National Instruments 653X user manual t, t t

Chapter 3 Timing Diagrams
653X User Manual 3-20 ni.com
Figure 3-16. Level ACK Input Timing Diagram
Parameter Description Minimum Maximum
Input Parameters
trr* REQ pulse width 75 —
tr*r REQ inactive duration 75 —
tar ACK to next REQ 0 —
tdir(1) Input data setup to REQ active
(with REQ-edge latching)
0—
trdi Input data hold from REQ active
(with REQ-edge latching)
10 —
tdir(2) Input data setup to REQ
(with REQ-edge latching disabled)
0—
tadi Input data hold from ACK
(with REQ-edge latching disabled)
0—
Output Parameters
taa* ACK pulse width 225 —
tra* REQ to ACK inactive 100 200
All timing values are in nanoseconds.
REQ
Input Data Valid
(REQ-edge
latching)
Input Data Valid
(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)
ACK
ACK and REQ are shown as active high