Chapter 3 Signal Connections
PC-DIO-24/PnP User Manual 3-14
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National Instruments Corporation
Mode 2 Bidirectional Timing
The following figure illustrates the timing specifications for
bidirectional transfers in mode2.
Figure 3-7. Mode 2 Timing Specification for Bidirectional Transfers
Name Description Minimum Maximum
T1 WR* = 1 to OBF* = 0 —150
T2 Data before STB*= 1 20 —
T3 STB* pulse width 100 —
T4 STB* = 0 to IBF = 1 —150
T5 Data after STB* = 1 50 —
T6 ACK* = 0 to OBF = 1 —150
T7 ACK* pulse width 100 —
T8 ACK* = 0 to output —150
T9 ACK* = 1 to output float 20 250
T10 RD* = 1 to IBF = 0 —150
All timing values are in nanoseconds.
T2
T1
WR*
OBF*
INTR
ACK*
DATA
T6
T7
T3
T4 T10
STB*
T9
T8
T5
IBF
RD*