National Instruments 653 Series User Manual page 88

Chapter 3 Timing Diagrams
Initial State: ACK Cleared
When REQ
Asserted
Wait Wait
Programmable
For For
Delay
REQ Space
Send When 6533 Device has
ACK Pulse space for data, input data.*
Clear
Programmable
ACK
Delay
Pulse
Wait
When REQ
For
Unasserted
* With REQ-edge latching enabled, the data input
REQ
is from the last active-going REQ edge.
Figure 3-33. Long-Pulse Input State Machine
© National Instruments Corporation 3-33 NI 653X User Manual