[WARNING DPL-0004/5/6] Warning Details

Tool: Detailed Placement

Subcategory: Detailed Placement issue

Conversation

dineshannayya

Can any one give more details on the these WARNING & also how to solve these issue.

[WARNING DPL-0004] Placed in rows check failed (4). [WARNING DPL-0005] Overlap check failed (1). [WARNING DPL-0006] Site check failed (4).

I am trying to do detailed placement using openlane flow and 99% of block are hard core, only 32 cells are there at top-level There is good amount of free space available. still tool fails with these error.

maliberty

It is a check at the end of placement to make sure the result is non-overlapping. It suggests a placement failure but its hard to say anything more without a test case. Can you provide one?

dineshannayya

The project had 99% hard macro with less than 32 other cells and there was more than 30% free space. Still openroad detailed route was placing overlapping cells with hard macros & giving DPL-4/5/6 warning.

Finally I noticed the issue was resolved after changing diamond_search_hight more than 250.

Can give more details on how increased diamond_search_hight value helped here ?

On Thu, Jun 17, 2021 at 7:17 PM Matt Liberty @.***> wrote:

It is a check at the end of placement to make sure the result is non-overlapping. It suggests a placement failure but its hard to say anything more without a test case. Can you provide one?

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maliberty

I would guess that global placement left cells very far from any legal location. You might look at a post global-placement def to see.