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nexus: DCCs cannot be cascaded

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This commit solves implicit cascading when clock signal drives DCC and logic

Signed-off-by: Maciej Dudek <mdudek@antmicro.com>
This commit is contained in:
Maciej Dudek 2022-03-09 14:13:29 +01:00
parent 81e970867d
commit 191be632e2
1 changed files with 1 additions and 1 deletions
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nexus/pack.cc
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@ -883,7 +883,7 @@ struct NexusPacker
for (size_t i = 0; i < std::min<size_t>(clk_fanout.size(), available_globals); i++) {
NetInfo *net = ctx->nets.at(clk_fanout.at(i).second).get();
log_info(" promoting clock net '%s'\n", ctx->nameOf(net));
insert_buffer(net, id_DCC, "glb_clk", id_CLKI, id_CLKO, [](const PortRef &port) { return true; });
insert_buffer(net, id_DCC, "glb_clk", id_CLKI, id_CLKO, [&](const PortRef &port) { return port.cell->type != id_DCC; });
}
}