National Instruments PC-DIO-96 用户手册

The following figure illustrates the timing specifications for bidirectional transfers in mode 2.

T2

T1

WR*

OBF*

INTR

ACK*

DATA

T6

T7

T3

T4

T10

STB*

T9

T8

T5

IBF

RD*

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.