[Libre-soc-dev] NGI POINTER gigabit ethernet router ASIC roadmap

Jean-Paul Chaput Jean-Paul.Chaput at lip6.fr
Mon Nov 1 12:00:38 GMT 2021

On Mon, 2021-11-01 at 11:49 +0000, lkcl wrote:
> On November 1, 2021 11:42:09 AM UTC, Jean-Paul Chaput <Jean-Paul.Chaput at lip6.fr> wrote:
> > Yes. It's floorplaning work. About the placement of SRAM (or *any*
> > sizeable
> > macro-block), they must be put on *any* side of the chip so the regular
> > clock
> >  tree spreading from the center of the design is not hampered.
> interesting.
> > I would like to start that exploratory work as soon as possible and not
> > wait for a provisional realistic HDL to be ready. So would it be
> > possible
> > to have the size & numbers of macro-blocks (both SRAM & analogs) so I
> > can
> > create abstracts, and a "fake" design that instantiate them and has a
> > similar
> >  number of gates after logical synthesis? 
> in theory we can use ls180 but instead of DFFs use SRAMs, some of them are binary-
> addressed, this will be easy.
> however some regfiles are *unary* addressed (CR file) i.e. there is no binary-decoder
> needed as part of the SRAM.
> but this should not affect what you want to do.
> an option to ls180 to build with the regfile memories as a "blackbox" cell, this should
> work perfectly fine and give something of big size to use.

  Yes. I would just need an updated netlist with the blackbox done the same
  way as a SRAM. And a rough idea about it's dimensions and external pins
    Another question: are the PHY on the chip or will they be "externally"
  connected (i.e. should I make blackboxes for them too) ?


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