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| author | David Shah <davey1576@gmail.com> | 2018-07-24 11:21:10 +0200 |
|---|---|---|
| committer | David Shah <davey1576@gmail.com> | 2018-07-24 11:21:10 +0200 |
| commit | 4359197dfe49f981966222679d8270b0d4dc311d (patch) | |
| tree | 7e2f4404a307e21f1f290aab7237ab4cb94f0b21 /ice40/pack.cc | |
| parent | a09f95bb06025afecd5753c969443928f1f0894a (diff) | |
| download | nextpnr-4359197dfe49f981966222679d8270b0d4dc311d.tar.gz nextpnr-4359197dfe49f981966222679d8270b0d4dc311d.tar.bz2 nextpnr-4359197dfe49f981966222679d8270b0d4dc311d.zip | |
ice40: Trim BRAM constant inputs, reduces routing congestion around BRAM
Signed-off-by: David Shah <davey1576@gmail.com>
Diffstat (limited to 'ice40/pack.cc')
| -rw-r--r-- | ice40/pack.cc | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/ice40/pack.cc b/ice40/pack.cc index 7e2e389c..164fa756 100644 --- a/ice40/pack.cc +++ b/ice40/pack.cc @@ -311,6 +311,9 @@ 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); |