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Chapter 5 Signal Timing
DIO 6533 User Manual 5-12 © National Instruments Corporation
Figure 5-10. Level-ACK Mode Input Timing
Parameter Description Minimum Maximum
Input Parameters
t
rr*
REQ pulse width
75 —
t
r*r
REQ inactive duration
75 —
t
ar
ACK to next REQ
0—
t
dir(1)
Input data setup to REQ active
(with REQ-edge latching)
0—
t
rdi
Input data hold from REQ active
(with REQ-edge latching)
10 —
t
dir(2)
Input data setup to REQ
(with REQ-edge latching disabled)
0—
t
adi
Input data hold from ACK
(with REQ-edge latching disabled)
0—
Output Parameters
t
aa*
ACK pulse width
225 —
t
ra*
REQ to ACK inactive
100 200
All timing values are in nanoseconds.
REQ
ACK
Input Data
(REQ-edge latching)
Input Data
(REQ-edge
latching disabled)
t
r*r
t
ra*
t
dir(2)
t
adi
t
ar
t
aa*
t
rr*
t
rdi
t
dir(1)