Mode 2 Bidirectional Timing - National Instruments PC-DIO-96/PnP User Manual

Chapter 3 Signal Connections

Mode 2 Bidirectional Timing

WR*
OBF*
INTR
ACK*
STB*
IBF
RD*
DATA
Name
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
All timing values are in nanoseconds.
PC-DIO-96/PnP User Manual
The following figure illustrates the timing specifications for
bidirectional transfers in mode 2.
T1
T3
T4
T2
Description
WR* = 1 to OBF* = 0
Data before STB* = 1
STB* pulse width
STB* = 0 to IBF = 1
Data after STB* = 1
ACK* = 0 to OBF = 1
ACK* pulse width
ACK* = 0 to output
ACK* = 1 to output float
RD* = 1 to IBF = 0
T6
T7
T5 T9
T8
Minimum
3-16
T10
Maximum
– 150
20 –
100 –
– 150
50 –
– 150
100 –
– 150
20 250
– 150
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