Document the difference between "DFFRAM Compiler" and "DFFRAM/OpenLane"

AUCOHL / DFFRAM

Standard Cell Library based Memory Compiler using FF/Latch cells

Apache License 2.0

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Document the difference between "DFFRAM Compiler" and "DFFRAM/OpenLane" #171

Open xobs opened 1 year ago

xobs commented 1 year ago

The README lists DFFRAM densities for both "DFFRAM Compiler" and "DFFRAM/OpenLane". Please elaborate on what this means, since "DFFRAM Compiler" appears to be 2-3x better than "DFFRAM/OpenLane".

My reading is that if you use the output from DFFRAM in a commercial compiler tool, you can improve it by 3x versus using OpenLane, but I'm not sure if that's what it means.

antonblanchard commented 1 year ago

My understanding:

DFFRAM Compiler uses the entire DFFRAM flow where it places all instances
DFFRAM/Openlane uses the DFFRAM verilog, but relies on OpenLane (well OpenROAD) to do placement.

It's not a comparison to commercial tools.