The-OpenROAD-Project/OpenROAD

Multi-cut vias are not yet supported in the detail router

Closed

#3,071 opened on Mar 23, 2023

View on GitHubContributor guide
 (21 comments) (0 reactions) (1 assignee)Verilog (903 forks)auto 404
Staledrtenhancementhelp wanted

Repository metrics

Stars
 (2,715 stars)
PR merge metrics
 (Avg merge 5d 12h) (136 merged PRs in 30d)

Description

Description

As stated in title, currently OpenROAD doesn't support multi-cut vias which could be a crucial functionality as shown in the figure below.(In FlewPR.cpp) So I believe it's impossible to set constraint in ndr rule for multi-cut vias since it's basically not support in the OpenROAD router.

image

Suggested Solution

Further modification need to be done for the router or create a new router just for multi-cut vias.

Additional Context

No response

Contributor guide

Research direction
Examine the FlePR router implementation to understand current via handling, then design and implement support for multi cut vias.
Tech stack
cpp
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitC++
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20