Mode 2 Bidirectional Timing - National Instruments DAQPad-6508 User Manual

Mode 2 Bidirectional Timing

WR *
OBF *
INTR
ACK *
STB *
IBF
RD *
DATA
Name
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
All timing values are in nanoseconds.
© National Instruments Corporation
The following figure illustrates the timing specifications for bidirectional
transfers in mode 2.
T1
T3
T4
T2
Description
WR* = 1 to OBF* = 0
Data before STB* = 1
STB* pulse width
STB* = 0 to IBF = 1
Data after STB* = 1
ACK* = 0 to OBF = 1
ACK* pulse width
ACK* = 0 to output
ACK* = 1 to output float
RD* = 1 to IBF = 0
T6
T7
T5 T8
Minimum
3-15
Chapter 3 Signal Connections
T10
T9
Maximum
— 150
20 —
100 —
— 150
50 —
— 150
100 —
— 150
20 250
— 150
DAQPad-6507/6508 User Manual