National Instruments 653X User Manual page 57

Chapter 3 Timing Diagrams
PCLK
ACK
REQ
Data In
Valid
PCLK
ACK
REQ
Data Out
Valid
Since data is transferred only when both the 653X device and the peripheral device
Note
are ready (and thus ACK and REQ are asserted), it is not reasonable to expect data to arrive
at consistent intervals. If consistent intervals are an important criteria for your application,
use pattern I/O.
653X User Manual
D1 D2
Figure 3-3. Burst Transfer Example (Input)
D1 D2
Figure 3-4. Burst Transfer Example (Output)
3-6
D3 D4
D3 D4
D5
= data transfer occurs
D5
= data transfer occurs
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