From 6cb4e2e83bcf6173e646df10a4a14e32b8128ccb Mon Sep 17 00:00:00 2001 From: Sylvain Munaut Date: Thu, 11 Apr 2019 13:50:36 +0200 Subject: ice40/pack: During IO packing, remove any unused input connection This is mostly for the benefit of PLL placement because the D_IN_x ports are used for other purposes when PLL is enabled so we need to make sure nothing is connected there already. (even an unused net is too much) Signed-off-by: Sylvain Munaut --- ice40/pack.cc | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'ice40') diff --git a/ice40/pack.cc b/ice40/pack.cc index b1efe5b2..98cacad3 100644 --- a/ice40/pack.cc +++ b/ice40/pack.cc @@ -502,6 +502,19 @@ static void pack_io(Context *ctx) // Make it a normal SB_IO with global marker ci->type = ctx->id("SB_IO"); ci->attrs[ctx->id("GLOBAL")] = "1"; + } else if (is_sb_io(ctx, ci)) { + // Disconnect unused inputs + NetInfo *net_in0 = ci->ports.count(id_D_IN_0) ? ci->ports[id_D_IN_0].net : nullptr; + NetInfo *net_in1 = ci->ports.count(id_D_IN_1) ? ci->ports[id_D_IN_1].net : nullptr; + + if (net_in0 != nullptr && net_in0->users.size() == 0) { + delete_nets.insert(net_in0->name); + ci->ports[id_D_IN_0].net = nullptr; + } + if (net_in1 != nullptr && net_in1->users.size() == 0) { + delete_nets.insert(net_in1->name); + ci->ports[id_D_IN_1].net = nullptr; + } } } for (auto pcell : packed_cells) { -- cgit v1.2.3