Vyges Loom — the open EDA sign-off & optimization suite
The Loom suite, under
vyges. Install once —vyges install loom— then run any engine asvyges loom <engine>(e.g.vyges loom sta-si run top.sta). Each engine is also a standalonevyges-<engine>binary on your PATH, which is what the dispatch calls and the integration contract flow authors target directly (see integrating into a flow).
Commercial-grade engines — sign-off that analyzes and optimizers that
act on the result — each driven by a declarative job file that produces a
standard artifact. They share one cross-engine data spine (vyges-loom) — the
output of one is the input of the next, with no glue scripts:
.ext ─► vyges loom extract ─► .spef ──┐
.char ─► vyges loom char ─► .lib ──┼─► vyges loom sta-si ─► WNS / TNS ─► resize · vt-swap · buffer-insert ─► fixed netlist
└─► vyges loom power ─► activity ─┬─► vyges loom em-ir ─► IR-drop + EM
└─► vyges loom thermal ─► temp / hotspot
.gds + rules ─► vyges loom lvs ─► MATCH / MISMATCH
| Engine | Command | Job file | Output |
|---|---|---|---|
| char | vyges loom char | .char / .charlib | Liberty .lib |
| extract | vyges loom extract | .ext | SPEF |
| power | vyges loom power | .pwr | power report + activity map |
| sta-si | vyges loom sta-si | .sta | WNS / TNS / worst path |
| em-ir | vyges loom em-ir | .emir | IR-drop map + EM check |
| thermal | vyges loom thermal | .thermal | temperature field + hotspot |
| lvs | vyges loom lvs | .lvs | MATCH / MISMATCH + diagnostics |
Optimizers — they read the timer’s verdict and edit the netlist to fix it:
| Engine | Command | Job file | Output |
|---|---|---|---|
| resize | vyges loom resize | .resize | resized netlist (drive sizing) |
| vt-swap | vyges loom vt-swap | .vtswap | resized netlist (Vt / leakage) |
| buffer-insert | vyges loom buffer-insert | .bufins | buffered netlist (transition fix) |
Open core
Every engine is Apache-2.0 and runnable today. The per-foundry calibration plugins (NDA) stay private — the engine is open, the fab-specific accuracy is gated.
One declarative job in, one standard artifact out
No Tcl, no glue scripts: describe the job, get a standard sign-off file. The timing and power engines exit non-zero on a violation, so they gate CI directly. See job-file formats.