diff options
Diffstat (limited to 'ice40/cells.cc')
| -rw-r--r-- | ice40/cells.cc | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/ice40/cells.cc b/ice40/cells.cc index e0640f0c..d21d5b3b 100644 --- a/ice40/cells.cc +++ b/ice40/cells.cc @@ -25,7 +25,7 @@ NEXTPNR_NAMESPACE_BEGIN void add_port(const Context *ctx, CellInfo *cell, std::string name, - PortType dir) + PortType dir) { IdString id = ctx->id(name); cell->ports[id] = PortInfo{id, nullptr, dir}; @@ -179,7 +179,7 @@ void dff_to_lc(const Context *ctx, CellInfo *dff, CellInfo *lc, replace_port(dff, "Q", lc, "O"); } -void nxio_to_sb(const Context *ctx, CellInfo *nxio, CellInfo *sbio) +void nxio_to_sb(Context *ctx, CellInfo *nxio, CellInfo *sbio) { if (nxio->type == ctx->id("$nextpnr_ibuf")) { sbio->params[ctx->id("PIN_TYPE")] = "1"; @@ -190,9 +190,28 @@ void nxio_to_sb(const Context *ctx, CellInfo *nxio, CellInfo *sbio) } else if (nxio->type == ctx->id("$nextpnr_obuf")) { sbio->params[ctx->id("PIN_TYPE")] = "25"; replace_port(nxio, "I", sbio, "D_OUT_0"); + } else if (nxio->type == ctx->id("$nextpnr_iobuf")) { + // N.B. tristate will be dealt with below + sbio->params[ctx->id("PIN_TYPE")] = "25"; + replace_port(nxio, "I", sbio, "D_OUT_0"); + replace_port(nxio, "O", sbio, "D_IN_0"); } else { assert(false); } + NetInfo *donet = sbio->ports.at(ctx->id("D_OUT_0")).net; + CellInfo *tbuf = + net_driven_by(ctx, donet, [] + (const Context *ctx, const CellInfo *cell) { + return cell->type == ctx->id("$_TBUF_"); + }, + "Y"); + if (tbuf) { + sbio->params[ctx->id("PIN_TYPE")] = "41"; + replace_port(tbuf, "A", sbio, "D_OUT_0"); + replace_port(tbuf, "E", sbio, "OUTPUT_ENABLE"); + ctx->nets.erase(donet->name); + ctx->cells.erase(tbuf->name); + } } bool is_clock_port(const Context *ctx, const PortRef &port) |