From 163dee1e1ad90091cbb2742190a07aa87fa83d7f Mon Sep 17 00:00:00 2001 From: David Shah Date: Thu, 14 May 2020 13:19:57 +0100 Subject: ecp5: Disconnect dedicated DCU inputs if connected to constants Signed-off-by: David Shah --- ecp5/pack.cc | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/ecp5/pack.cc b/ecp5/pack.cc index 55b2c791..fb8a95e9 100644 --- a/ecp5/pack.cc +++ b/ecp5/pack.cc @@ -1617,6 +1617,18 @@ class Ecp5Packer for (auto pin : ctx->getBelPins(exemplar_bel)) if (ctx->getBelPinType(exemplar_bel, pin) == PORT_IN) autocreate_empty_port(ci, pin); + // Disconnect these ports if connected to constant to prevent routing failure + for (auto ndport : {id_D_TXBIT_CLKP_FROM_ND, id_D_TXBIT_CLKN_FROM_ND, id_D_SYNC_ND, + id_D_TXPLL_LOL_FROM_ND, id_CH0_HDINN, id_CH0_HDINP, id_CH1_HDINN, id_CH1_HDINP}) { + const NetInfo *net = get_net_or_empty(ci, ndport); + if (net == nullptr || net->driver.cell == nullptr) + continue; + IdString ct = net->driver.cell->type; + if (ct == ctx->id("GND") || ct == ctx->id("VCC")) { + disconnect_port(ctx, ci, ndport); + ci->ports.erase(ndport); + } + } } } for (auto cell : sorted(ctx->cells)) { -- cgit v1.2.3