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-rw-r--r--ecp5/bitstream.cc6
1 files changed, 4 insertions, 2 deletions
diff --git a/ecp5/bitstream.cc b/ecp5/bitstream.cc
index 9fb823ab..c6863cd6 100644
--- a/ecp5/bitstream.cc
+++ b/ecp5/bitstream.cc
@@ -867,8 +867,10 @@ void write_bitstream(Context *ctx, std::string base_config_file, std::string tex
if (is_differential(ioType_from_str(iotype))) {
if (bel.location.y == 0) {
// Pseudo differential top IO
- NPNR_ASSERT(dir == "OUTPUT");
- NPNR_ASSERT(pio == "PIOA");
+ if (dir != "OUTPUT")
+ log_error("Pseudo-differential IO '%s' must be output\n", ctx->nameOf(ci));
+ if (pio != "PIOA")
+ log_error("Pseudo-differential IO '%s' must be constrained to 'A' side of pair\n", ctx->nameOf(ci));
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);