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ice40: Set config bits for unused IO

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Signed-off-by: David Shah <davey1576@gmail.com>
This commit is contained in:
David Shah 2018-06-10 13:38:34 +02:00
parent 4e6d6e632f
commit 8d5da98122
1 changed files with 19 additions and 1 deletions
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20
ice40/bitstream.cc
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@ -188,9 +188,27 @@ void write_asc(const Design &design, std::ostream &out)
assert(false);
}
}
// Set config bits in unused IO
for (auto bel : chip.getBels()) {
if (chip.bel_to_cell[bel.index] == IdString() && chip.getBelType(bel) == TYPE_SB_IO) {
TileInfoPOD &ti = bi.tiles_nonrouting[TILE_IO];
const BelInfoPOD &beli = ci.bel_data[bel.index];
int x = beli.x, y = beli.y, z = beli.z;
auto ieren = get_ieren(bi, x, y, z);
int iex, iey, iez;
std::tie(iex, iey, iez) = ieren;
if (iez != -1) {
set_config(ti, config.at(iey).at(iex),
"IoCtrl.IE_" + std::to_string(iez), true);
set_config(ti, config.at(iey).at(iex),
"IoCtrl.REN_" + std::to_string(iez), false);
}
}
}
// Set other config bits - currently just disable RAM to stop icebox_vlog
// crashing
// TODO: ColBufCtrl , unused IO
// TODO: ColBufCtrl
for (int y = 0; y < ci.height; y++) {
for (int x = 0; x < ci.width; x++) {
TileType tile = tile_at(chip, x, y);