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can LEC provide cdc check?

zhiweiwu0318

Who can kindly tell me which rule is cdc(cross domain check) in LEC? i can't find any clue in the document.

by the way, i used IFV for cdc, but it can't provide all un-synchronizer singals, oops!

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  • timmynolan

    I'm not sure if i can be much help here!

    First of all. The 'reference' (not user) guide has a description of the commands and the ADD CLOCK ASSOCIATION command is described there. From what I can tell. The Syntax is:

    ADD CLOCK ASSOCIATION <known domain> <other domains> [ -name <new domain name>]

    So, the first field is the domain to group others into, followed by all other domains to make synchronous to it. Without the -Name option, the domain keeps the name of the first domain you specify (<known domain>) . I believe you can specify clock names as well as domain names. 

    I'm not entirely sure about the command you have put up. I have not used many Hierarchichal modules in Lec (most are flattened). So does Lec put the output of the Mux into a new clock domain? And you want to group the two together? You can view the associations with REPORT CLOCK ASSOCIATION and then group accordingly. Im not sure if I correctly understand the problem.

     Hope thats some help.

    Tim 

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  • timmynolan

    I'm not sure if i can be much help here!

    First of all. The 'reference' (not user) guide has a description of the commands and the ADD CLOCK ASSOCIATION command is described there. From what I can tell. The Syntax is:

    ADD CLOCK ASSOCIATION <known domain> <other domains> [ -name <new domain name>]

    So, the first field is the domain to group others into, followed by all other domains to make synchronous to it. Without the -Name option, the domain keeps the name of the first domain you specify (<known domain>) . I believe you can specify clock names as well as domain names. 

    I'm not entirely sure about the command you have put up. I have not used many Hierarchichal modules in Lec (most are flattened). So does Lec put the output of the Mux into a new clock domain? And you want to group the two together? You can view the associations with REPORT CLOCK ASSOCIATION and then group accordingly. Im not sure if I correctly understand the problem.

     Hope thats some help.

    Tim 

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