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SVA "seq_a |-> seq_b |-> seq_c"

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davyzhu

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seq_c

Hi,all ,

There is "seq_a |-> seq_b |-> seq_c" in SVA.

Is " seq_a |-> seq_b |-> seq_c " equal to
" (seq_a and seq_b) |-> seq_c "?

Or shall we need only care the last implication (|-> or |=>), thanks!

Best regards,
Davy
 

davyzhu said:
Hi,all ,

There is "seq_a |-> seq_b |-> seq_c" in SVA.

Is " seq_a |-> seq_b |-> seq_c " equal to
" (seq_a and seq_b) |-> seq_c "?

Or shall we need only care the last implication (|-> or |=>), thanks!

Best regards,
Davy
Click to expand...
Davy,
They are quite different. The "and" you refer to is "temporal anding" not "boolean and" (even if it is, it won't match nested implications). A temporal "and" gets satisfied if:

Both seq_q, seq_b start at the same time
The end time of this "composite sequence" is end time of last ending sequence. i.e. say:

seq_b and seq_a starts at clk_10

seq_a ends at clk_20
seq_b ends at clk_30

Then the composite sequence shall end at clk_30

A nested implication is just that - like a nested if in procedural code.

HTH
Ajeetha, CVC
www.noveldv.com
 

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    davyzhu

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Hi Ajeetha,

Thanks a lot!
Shall I visualize "seq_a |-> seq_b |-> seq_c " as
[1] "seq_a |-> (seq_b |-> seq_c)"
or
[2] "(seq_a |-> seq_b) |-> seq_c"

Is [1] and [2] different?

Best regards,
Davy
 

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