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-rw-r--r--ecp5/bitstream.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/ecp5/bitstream.cc b/ecp5/bitstream.cc
index 80543078..7db0e020 100644
--- a/ecp5/bitstream.cc
+++ b/ecp5/bitstream.cc
@@ -1171,7 +1171,7 @@ void write_bitstream(Context *ctx, std::string base_config_file, std::string tex
tg.config.add_enum(dsp + ".RESETMODE", str_or_default(ci->params, ctx->id("RESETMODE"), "SYNC"));
tg.config.add_enum(dsp + ".MODE", "MULT18X18D");
- if (str_or_default(ci->params, ctx->id("REG_OUTPUT_CLK"), "NONE") == "NONE")
+ if (str_or_default(ci->params, ctx->id("REG_OUTPUT_CLK"), "NONE") == "NONE" && ci->constr_parent == nullptr)
tg.config.add_enum(dsp + ".CIBOUT_BYP", "ON");
if (loc.z < 4)