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Chapter 3 Signal Connections
PC-DIO-24/PnP User Manual 3-14
©
National Instruments Corporation
Mode 2 Bidirectional Timing
The following figure illustrates the timing specifications for
bidirectional transfers in mode 2.
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*