ecp5: Improve global routing robustness
Signed-off-by: David Shah <dave@ds0.me>
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2aaef61547
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3c60ea383d
@ -63,6 +63,13 @@ class Ecp5GlobalRouter
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return false;
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}
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bool is_logic_port(const PortRef &user)
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{
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if (user.cell->type == id_TRELLIS_SLICE && user.port != id_CLK && user.port != id_WCK)
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return true;
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return false;
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}
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std::vector<NetInfo *> get_clocks()
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{
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std::unordered_map<IdString, int> clockCount;
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@ -162,6 +169,8 @@ class Ecp5GlobalRouter
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if (ctx->checkWireAvail(next)) {
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for (auto pip : ctx->getPipsUphill(next)) {
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WireId src = ctx->getPipSrcWire(pip);
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if (backtrace.count(src))
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continue;
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backtrace[src] = pip;
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upstream.push(src);
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}
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@ -414,6 +423,8 @@ class Ecp5GlobalRouter
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keep_users.push_back(user);
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} else if (net->driver.cell->type == id_EXTREFB && user.cell->type == id_DCUA) {
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keep_users.push_back(user);
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} else if (is_logic_port(user)) {
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keep_users.push_back(user);
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} else {
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glbnet->users.push_back(user);
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user.cell->ports.at(user.port).net = glbnet.get();
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