If am running a simulation in modelsim an there is a DCM block with locked signal. Now because correct me if I am wrong but I would need t stimulate the locked signal myself because the DCM will not set it as thi is just a simulation and the DCM is a piece of hardware. Hope that make sense?
Thanks
Jon
The DCM model does generate the locked signal.
Cheers, Jon
I would be very careful of using the "locked" signal in any Spartan-3 based design as it does not always behave in the way that people assume.
John Adair Enterpoint Ltd. - Home of Broaddown2. The Ultimate Spartan-3 Development Board.
I have a DDR design from Xilinx MIG and the lock signal never moves fro '0'. So I have just created my own design with just a DCM and the loc signal still is '0'. I cant see that I am doing anything particularl wrong?
Cheers
Jon
Are you resetting the DCM (after at least 16 clocks) ? is your input clock at least 25 MHz? did you set the resolution of the simulator at 1ps?
Francesco
It turns out I did not have the feedback signal connected. So it all work fine now.
Thanks
Jon
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