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ice40: Trim BRAM constant inputs, reduces routing congestion around BRAM

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Signed-off-by: David Shah <davey1576@gmail.com>
This commit is contained in:
David Shah 2018-07-24 11:21:10 +02:00
parent a09f95bb06
commit 4359197dfe
1 changed files with 3 additions and 0 deletions
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ice40/pack.cc
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@ -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);