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Altera_Forum
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14 years ago

State A => State B multicycle path?

Is there a way to tell TimeQuest that all signals launched by State A and captured by State B are part of a multi-cycle path? My combinational path delay is too large so i'm adding a timer to delay m...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

In my case, the target register is *using* the signal after two cycles. Therefore, the signal is being clocked on every tick but I only care about the signal state every other state (when my timer expires). In essence, it is not a clock enable but rather a delayed FSM transition.

I suppose the SDC 'set_multicycle_path' must be specified on each and every signal part of the multicycle path like above. I essentially wondered whether it would be possible to state something like:

set_multicycle_path -setup -end -from [Launch_FF] -to [Latch_FF] 2

Theorethically, then, the timing analyzer would know which signals are launched by Launch_FF and clocked in by Latch_FF and therefore know that all signals launched by Launch_FF would have 2T to reach the Latch_FF. But perhaps, it simply is not possible and I will have to specify each signal separately? I'm currently doing this (spec'd separately) and it is working fine.

Thanks.