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13 Commits

Author SHA1 Message Date
Marcelina Kościelnicka 4e70c30775 FfData: some refactoring. 
- FfData now keeps track of the module and underlying cell, if any (so
  calling emit on FfData created from a cell will replace the existing cell)
- FfData implementation is split off to its own .cc file for faster
  compilation
- the "flip FF data sense by inserting inverters in front and after"
  functionality that zinit uses is moved onto FfData class and beefed up
  to have dffsr support, to support more use cases
 2021-10-07 04:24:06 +02:00
Marcelina Kościelnicka 8501342fc5 synth_xilinx: Use opt_dff. 
The main part is converting xilinx_dsp to recognize the new FF types
created in opt_dff instead of trying to recognize the patterns on its
own.

The fsm call has been moved upwards because the passes cannot deal with
$dffe/$sdff*, and other optimizations don't help it much anyway.
 2020-07-30 22:26:09 +02:00
Marcin Kościelnicki d48950d92d xilinx: Initial support for LUT4 devices. 
Adds support for mapping logic, including LUTs, wide LUTs, and carry
chains.

Fixes #1547
 2020-02-07 09:03:22 +01:00
Miodrag Milanovic ccfe1e5909 this one is fine 2020-01-10 15:20:50 +01:00
Miodrag Milanovic af852a0ea8 Fix tests 2020-01-10 14:48:01 +01:00
Miodrag Milanovic a82c701668 Make test without iopads 2019-12-28 16:22:24 +01:00
Miodrag Milanovic 509da7ed1a Revert "Fix xilinx tests, when iopads are default" 
This reverts commit 477e43d921.
 2019-12-28 16:12:45 +01:00
Miodrag Milanovic 477e43d921 Fix xilinx tests, when iopads are default 2019-12-21 13:18:44 +01:00
Marcin Kościelnicki a235250403 xilinx: Add xilinx_dffopt pass (#1557) 2019-12-18 13:43:43 +01:00
Marcin Kościelnicki aff6ad1ce0 xilinx: Improve flip-flop handling. 
This adds support for infering more kinds of flip-flops:

- FFs with async set/reset and clock enable
- FFs with sync set/reset
- FFs with sync set/reset and clock enable

Some passes have been moved (and some added) in order for dff2dffs to
work correctly.

This gives us complete coverage of Virtex 6+ and Spartan 6 flip-flop
capabilities (though not latch capabilities).  Older FPGAs also support
having both a set and a reset input, which will be handled at a later
data.
 2019-12-18 13:43:43 +01:00
Miodrag Milanovic 3e0ffe05a7 Fixed tests 2019-11-11 15:41:33 +01:00
Miodrag Milanovic 5603595e5c Share common tests 2019-10-18 12:19:59 +02:00
Miodrag Milanovic c2ec7ca703 Moved all tests in arch sub directory 2019-10-18 11:06:12 +02:00