National Instruments 653X Manuale Utente

Figure 3-27.  Leading Edge Input State Machine

Wait

For

Space

Wait

For

REQ

Programmable

Delay

Programmable

Delay

Wait

For

REQ

When REQ

Asserted

When 6533 Device has space

for data, input data.*

Clear

ACK

Pulse

When REQ

Unasserted

Initial State: ACK Cleared

Send

ACK

Pulse

* With REQ-edge latching enabled, the data input

is from the last active-going REQ edge.