9 commits

Author	SHA1	Message	Date
whitequark	a069d975b2	lib.cdc: use a local clock domain in ResetSynchronizer. ... This reverts commit 779f3ee906. This reverts commit 300d47ca2e. This reverts commit 9c54d0c061.	2019-08-19 21:45:08 +00:00
whitequark	779f3ee906	lib.cdc: avoid interior clock domains in ResetSynchronizer. ... Such clock domains will "leak" into the enclosing scope, which is generally undesirable. Also, this is instructive for a platform overriding the behavior, since it provides guidance on how to correctly instantiate platform-specific flops. I've considered also doing this for MultiReg(), but it is very challenging in presence of non-reset-less CDC FFs, since Yosys' $dffsr primitive has separate set and clear inputs, and reshuffling the reset value for those results in quite a bit of additional logic. (That said, it might have to be done anyway, precisely because letting Yosys generate this additional logic might prove too much for the toolchain to cope with, and again, platform-independent code should provide guidance to platform-specific code.)	2019-06-28 07:34:10 +00:00
whitequark	21379dd44b	lib.cdc: eliminate no_retiming attributes. ... See #115 for rationale.	2019-06-28 07:22:54 +00:00
Simon Kirkby	2423eabc15	lib.cdc: fix typo.	2019-06-09 10:24:01 +00:00
whitequark	44711b7d08	hdl.ir: detect elaboratables that are created but not used. ... Requres every elaboratable to inherit from Elaboratable, but still accepts ones that do not, with a warning. Fixes #3.	2019-04-21 08:52:57 +00:00
Luke Wren	23a07b955f	lib.cdc: add optional reset to MultiReg, and document its use cases.	2019-03-28 05:21:48 +00:00
whitequark	f44ca291c1	lib.cdc: add ResetSynchronizer.	2019-01-26 18:07:59 +00:00
whitequark	4948162f33	hdl.ir: rename .get_fragment() to .elaborate(). ... Closes #9.	2019-01-26 02:31:12 +00:00
whitequark	790eb05a92	Rename fhdl→hdl, genlib→lib.	2018-12-15 14:25:31 +00:00

Renamed from nmigen/genlib/cdc.py (Browse further)