---
page_id: wsd-failing-hold-checks-766fc288
type: context-page
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template_version: template-0.1.0
title: "Thread: Failing Hold Checks"
slug: wsd-failing-hold-checks-766fc288
route: /evidence/i-information/questions/threads/failing-hold-checks
section: reference
access: public
summary: 22 Discord messages from ℹ️ - Information/⁉️-questions/threads/failing-hold-checks.md.
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tags: [discord, wafer-space, archive]
last_updated: 2026-08-19
talk_url: /evidence/i-information/questions/threads/failing-hold-checks.talk.md
talk_route: /evidence/i-information/questions/threads/failing-hold-checks/talk
---

# Thread: Failing Hold Checks

Category: **ℹ️ - Information**
Parent channel: **#⁉️-questions**
Thread ID: `1445866342438932643`

Messages: **22**

## message-1445866342438932643

**2025-12-03T19:56:38.935+00:00 — Trevor Peyton (@trev5514)**

- Message ID: `1445866342438932643`
- Author ID: `805909190333038612`
- Nickname: Trevor Peyton
- User name: trev5514
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1445866342438932643/1445866342438932643
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/failing-hold-checks/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/failing-hold-checks/2025-12/2025-12.json

**Content**

```text
Has anyone been able to pass timing for hold checks on an 11MHz+ design? I have done everything I could think of, yet the corners still end up failing. The path is always pad -> reg nothing else.

I've tried these settings:

PL_RESIZER_HOLD_SLACK_MARGIN from 0.1, 0.3, 0.5 even 0.7 and none seem to make a difference (I do get less hold errors but all still fail)
I've tried PL_RESIZER_ALLOW_SETUP_VIOS

and

set_input_delay -min 0, .5, 1, 1.5

Any ideas?
```

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## message-1445869250244902994

**2025-12-03T20:08:12.21+00:00 — Leo Moser (mole99) (@mole99)**

- Message ID: `1445869250244902994`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1445866342438932643/1445869250244902994
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/failing-hold-checks/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/failing-hold-checks/2025-12/2025-12.json

**Content**

```text
Perhaps an unbalanced clock tree? You can view the clock tree in OpenROAD GUI.
```

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---

## message-1445870302926999744

**2025-12-03T20:12:23.189+00:00 — Lofty (@ravenslofty)**

- Message ID: `1445870302926999744`
- Author ID: `1187141985530818611`
- Nickname: Lofty
- User name: ravenslofty
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1445866342438932643/1445870302926999744
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/failing-hold-checks/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/failing-hold-checks/2025-12/2025-12.json

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**Content**

```text
sure; I've passed hold checks on a 60MHz design :p
```

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---

## message-1445870444174376973

**2025-12-03T20:12:56.865+00:00 — Lofty (@ravenslofty)**

- Message ID: `1445870444174376973`
- Author ID: `1187141985530818611`
- Nickname: Lofty
- User name: ravenslofty
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1445866342438932643/1445870444174376973
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- Archive source: https://discord.wafer.space/wafer-space/Information/questions/failing-hold-checks/2025-12/2025-12.json

**Content**

```text
I do often need to ECO some hold buffers in though
```

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## message-1445871889712021636

**2025-12-03T20:18:41.508+00:00 — Trevor Peyton (@trev5514)**

- Message ID: `1445871889712021636`
- Author ID: `805909190333038612`
- Nickname: Trevor Peyton
- User name: trev5514
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1445866342438932643/1445871889712021636
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/failing-hold-checks/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/failing-hold-checks/2025-12/2025-12.json

**Content**

```text
With the exception of the right spot which I'll look into it looks very balanced.
```

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## message-1445872139713511555

**2025-12-03T20:19:41.113+00:00 — Trevor Peyton (@trev5514)**

- Message ID: `1445872139713511555`
- Author ID: `805909190333038612`
- Nickname: Trevor Peyton
- User name: trev5514
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1445866342438932643/1445872139713511555
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/failing-hold-checks/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/failing-hold-checks/2025-12/2025-12.json

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**Content**

```text
Do you manually place them in? Did you change your input/output delays or do you use the templates default 0 for min?
```

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---

## message-1445872535160885409

**2025-12-03T20:21:15.395+00:00 — Lofty (@ravenslofty)**

- Message ID: `1445872535160885409`
- Author ID: `1187141985530818611`
- Nickname: Lofty
- User name: ravenslofty
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1445866342438932643/1445872535160885409
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/failing-hold-checks/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/failing-hold-checks/2025-12/2025-12.json

