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hdl.ir: when adding sync domain to a design, also add it to ports.

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Otherwise we end up in a situation where the examples don't have
clk and rst as ports, which is not nice.

Fixes #67.
This commit is contained in:
whitequark 2019-05-15 06:44:50 +00:00
parent 39bc59c924
commit c337246fc5
2 changed files with 19 additions and 5 deletions
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16
nmigen/hdl/ir.py
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@ -327,8 +327,13 @@ class Fragment:
def _propagate_domains(self, ensure_sync_exists):
self._propagate_domains_up()
if ensure_sync_exists and not self.domains:
self.add_domains(ClockDomain("sync"))
cd_sync = ClockDomain()
self.add_domains(cd_sync)
new_domains = (cd_sync,)
else:
new_domains = ()
self._propagate_domains_down()
return new_domains
def _insert_domain_resets(self):
from .xfrm import ResetInserter
@ -479,14 +484,19 @@ class Fragment:
from .xfrm import SampleLowerer
fragment = SampleLowerer()(self)
fragment._propagate_domains(ensure_sync_exists)
new_domains = fragment._propagate_domains(ensure_sync_exists)
fragment._resolve_hierarchy_conflicts()
fragment = fragment._insert_domain_resets()
fragment = fragment._lower_domain_signals()
if ports is None:
fragment._propagate_ports(ports=(), all_undef_as_ports=True)
else:
fragment._propagate_ports(ports=ports, all_undef_as_ports=False)
new_ports = []
for cd in new_domains:
new_ports.append(cd.clk)
if cd.rst is not None:
new_ports.append(cd.rst)
fragment._propagate_ports(ports=(*ports, *new_ports), all_undef_as_ports=False)
return fragment