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Configuration and Installation Chapter 2
Lab-NB User Manual 2-16 © National Instruments Corporation
Mode 2 Bidirectional Timing
The following figure illustrates the timing specifications for bidirectional transfers in mode 2.
T1
T6
T7
T3
T4
T10
T2
T5
T8
T9
WR *
OBF *
INTR
ACK *
STB *
IBF
RD *
DATA
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.