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Chapter 3 Signal Connections
PCI-1200 User Manual 3-30 © National Instruments Corporation
Mode 2 Bidirectional Timing
The timing specifications for bidirectional transfers in mode 2 are as
follows:
Figure 3-19.
Mode 2 Timing Specifications for Bidirectional Transfers
Name Description Minimum Maximum
T1
WRT* = 1 to OBF* = 0
— 650
T2
Data before STB* = 1
0 —
T3
STB* pulse width
500 —
T4
STB* = 0 to IBF = 1
— 300
T5
Data after STB* = 1
180 —
T6
ACK* = 0 to OBF* = 1
— 350
T7
ACK* pulse width
300 —
T8
ACK* = 0 to output
— 300
T9
ACK* = 1 to output float
20 250
T10
RD* = 1 to IBF = 0
— 300
All timing values are in nanoseconds.
T1
T6
T7
T3
T4
T10
T2
T5
T8
T9
WRT *
OBF *
INTR
ACK *
STB *
IBF
RD *
DATA