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| author | David Shah <davey1576@gmail.com> | 2018-09-24 17:58:55 +0100 |
|---|---|---|
| committer | David Shah <davey1576@gmail.com> | 2018-09-24 17:58:55 +0100 |
| commit | dea87e46c4f316a950425504cadda56aaeeab280 (patch) | |
| tree | 4886aad1a5ede167faf37dd472749cbc7d0263a1 | |
| parent | 2ee86ab5a80fdc2c49c6c6e34a2c0d31ae291c63 (diff) | |
| download | nextpnr-dea87e46c4f316a950425504cadda56aaeeab280.tar.gz nextpnr-dea87e46c4f316a950425504cadda56aaeeab280.tar.bz2 nextpnr-dea87e46c4f316a950425504cadda56aaeeab280.zip | |
ice40: LVDS input bitstream support
Signed-off-by: David Shah <davey1576@gmail.com>
| -rw-r--r-- | ice40/bitstream.cc | 52 |
1 files changed, 48 insertions, 4 deletions
diff --git a/ice40/bitstream.cc b/ice40/bitstream.cc index 4ea91011..124be092 100644 --- a/ice40/bitstream.cc +++ b/ice40/bitstream.cc @@ -447,6 +447,8 @@ 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";
+
for (int i = 0; i < 6; i++) {
bool val = (pin_type >> i) & 0x01;
set_config(ti, config.at(y).at(x), "IOB_" + std::to_string(z) + ".PINTYPE_" + std::to_string(i), val);
@@ -457,12 +459,20 @@ void write_asc(const Context *ctx, std::ostream &out) std::tie(iex, iey, iez) = ieren;
NPNR_ASSERT(iez != -1);
- 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;
+ 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;
+ }
}
+
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);
@@ -478,6 +488,33 @@ void write_asc(const Context *ctx, std::ostream &out) set_config(ti, config.at(iey).at(iex), "IoCtrl.cf_bit_35", !pullup);
}
}
+
+ if (lvds) {
+ 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;
+
+ 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);
+ } 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);
+ }
+
+ if (ctx->args.type == ArchArgs::UP5K) {
+ if (ciez == 0) {
+ set_config(ti, config.at(ciey).at(ciex), "IoCtrl.cf_bit_39", !pullup);
+ } else if (iez == 1) {
+ set_config(ti, config.at(ciey).at(ciex), "IoCtrl.cf_bit_35", !pullup);
+ }
+ }
+
+
+ }
} else if (cell.second->type == ctx->id("SB_GB")) {
// no cell config bits
} else if (cell.second->type == ctx->id("ICESTORM_RAM")) {
@@ -630,6 +667,13 @@ 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 (z == 1) {
+ BelId lvds0 = ctx->getBelByLocation(Loc{x, y, 0});
+ const CellInfo *lvds0cell = ctx->getBoundBelCell(lvds0);
+ if (lvds0cell != nullptr && lvds0cell->ioInfo.lvds)
+ continue;
+ }
set_ie_bit_logical(ctx, ti, config.at(iey).at(iex), "IoCtrl.IE_" + std::to_string(iez), true);
set_ie_bit_logical(ctx, ti, config.at(iey).at(iex), "IoCtrl.REN_" + std::to_string(iez), false);
}
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