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ecppll random (uninitialised?) values in output #242

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BrettRD opened this issue Nov 8, 2024 · 0 comments
Open

ecppll random (uninitialised?) values in output #242

BrettRD opened this issue Nov 8, 2024 · 0 comments

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@BrettRD
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BrettRD commented Nov 8, 2024

Running ecppll twice with the same input returns different results

$ ecppll -i 60 -o 120 --highres -f first.v
$ ecppll -i 60 -o 120 --highres -f second.v
$ diff first.v second.v 
32,33c32,33
<         .CLKOS_CPHASE(-895312416),
<         .CLKOS_FPHASE(32676),
---
>         .CLKOS_CPHASE(-1799184928),
>         .CLKOS_FPHASE(32738),

Specifying three output frequencies has the same random behaviour

Dropping the --high-res flag makes the output stable

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