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Chapter 5 Signal Timing
DIO 6533 User Manual 5-26 © National Instruments Corporation
Figure 5-22. Trailing-Edge Mode Input Timing
Parameter Description Minimum Maximum
Input Parameters
t
rr*
REQ pulse width
75 —
t
r*r
REQ inactive duration
75 —
t
dir*
Input data setup to REQ inactive
(with REQ-edge latching)
0—
t
r*di
Input data hold from REQ inactive
(with REQ-edge latching)
10 —
t
dir
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
1
275
2
t
a*r*
ACK inactive to next REQ inactive
0—
1
t
aa*
(min)
= 225 + programmable delay All timing values are in nanoseconds.
2
t
aa*
(max) = 275 + programmable delay
REQ
ACK
Input Data
(REQ-edge latching)
Input Data
(REQ-edge
latching disabled)
t
dir*
t
r*r
t
dir
t
aa*
t
a*r*
t
rr*
t
r*di
t
adi
t
adi