From 3042f9e792985cd204e1239d727541e566ddfcef Mon Sep 17 00:00:00 2001
From: Maciej Kurc <mkurc@antmicro.com>
Date: Wed, 2 Feb 2022 09:24:28 +0100
Subject: Fixed correction of Nexus OSCA frequency constraints
Signed-off-by: Maciej Kurc <mkurc@antmicro.com>
---
nexus/pack.cc | 4 ++--
1 file 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,
--
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