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-rw-r--r--ice40/pack.cc4
1 files changed, 4 insertions, 0 deletions
diff --git a/ice40/pack.cc b/ice40/pack.cc
index 03b33190..b1e7380e 100644
--- a/ice40/pack.cc
+++ b/ice40/pack.cc
@@ -312,6 +312,10 @@ static void set_net_constant(const Context *ctx, NetInfo *orig, NetInfo *constne
(user.port != ctx->id("CLK") &&
((constval && user.port == ctx->id("CE")) || (!constval && user.port != ctx->id("CE"))))) {
uc->ports[user.port].net = nullptr;
+ } else if (is_ram(ctx, uc) && !constval && user.port != ctx->id("RCLK") && user.port != ctx->id("RCLKN") &&
+ user.port != ctx->id("WCLK") && user.port != ctx->id("WCLKN") && user.port != ctx->id("RCLKE") &&
+ user.port != ctx->id("WCLKE")) {
+ uc->ports[user.port].net = nullptr;
} else {
uc->ports[user.port].net = constnet;
constnet->users.push_back(user);