National Instruments 653X Manuale Utente

© National Instruments Corporation

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.