f4891a0aee
* New: In Cumulus/plugins.block.matrix.RegisterMatrix, based on pattern
matching the output of DFF, allow to rebuild and place a matrix of
DFF constituting a RAM.
It finally proven not useful because it is a too naive approach.
Intermediate gates (buf_x2) must be found too. Most of the control
signals have more than 20 sinks so gets splitted by HFNS and lastly,
we would want the decoder to be integrated too, but they are not
regulars.
The right way to do it is to create a generator that build it
then expose it in a way nMigen can understand (not the other way
around, nMigen -> Yosys).
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