User Manual
Page 84
Chapter 3
Timing Diagrams
© National Instruments Corporation
3-33
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.
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