vyges-est

Parasitic estimation before detailed routing: the RC network of every net, built from its placement or from its global route, in the form a static timer reads.

• Placement (vyges-est estimate): a Steiner tree per net from its pin locations, a pi model per branch with each corner's wire RC, via chains from the pins' layers, written as SPEF. Matches OpenROAD's estimate_parasitics -placement SPEF byte for byte on 8 of 9 of its own tests and 180 of 186 of the other regression cases that call it (21,289 nets), at the pin --describe reports.
• Global route (the wire module): one node per routing point, a resistor per route segment with its capacitance split to both ends, and a resistor from each pin to the grid point it attaches to. A library for the router; not a command.

vyges install loom
vyges loom est estimate job.json
vyges loom est --describe

Documentation: docs/src/est.md (an mdBook; mdbook build docs), with the CLI reference.

Build

The command-line engine reads the design database through vyges-opendb, which builds OpenROAD's database library from source. Check out vyges-tools/opendb, opendb-lib and loom beside this repository (see .github/workflows/ci.yml), then:

cargo build --release --features cli
cargo test  --release --features cli

Without --features cli the library builds with no C++ dependency, and the pure rules (liberty clocks, the global-route network) are tested on their own.

Licensed under Apache-2.0.