DCM virtex 2 doesn't lose lock

Sep 23, 2003 1 Replies
B

Hi,



I have a design that transmits data trough a cable and sends the clock along. At the receiver side the clock is going trough a dcm when i disconnect the cable the dcm doesn't lose his lock (somtimes it does). there is some rubbisch in the hanging cable (status bit is toggling)



what could be the problem. the rubbisch in the cable is not good enough to filter a clock out of it. Even if there is no rubbisch the lock doesn't dissapear (have measured it)



Yours Bram


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Bram,

The DCM is a synchronous state machine, and if the clock is lost, it does not have the ability to change the LOCKED signal, but the CLKIN_LOST status bit does go high.

I suggest you use the status bits more fully to determine the true state of the DCM.

Aust> Hi,

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