yosys

Author	SHA1	Message	Date
Marcelina Kościelnicka	ec2b5548fe	Add $aldff and $aldffe: flip-flops with async load.	2021-10-02 18:12:52 +02:00
Marcelina Kościelnicka	817ae04ee0	simcells: Fix reset polarity for $_DLATCH_???_ cells.	2020-06-30 15:32:06 +02:00
Marcelina Kościelnicka	b0bee396a8	Add new builtin FF types The new types include: - FFs with async reset and enable (`$adffe`, `$_DFFE_[NP][NP][01][NP]_`) - FFs with sync reset (`$sdff`, `$_SDFF_[NP][NP][01]_`) - FFs with sync reset and enable, reset priority (`$sdffs`, `$_SDFFE_[NP][NP][01][NP]_`) - FFs with sync reset and enable, enable priority (`$sdffce`, `$_SDFFCE_[NP][NP][01][NP]_`) - FFs with async reset, set, and enable (`$dffsre`, `$_DFFSRE_[NP][NP][NP][NP]_`) - latches with reset or set (`$adlatch`, `$_DLATCH_[NP][NP][01]_`) The new FF types are not actually used anywhere yet (this is left for future commits).	2020-06-23 15:40:02 +02:00
Marcelina Kościelnicka	53ba3cf718	Fix the truth table for $_SR_* cells. This brings the documented behavior for these cells in line with $_DFFSR_* and $_DLATCHSR_*, which is that R has priority over S. The models were already reflecting that behavior. Also get rid of sim-synth mismatch in the models while we're at it.	2020-04-15 17:17:48 +02:00
Marcin Kościelnicki	0ed1062557	simcells.v: Generate the fine FF cell types by a python script. This makes adding more FF types in the future much more manageable. Fixes #1824.	2020-04-02 18:37:15 +02:00