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lshj98115
Senior
Joined: Sep 06, 2006
Posts: 24
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 Posted: Sun Nov 23, 2008 10:08 pm Post subject: how to check duty cycle? |
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| Is there a system task that can check the duty cycle? |
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lshj98115
Senior
Joined: Sep 06, 2006
Posts: 24
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| Posted: Mon Nov 24, 2008 7:42 am Post subject: |
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malvika:
I think your suggestion is unresonable.
how can you get the duty cycle check by limiting the minimum value ?
| malvika10 wrote: | $period can be used to check the timeperiod voilation
$width can be used to check the high time and low time voilation.
if both are used will give you sort of duty cycle voilation check. |
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alexg
Senior
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Joined: Jan 07, 2004
Posts: 586
Location: Ottawa
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| Posted: Mon Nov 24, 2008 9:47 am Post subject: |
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Here is an example of duty cycle check:
| Code: | module test;
reg clk = 0;
always #10 clk = ~clk;
time rise, fall;
integer duty;
always @(clk) begin
if (clk) rise <= $time;
else begin
fall <= $time;
duty = ($time - rise)*100/($time - fall);
if (duty < 45 | duty > 55)
$display($time, " Duty cycle error, d = %0d", duty);
end
end
initial #100 $finish;
endmodule
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-Alex |
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