National Instruments PCI-1200 Manual De Usuario

© National Instruments Corporation

The timing specifications for bidirectional transfers in mode 2 are as 
follows: 

Figure 3-19.  Mode 2 Timing Specifications for Bidirectional Transfers

T1

WRT* = 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.

T1

T6

T7

T3

T4

T10

T2

T5

T8

T9

WRT *

OBF *

INTR

ACK *

STB *

IBF

RD *

DATA