Mode 1 Output Timing - National Instruments Low-Cost Multifunction I/O Board for ISA Lab-PC+ User Manual

Chapter 3

Mode 1 Output Timing

The timing specifications for an output transfer in Mode 1 are as follows:
WR*
OBF*
INTR
ACK*
DATA
Name Description
T1 WR* = 0 to INTR = 0
T2 WR* = 1 to output
T3 WR* = 1 to OBF* = 0
T4 ACK* = 0 to OBF* = 1
T5 ACK* pulse width
T6 ACK* = 1 to INTR = 1
All timing values are in nanoseconds.
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T3
T1
T2
Minimum
–
–
–
–
300
–
3-19
Signal Connections
T4
T6
T5
Maximum
450
350
650
350
–
350
Lab-PC+ User Manual