wafer.space Community - SDF annotation issues with Icarus

Leo Moser (mole99)

@Tholin would probably appreciate your contribution of specify timing blocks in the repository.

Currently trying out SDF annotated gate simulations as well. Would adding specify timing blocks be useful if Librelane can generate SDF annotations from STA for you?

Jason Yang

Currently trying out SDF annotated gate simulations as well. Would adding specify timing blocks be useful if Librelane can generate SDF annotations from STA for you?

I don't understand the question. LibreLane already generates SDF timing data, gf180mcu_as_sc_mcu7t3v3 just needs the specify blocks. If you would like to add them, it would probably be a good idea to gate them behind an ` ifndef FUNCTIONAL`` same as in sky130.

Leo Moser (mole99)

I don't understand the question. LibreLane already generates SDF timing data, gf180mcu_as_sc_mcu7t3v3 just needs the specify blocks. If you would like to add them, it would probably be a good idea to gate them behind an ` ifndef FUNCTIONAL`` same as in sky130.

Since Librelane can already generate SDF timing data for you, would there be a point in adding the specify blocks in the Verilog models

Jason Yang

Since Librelane can already generate SDF timing data for you, would there be a point in adding the specify blocks in the Verilog models

The specify blocks in the Verilog models act as placeholders that the simulator populates with the SDF data. Often they are just simply empty triplets (0.0,0.0,0.0).