From d27ec2cd1554d9f8a3e6e5b81b9bb12cf7aab13b Mon Sep 17 00:00:00 2001
From: David Shah <dave@ds0.me>
Date: Mon, 1 Apr 2019 12:25:32 +0100
Subject: ice40: Don't constrain to a PLL bel that has already been used

Fixes #258

Signed-off-by: David Shah <dave@ds0.me>
---
 ice40/pack.cc | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'ice40')

diff --git a/ice40/pack.cc b/ice40/pack.cc
index 4de88abd..b1efe5b2 100644
--- a/ice40/pack.cc
+++ b/ice40/pack.cc
@@ -858,6 +858,8 @@ static void place_plls(Context *ctx)
             // Find a BEL for it
             BelId found_bel;
             for (auto bel_pll : pll_all_bels) {
+                if (pll_used_bels.count(bel_pll.first))
+                    continue;
                 BelPin pll_io_a, pll_io_b;
                 std::tie(pll_io_a, pll_io_b) = bel_pll.second;
                 if (bel2io.count(pll_io_a.bel)) {
-- 
cgit v1.2.3