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Merge pull request #1573 from YosysHQ/eddie/xilinx_tristate

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synth_xilinx: error out if tristate without '-iopad'
This commit is contained in:
N. Engelhardt 2020-01-28 17:24:54 +01:00 • committed by GitHub
commit 086c133ea5
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3 changed files with 13 additions and 1 deletions
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6
passes/techmap/tribuf.cc
View file

@ -86,6 +86,7 @@ struct TribufWorker {
cell->unsetPort(ID(S));
cell->type = tri_type;
tribuf_cells[sigmap(cell->getPort(ID::Y))].push_back(cell);
module->design->scratchpad_set_bool("tribuf.added_something", true);
continue;
}
@ -95,6 +96,7 @@ struct TribufWorker {
cell->unsetPort(ID(S));
cell->type = tri_type;
tribuf_cells[sigmap(cell->getPort(ID::Y))].push_back(cell);
module->design->scratchpad_set_bool("tribuf.added_something", true);
continue;
}
}
@ -130,8 +132,10 @@ struct TribufWorker {
if (no_tribuf)
module->connect(it.first, muxout);
else
else {
module->addTribuf(NEW_ID, muxout, module->ReduceOr(NEW_ID, pmux_s), it.first);
module->design->scratchpad_set_bool("tribuf.added_something", true);
}
}
}
}

3
techlibs/xilinx/synth_xilinx.cc
View file

@ -316,7 +316,10 @@ struct SynthXilinxPass : public ScriptPass
run("proc");
if (flatten || help_mode)
run("flatten", "(with '-flatten')");
active_design->scratchpad_unset("tribuf.added_something");
run("tribuf -logic");
if (!do_iopad && active_design->scratchpad_get_bool("tribuf.added_something"))
log_error("Tristate buffers are unsupported without the '-iopad' option.\n");
run("deminout");
run("opt_expr");
run("opt_clean");

5
tests/arch/xilinx/tribuf.sh Normal file
View file

@ -0,0 +1,5 @@
! ../../../yosys ../common/tribuf.v -qp "synth_xilinx"
../../../yosys ../common/tribuf.v -qp "synth_xilinx -iopad; \
select -assert-count 2 t:IBUF; \
select -assert-count 1 t:INV; \
select -assert-count 1 t:OBUFT"