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Using variables within range repetition expression in e

myonlyscreen

 Hi.

I am facing some problems with using var in  range repetition expression.

I have the next code :

a : unit;

b : uint;

keep b == a + 1234;

event e1;

event e2;

expect {@e1;[a]*@clk} => @e2 ; //  <== this works !

 expect {@e1;[a..b]*@clk} => @e2 ; //  <== this doesn't work !

I am geting the next error : 

 *** Error: first match variable repeat can only be used inside a sequence

Why ? does cadence supports such usage of the range repetition expresion ?

How do you recomend to workaround this problem ? (well beside the obivuos solution to replace it with TCM).

Regards,

E.M.

 

  • Hi,

    if you have a first match variable repeat ([a..b]*TE) it needs to be followed by something else (some successor event), e.g:
    expect {@e1; [a..b]*@clk; <some-other-temporal-exp>} => @e2;

    Btw. [a..b]*@clk succeeds (first match) at [a]*@clk, so the first expect and the second expect you wrote are the same.
    Maybe you wanted to express something else? There is also a true match repeat (~[..]*TE).

    Regards,
    -hannes 

  •  Hi,

    Thanks, for clarifying this issue.

    It does make a lot of sense to add another TE after the range repetition, in-order to avoid getting match on [a]*clk .

    Thanks again,

    E.M.   

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