Simulation problem in VHDL Simili from Symphony EDA package.

[Daniel]

How do I simulate CLOCK signal?

I'm previous user of ActiveHDL where I could simply choose "stimulators" -
clk, hotkey, forse '0', '1',...

I can't find anything like this in VHDL Simili's Sonata simulator.

Do I have to write a code for CLK signal? I read the official docs, but
couldn't find any information about this,...

Thanks.

 

[Ajeetha]

Your best bet will be to write one line code inside your "testbench"
as:

signal clock : std_logic := '0';
.....
clock <= not clock after 10 ns;

HTH
Ajeetha, CVC
www.noveldv.com

Daniel wrote:

How do I simulate CLOCK signal?

I'm previous user of ActiveHDL where I could simply choose "stimulators" -
clk, hotkey, forse '0', '1',...

I can't find anything like this in VHDL Simili's Sonata simulator.

Do I have to write a code for CLK signal? I read the official docs, but
couldn't find any information about this,...

Thanks.

 

[Andy]

You've just hit upon the main reason not to use such simulator commands
for stimulus: they're not portable between different simulators!

Better to stimulte from a vhdl testbench wrapper around your
unit-under-test, with a signal assignment such as:

signal clk : std_logic := '1'; -- init val is ok for sim!
signal stop : boolean := false;
constant clk_prd : time : 10 ns; -- change as requiresd
constant sim_time : time := 100 * clk_prd; -- change as required
....
clk <= not clk after clk_prd / 2 when not stop;

stop <= true after sim_time; -- stop clock

This will work from any vhdl simulator.

Andy


Daniel wrote:

How do I simulate CLOCK signal?

I'm previous user of ActiveHDL where I could simply choose "stimulators" -
clk, hotkey, forse '0', '1',...

I can't find anything like this in VHDL Simili's Sonata simulator.

Do I have to write a code for CLK signal? I read the official docs, but
couldn't find any information about this,...

Thanks.

 

[pitarda]

I will take you advice and try to write the code this way.

Thanks.


Andy je napisal:

You've just hit upon the main reason not to use such simulator commands
for stimulus: they're not portable between different simulators!

Better to stimulte from a vhdl testbench wrapper around your
unit-under-test, with a signal assignment such as:

signal clk : std_logic := '1'; -- init val is ok for sim!
signal stop : boolean := false;
constant clk_prd : time : 10 ns; -- change as requiresd
constant sim_time : time := 100 * clk_prd; -- change as required
...
clk <= not clk after clk_prd / 2 when not stop;

stop <= true after sim_time; -- stop clock

This will work from any vhdl simulator.

Andy


Daniel wrote:
How do I simulate CLOCK signal?

I'm previous user of ActiveHDL where I could simply choose "stimulators" -
clk, hotkey, forse '0', '1',...

I can't find anything like this in VHDL Simili's Sonata simulator.

Do I have to write a code for CLK signal? I read the official docs, but
couldn't find any information about this,...

Thanks.