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

Signal Connections

Mode 1 Input Timing

The timing specifications for an input transfer in Mode 1 are as follows:
STB *
IBF
INTR
RD *
DATA
Name Description
T1 STB* pulse width
T2 STB* = 0 to IBF = 1
T3 Data before STB* = 1
T4 STB* = 1 to INTR = 1
T5 Data after STB* = 1
T6 RD* = 0 to INTR = 0
T7 RD* = 1 to IBF = 0
All timing values are in nanoseconds.
Lab-PC+ User Manual
T1
T2 T4
T3 T5
Minimum
500
–
0
–
180
–
–
3-18
T7
T6
Maximum
–
300
–
300
–
400
300
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Chapter 3