The-OpenROAD-Project/OpenROAD

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

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#3,071 opened on Mar 23, 2023

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 (21 comments) (0 reactions) (1 assignee)Verilog (2,715 stars) (903 forks)auto 404
Staledrtenhancementhelp wanted

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

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
Research direction
Examine the FlePR router implementation to understand current via handling, then design and implement support for multi cut vias.