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Merge pull request #155 from smunaut/issue_151

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ice40: Update the way LVDS inputs are handled during bitstream generation
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David Shah 2018-11-28 16:20:36 +00:00 committed by GitHub
commit 0872b63b0b
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1 changed files with 48 additions and 48 deletions
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64
ice40/bitstream.cc
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@ -486,7 +486,7 @@ void write_asc(const Context *ctx, std::ostream &out)
unsigned pin_type = get_param_or_def(cell.second.get(), ctx->id("PIN_TYPE"));
bool neg_trigger = get_param_or_def(cell.second.get(), ctx->id("NEG_TRIGGER"));
bool pullup = get_param_or_def(cell.second.get(), ctx->id("PULLUP"));
bool lvds = get_param_str_or_def(cell.second.get(), ctx->id("IO_STANDARD")) == "SB_LVDS_INPUT";
bool lvds = cell.second->ioInfo.lvds;
bool used_by_pll_out = sb_io_used_by_pll_out.count(Loc(x, y, z)) > 0;
bool used_by_pll_pad = sb_io_used_by_pll_pad.count(Loc(x, y, z)) > 0;
@ -495,27 +495,21 @@ void write_asc(const Context *ctx, std::ostream &out)
set_config(ti, config.at(y).at(x), "IOB_" + std::to_string(z) + ".PINTYPE_" + std::to_string(i), val);
}
set_config(ti, config.at(y).at(x), "NegClk", neg_trigger);
bool input_en = false;
if ((ctx->wire_to_net[ctx->getBelPinWire(bel, id_D_IN_0).index] != nullptr) ||
(ctx->wire_to_net[ctx->getBelPinWire(bel, id_D_IN_1).index] != nullptr)) {
input_en = true;
}
input_en = (input_en & !used_by_pll_out) | used_by_pll_pad;
input_en |= cell.second->ioInfo.global;
if (!lvds) {
auto ieren = get_ieren(bi, x, y, z);
int iex, iey, iez;
std::tie(iex, iey, iez) = ieren;
NPNR_ASSERT(iez != -1);
bool input_en;
if (lvds) {
input_en = false;
pullup = false;
} else {
if ((ctx->wire_to_net[ctx->getBelPinWire(bel, id_D_IN_0).index] != nullptr) ||
(ctx->wire_to_net[ctx->getBelPinWire(bel, id_D_IN_1).index] != nullptr)) {
input_en = true;
} else {
input_en = false;
}
}
input_en = (input_en & !used_by_pll_out) | used_by_pll_pad;
input_en |= cell.second->ioInfo.global;
if (ctx->args.type == ArchArgs::LP1K || ctx->args.type == ArchArgs::HX1K) {
set_config(ti, config.at(iey).at(iex), "IoCtrl.IE_" + std::to_string(iez), !input_en);
set_config(ti, config.at(iey).at(iex), "IoCtrl.REN_" + std::to_string(iez), !pullup);
@ -531,28 +525,34 @@ void write_asc(const Context *ctx, std::ostream &out)
set_config(ti, config.at(iey).at(iex), "IoCtrl.cf_bit_35", !pullup);
}
}
if (lvds) {
} else {
NPNR_ASSERT(z == 0);
set_config(ti, config.at(y).at(x), "IoCtrl.LVDS", true);
// Set comp IO config
auto comp_ieren = get_ieren(bi, x, y, 1);
int ciex, ciey, ciez;
std::tie(ciex, ciey, ciez) = comp_ieren;
// Only enable the actual LVDS buffer if input is used for something
set_config(ti, config.at(y).at(x), "IoCtrl.LVDS", input_en);
// Set both IO config
for (int cz = 0; cz < 2; cz++) {
auto ieren = get_ieren(bi, x, y, cz);
int iex, iey, iez;
std::tie(iex, iey, iez) = ieren;
NPNR_ASSERT(iez != -1);
pullup &= !input_en; /* If input is used, force disable pullups */
if (ctx->args.type == ArchArgs::LP1K || ctx->args.type == ArchArgs::HX1K) {
set_config(ti, config.at(ciey).at(ciex), "IoCtrl.IE_" + std::to_string(ciez), !input_en);
set_config(ti, config.at(ciey).at(ciex), "IoCtrl.REN_" + std::to_string(ciez), !pullup);
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), !pullup);
} else {
set_config(ti, config.at(ciey).at(ciex), "IoCtrl.IE_" + std::to_string(ciez), input_en);
set_config(ti, config.at(ciey).at(ciex), "IoCtrl.REN_" + std::to_string(ciez), !pullup);
set_config(ti, config.at(iey).at(iex), "IoCtrl.IE_" + std::to_string(iez), false);
set_config(ti, config.at(iey).at(iex), "IoCtrl.REN_" + std::to_string(iez), !pullup);
}
if (ctx->args.type == ArchArgs::UP5K) {
if (ciez == 0) {
set_config(ti, config.at(ciey).at(ciex), "IoCtrl.cf_bit_39", !pullup);
if (iez == 0) {
set_config(ti, config.at(iey).at(iex), "IoCtrl.cf_bit_39", !pullup);
} else if (iez == 1) {
set_config(ti, config.at(ciey).at(ciex), "IoCtrl.cf_bit_35", !pullup);
set_config(ti, config.at(iey).at(iex), "IoCtrl.cf_bit_35", !pullup);
}
}
}
}
@ -688,7 +688,7 @@ void write_asc(const Context *ctx, std::ostream &out)
int iex, iey, iez;
std::tie(iex, iey, iez) = ieren;
if (iez != -1) {
// IO is not actually unused if part of an LVDS pair
// If IO is in LVDS pair, it will be configured by the other pair
if (z == 1) {
BelId lvds0 = ctx->getBelByLocation(Loc{x, y, 0});
const CellInfo *lvds0cell = ctx->getBoundBelCell(lvds0);