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Question about Virtex-4 DCM

I have an application where I need to model a circuit that has two power rails.

A Vitrex-4 has only one internal power rail, so I was thinking about disabling the DCM to simulate a power-down.

This would be done by taking the signal that is normally used to enable power to the rest of the chip, and using it to remove the reset from the DCM.

I'm not concerned with DCM weirdness during start-up; I have to deal with similar issues when powering up a section of the chip at a time.

Any comments? Has anyone actually tried this?

Thanks, Gary.

Reply to
ghelbig
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Gary,

There is the BUFGMUX, which will allow you to switch from a clock, to another.

Set it for asynchronous operation (allows a switch to a dead clock), ,and then just switch over to a BUFG which has no clock on it (connected to a '0' or a '1').

I believe that RESET will also work, but as you say, there will be transitions that may occur, and if you just want everything to cease, the BUFGMUX may be a better test.

Austin (at RADECS 2007, in Deauville, Fr)

Austin

Reply to
austin

Thanks.

Reply to
ghelbig

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