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Chapter 4 Signal Connections
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National Instruments Corporation 4-29 PCI-6023E/6024E/6025E User Manual
Mode 2 Bidirectional Timing
Timing specifications for a bidirectional transfer in mode 2 are as follows:
Figure 4-15.
Timing Specifications for Mode 2 Bidirectional Transfer
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.
T1
T6
T7
T3
T4
T10
T2
T5
T8
T9
WR *
OBF *
INTR
ACK *
STB *
IBF
RD *
DATA
PCI.book Page 29 Wednesday, September 16, 1998 9:09 AM