diff options
Diffstat (limited to 'ecp5/bitstream.cc')
| -rw-r--r-- | ecp5/bitstream.cc | 47 |
1 files changed, 35 insertions, 12 deletions
diff --git a/ecp5/bitstream.cc b/ecp5/bitstream.cc index 66bd639a..207ba048 100644 --- a/ecp5/bitstream.cc +++ b/ecp5/bitstream.cc @@ -256,6 +256,18 @@ static std::string get_pic_tile(Context *ctx, BelId bel) } } +// Get the complement PIC and PIO tiles for a pseudo differential IO +static std::string get_comp_pio_tile(Context *ctx, BelId bel) +{ + NPNR_ASSERT(bel.location.y == 0); + return ctx->getTileByTypeAndLocation(0, bel.location.x + 1, "PIOT1"); +} +static std::string get_comp_pic_tile(Context *ctx, BelId bel) +{ + NPNR_ASSERT(bel.location.y == 0); + return ctx->getTileByTypeAndLocation(1, bel.location.x + 1, "PICT1"); +} + // Get the list of tiles corresponding to a blockram std::vector<std::string> get_bram_tiles(Context *ctx, BelId bel) { @@ -829,18 +841,29 @@ void write_bitstream(Context *ctx, std::string base_config_file, std::string tex cc.tiles[pio_tile].add_enum(pio + ".BASE_TYPE", dir + "_" + iotype); cc.tiles[pic_tile].add_enum(pio + ".BASE_TYPE", dir + "_" + iotype); if (is_differential(ioType_from_str(iotype))) { - // Explicitly disable other pair - std::string other; - if (pio == "PIOA") - other = "PIOB"; - else if (pio == "PIOC") - other = "PIOD"; - else - log_error("cannot place differential IO at location %s\n", pio.c_str()); - // cc.tiles[pio_tile].add_enum(other + ".BASE_TYPE", "_NONE_"); - // cc.tiles[pic_tile].add_enum(other + ".BASE_TYPE", "_NONE_"); - cc.tiles[pio_tile].add_enum(other + ".PULLMODE", "NONE"); - cc.tiles[pio_tile].add_enum(pio + ".PULLMODE", "NONE"); + if (bel.location.y == 0) { + // Pseudo differential top IO + NPNR_ASSERT(dir == "OUTPUT"); + NPNR_ASSERT(pio == "PIOA"); + std::string cpio_tile = get_comp_pio_tile(ctx, bel); + std::string cpic_tile = get_comp_pic_tile(ctx, bel); + cc.tiles[cpio_tile].add_enum(pio + ".BASE_TYPE", dir + "_" + iotype); + cc.tiles[cpic_tile].add_enum(pio + ".BASE_TYPE", dir + "_" + iotype); + } else { + // Explicitly disable other pair + std::string other; + if (pio == "PIOA") + other = "PIOB"; + else if (pio == "PIOC") + other = "PIOD"; + else + log_error("cannot place differential IO at location %s\n", pio.c_str()); + // cc.tiles[pio_tile].add_enum(other + ".BASE_TYPE", "_NONE_"); + // cc.tiles[pic_tile].add_enum(other + ".BASE_TYPE", "_NONE_"); + cc.tiles[pio_tile].add_enum(other + ".PULLMODE", "NONE"); + cc.tiles[pio_tile].add_enum(pio + ".PULLMODE", "NONE"); + } + } else if (is_referenced(ioType_from_str(iotype))) { cc.tiles[pio_tile].add_enum(pio + ".PULLMODE", "NONE"); } |