National Instruments Low-Cost Multifunction I/O Board for ISA Lab-PC+ - Manual (Page 51)

Signal Connections Chapter 3
Lab-PC+ User Manual 3-20 © National Instruments Corporation
Mode 2 Bidirectional Timing
The timing specifications for bidirectional transfers in Mode 2 are as follows:
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 – 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.