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ecp5: Allow setting drive strength for 3V3 IOs

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Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah 2019-10-26 22:21:18 +01:00
parent bac8335222
commit 5cf0ed5ede
1 changed files with 10 additions and 0 deletions
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10
ecp5/bitstream.cc
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@ -865,6 +865,16 @@ void write_bitstream(Context *ctx, std::string base_config_file, std::string tex
if (ci->attrs.count(ctx->id("DIFFRESISTOR"))) if (ci->attrs.count(ctx->id("DIFFRESISTOR")))
cc.tiles[pio_tile].add_enum(pio + ".DIFFRESISTOR", cc.tiles[pio_tile].add_enum(pio + ".DIFFRESISTOR",
str_or_default(ci->attrs, ctx->id("DIFFRESISTOR"), "OFF")); str_or_default(ci->attrs, ctx->id("DIFFRESISTOR"), "OFF"));
if (ci->attrs.count(ctx->id("DRIVE"))) {
static bool drive_3v3_warning_done = false;
if (iotype == "LVCMOS33") {
cc.tiles[pio_tile].add_enum(pio + ".DRIVE", str_or_default(ci->attrs, ctx->id("DRIVE"), "8"));
} else {
if (!drive_3v3_warning_done)
log_warning("Trellis limitation: DRIVE can only be set on 3V3 IO pins.\n");
drive_3v3_warning_done = true;
}
}
if (ci->attrs.count(ctx->id("TERMINATION"))) { if (ci->attrs.count(ctx->id("TERMINATION"))) {
auto vccio = get_vccio(ioType_from_str(iotype)); auto vccio = get_vccio(ioType_from_str(iotype));
switch (vccio) { switch (vccio) {