User`s guide

Definin

a Di

ital Stimulus 14

-19

The following steps set up the U2 stimulus so that the 74393

counter is cleared after 40 nsec have elapsed in a transient

analysis:

Create a stimulus file named, for instance,

reset.stm:

Reset

0ns 1

40ns 0

The header line contains the names of all signals described

in the file. In this case, there is only one: Reset.

The remaining lines are the state transitions output for the

signals named in the header. In this case, the Reset signal

remains at state 1 until 40 nsec have elapsed, at which time

it drops to state 0.

Associate this file with the digital stimulus instance, U2, by

setting U2’s FILENAME attribute to

reset.stm.

Define the signal named Reset in

reset.stm as the output

of U2 by setting U2’s SIGNAME attribute to Reset. Since

the labeled wire connecting U2 with the 74393 counter is

also named Reset, it is also acceptable to leave SIGNAME

undefined.

Select Library and Include Files from the Analysis menu,

and configure

reset.stm as an include file.

ure 14-1

Schematic Fragment with FILESTIM

A blank line is required between

the si

nal name list and the first

transition.