Testbench doubt

[VHDL User]

Hi all,
Suppose I want to write a testbench for a design that simulates the
design for a suffciently long time,so that wait for <t> statements are
obv. inadequate .Will a statement
wait;
do the job?
as in causing simulation to run forever?
An y other ideas as to how a long simulation time may be met ?

 

[Mike Treseler]

VHDL User wrote

An y other ideas as to how a long simulation time may be met ?

The simulation will continue until
all processes reach a wait statement.

If one process, say the simulation clock,
never reaches a wait, the simulation
will run indefinitely.

-- Mike Treseler

 

[Niels Bakker]

Mike Treseler wrote:

VHDL User wrote

An y other ideas as to how a long simulation time may be met ?


The simulation will continue until
all processes reach a wait statement.

If one process, say the simulation clock,
never reaches a wait, the simulation
will run indefinitely.

-- Mike Treseler

If all your processes are synchronous, and suppose your clock signal is
called 'clk' and of type std_logic.

Use a boolean signal 'simulate' as follows:

....
simulate <= true, false after 2 ms;
clk <= NOT clk after 5 ns WHEN simulate ELSE '0';
....

Your simulation will end after 2 ms, since the clock stops running and
there are no other stimuli left.

Niels Bakker