I m trying to harden user project wrapper to include my modu

Question

I m trying to harden user project wrapper to include my module and 2 previously hardened macros config is here <https github com mattvenn multi project harness tree matt openlane config openlane user project wrapper>

tnt · Answer

That s because it s probably not The default `interactive tcl` and really the whole stuff in `user project wrapper` is setup only to wire things and not to synthesize any logic

Matt Venn · Answer

yeah I just found this as well <https skywater pdk slack com archives C016H8WJMBR p1606748338415000>

tnt · Answer

The way I see it you have 2 options Come up with a custom `interactive tcl` scripts that combines the normal flow from openlane s `flow tcl` add adds the custom steps needed to be a top level module for the caravel Put all your custom muxing logic into another macro which has exposed external ports to connect to upstream and to each of your subprojects independently harden that separately like you hardened the subprojects and then in the `user project wrapper` you only have wiring

Matt Venn · Answer

how about this 3rd option harden the muxing logic as well as all the blackboxed macros into one big macro

Matt Venn · Answer

then wire that into user project wrapper

Matt Venn · Answer

I don t want to do 1 because it feels like a world of pain

tnt · Answer

Sure that works too I thought you wanted to keep the subproject separate

Matt Venn · Answer

well they will still be separated pre hardened macros

Matt Venn · Answer

but I guess swimming in a sea of decap

Matt Venn · Answer

I was trying to avoid 2 because it involves a lot of hacking on verilog that I had hoped was finished

Matt Venn · Answer

but maybe it s the best option

tnt · Answer

Oh you want to keep them as macro inside huh yeah it s possible too but beware of power grid

tnt · Answer

the user project wrapper layer will not see the grid pads from your inside macro and so won t connect to them

tnt · Answer

you can probably do something similar to what I did to power the SRAMs Have the inside macro not use `met5` at all and export their `met4` straps as power pads in the LEF Have your muxing macro generate `met5` straps over the whole thing and create proper vias to the exposed `met4`straps from the subblocks Have those `met5` straps match the top level pitch of 180 expose them all as pads and have the LEF a bit and then align it properly in the wrapper to match the top level power grid

Matt Venn · Answer

dang now 2 sounds easier