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Old 04-11-2006, 12:52 PM
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Default simulation of DCM blocks

Hi all,
I am designing a hadware which use clk and 2xclk. I am planning to
use DCm block in the V4 to get the 2x clock. But the board is not yet
available. So i thought to proceed with the post PAR test. Synthesized
the a DCM block in which clk0 is fedback to clkfb through a bufg.
generated post par simulation model using ISE 7.1. And simulated it on
model sim with libraries X_DCM_ADV.v etc attached. But the clk0 and
clk2x gives a flat '1' output not clock. Why is this behaviour. Is it
possible to simulate the DCM behaviour ??
Sumesh V S

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Old 04-11-2006, 01:39 PM
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Default Re: simulation of DCM blocks

I got it correctly problem was applied active low reset. Locked after
some 30 clk cycles. The lock pin is high but the edges of the clkin and
clk1x and clk2x are at different time. Why it is like that. Is this the
problem with the simulation.

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