19:51 <mkk_> Does anybody know how to make OpenLANE and YOSYS to use the skywater sram cell?

19:51 <mkk_> [Arman Avetisyan, skywater-pdk] Hello everybody,

19:51 <mkk_> Thanks.

19:56 <mkk_> [Arman Avetisyan, skywater-pdk] sram macros*

20:42 <mkk_> [Olof Kindgren, skywater-pdk] @Arman Avetisyan Is there a skywater sram cell? I was under impression that we should use openRAM for that

21:01 <mkk_> [Arman Avetisyan, skywater-pdk] @Olof Kindgren There is ready to use SKY130_SRAM_MACROS (https://github.com/efabless/sky130_sram_macros/) on efabless github. And it's disabled in openlane by default. Keep in mind it's registered inputs, registered outputs design

21:03 <mkk_> [Arman Avetisyan, skywater-pdk] Problem is I can't figure out why it is not used in my design. If I enable it.

21:03 <mkk_> And I asume Yosys does not even know about existence of this cell so he wont use it.

21:03 <mkk_> Currently I think the problem is that the openlane makefile contains error. It can disable but with current makefile it is impossible to enable it without makefile modification.

21:15 <mkk_> [Olof Kindgren, skywater-pdk] @Arman Avetisyan I see. I don't use the flow in the same way so I can't answer that unfortunately

23:05 <mkk_> [Arman Avetisyan, skywater-pdk] OpenRAM can't be used in SKY130 as far as I am aware without signing NDA because the ready to use scripts and configurations files are not available open-source

23:06 <mkk_> [Arman Avetisyan, skywater-pdk] Can somebody correct me?

23:49 <lkcl> Arman: for the Libre-SOC 180nm we are doing custom 4k SRAM cells (thanks to Chips4Makers) which are simply marked with a "blackbox" attribute

23:49 <lkcl> coriolis2 then noted the "blackbox" attribute and told yosys not to do anything with it

23:50 <lkcl> daveshah wrote a script that *does* auto-detection of SRAM cells and will "munge" the netlist to use such "black boxes" (aka "an SRAM cell")

23:51 <lkcl> context: https://bugs.libre-soc.org/show_bug.cgi?id=502#c15

23:52 <lkcl> ah no, not daveshah after all

23:52 <lkcl> still the same thing though

23:52 <lkcl> https://stackoverflow.com/questions/60143268/how-to-create-a-custom-technology-cell-map-for-yosys

23:54 <lkcl> yosys is run by scripting. you are *not* restricted to that which is provided *by default* with yosys.