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| author | gatecat <gatecat@ds0.me> | 2022-02-02 08:49:31 +0000 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2022-02-02 08:49:31 +0000 |
| commit | 6fceac95c02b16a208dd17123dba46bc3618c1fb (patch) | |
| tree | 052b1875ea7b9ebcaf09bb37b94c3d4464a9db3a /nexus | |
| parent | c306ef12bcb5c5fed8782cbfa05d6534ce6a49dd (diff) | |
| parent | 3042f9e792985cd204e1239d727541e566ddfcef (diff) | |
| download | nextpnr-6fceac95c02b16a208dd17123dba46bc3618c1fb.tar.gz nextpnr-6fceac95c02b16a208dd17123dba46bc3618c1fb.tar.bz2 nextpnr-6fceac95c02b16a208dd17123dba46bc3618c1fb.zip | |
Merge pull request #902 from antmicro/nexus-osc-tolerance-2
Honor nexus OSCA frequency tolerance (corrected)
Diffstat (limited to 'nexus')
| -rw-r--r-- | nexus/pack.cc | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/nexus/pack.cc b/nexus/pack.cc index 41f9d806..5e9da304 100644 --- a/nexus/pack.cc +++ b/nexus/pack.cc @@ -1988,8 +1988,8 @@ struct NexusPacker } else if (ci->type == id_OSC_CORE) { int div = int_or_default(ci->params, ctx->id("HF_CLK_DIV"), 128); const float tol = 1.15f; // OSCA has +/-15% frequency tolerance, assume the worst case. - set_period(ci, id_HFCLKOUT, delay_t(tol * (1.0e6 / 450) * (div + 1))); - set_period(ci, id_LFCLKOUT, delay_t(tol * (1.0e3 / 10))); + set_period(ci, id_HFCLKOUT, delay_t((1.0e6 / 450) * (div + 1) / tol)); + set_period(ci, id_LFCLKOUT, delay_t((1.0e3 / 10) / tol)); } else if (ci->type == id_PLL_CORE) { static const std::array<IdString, 6> div{id_DIVA, id_DIVB, id_DIVC, id_DIVD, id_DIVE, id_DIVF}; static const std::array<IdString, 6> output{id_CLKOP, id_CLKOS, id_CLKOS2, |