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**Content**

```text
read `54-openroad-stapostpnr/summary.rpt` to find the failing corners, then look at `54-openroad-stapostpnr/<corner>/min.rpt` to find the failing paths, and then [follow the docs](https://librelane.readthedocs.io/en/latest/usage/using_ecos.html)
```

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---

## message-1445872687925690498

**2025-12-03T20:21:51.817+00:00 — Lofty (@ravenslofty)**

- Message ID: `1445872687925690498`
- Author ID: `1187141985530818611`
- Nickname: Lofty
- User name: ravenslofty
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1445866342438932643/1445872687925690498
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/failing-hold-checks/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/failing-hold-checks/2025-12/2025-12.json

**Content**

```text
it's manual in that you have to point the tooling at the cell you want to insert a hold buffer for, but there's no physical placement or such
```

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## message-1445873529651204217

**2025-12-03T20:25:12.5+00:00 — Trevor Peyton (@trev5514)**

- Message ID: `1445873529651204217`
- Author ID: `805909190333038612`
- Nickname: Trevor Peyton
- User name: trev5514
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1445866342438932643/1445873529651204217
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- Archive source: https://discord.wafer.space/wafer-space/Information/questions/failing-hold-checks/2025-12/2025-12.json

**Content**

```text
Thank you, I have been looking at those corners but I didn't know about the ECO step!
```

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## message-1445873775194279936

**2025-12-03T20:26:11.042+00:00 — Lofty (@ravenslofty)**

- Message ID: `1445873775194279936`
- Author ID: `1187141985530818611`
- Nickname: Lofty
- User name: ravenslofty
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1445866342438932643/1445873775194279936
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**Content**

```text
(the downside of having a 60MHz design is that I have basically given up on meeting slow corner setup without major cheating)
```

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## message-1445874188090081450

**2025-12-03T20:27:49.484+00:00 — Trevor Peyton (@trev5514)**

- Message ID: `1445874188090081450`
- Author ID: `805909190333038612`
- Nickname: Trevor Peyton
- User name: trev5514
- Type: `Default`
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```text
My original target was 90MHz and now I'm just trying to get any passing. I'm currently failing 10MHz...
```

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## message-1445874418621485189

**2025-12-03T20:28:44.447+00:00 — Lofty (@ravenslofty)**

- Message ID: `1445874418621485189`
- Author ID: `1187141985530818611`
- Nickname: Lofty
- User name: ravenslofty
- Type: `Default`
- Edited: 2025-12-03T20:28:48.471+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1445866342438932643/1445874418621485189
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/failing-hold-checks/2025-12/2025-12.json
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```text
are you using the 9-track libraries?
```

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## message-1445875058063970425

**2025-12-03T20:31:16.902+00:00 — Trevor Peyton (@trev5514)**

- Message ID: `1445875058063970425`
- Author ID: `805909190333038612`
- Nickname: Trevor Peyton
- User name: trev5514
- Type: `Default`
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**Content**

```text
Whatever the default one is.
```

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## message-1445875652225011933

**2025-12-03T20:33:38.561+00:00 — Lofty (@ravenslofty)**

- Message ID: `1445875652225011933`
- Author ID: `1187141985530818611`
- Nickname: Lofty
- User name: ravenslofty
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1445866342438932643/1445875652225011933
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**Content**

```text
7-track. Try adding `STD_CELL_LIBRARY: gf180mcu_fd_sc_mcu9t5v0` to your `librelane/config.yaml`
```

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## message-1445876161984069644

**2025-12-03T20:35:40.097+00:00 — Trevor Peyton (@trev5514)**

- Message ID: `1445876161984069644`
- Author ID: `805909190333038612`
- Nickname: Trevor Peyton
- User name: trev5514
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1445866342438932643/1445876161984069644
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/failing-hold-checks/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/failing-hold-checks/2025-12/2025-12.json

**Content**

```text
I'll give it a go after I try ECO. Surely 10MHz is possible with the 7-track? At this point - what do I know haha!
```

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---

## message-1445881315307159684

**2025-12-03T20:56:08.745+00:00 — Trevor Peyton (@trev5514)**

- Message ID: `1445881315307159684`
- Author ID: `805909190333038612`
- Nickname: Trevor Peyton
- User name: trev5514
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1445866342438932643/1445881315307159684
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/failing-hold-checks/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/failing-hold-checks/2025-12/2025-12.json

**Content**

```text
@Lofty Did you ever run into unconnected ECO pins after the eco step?
```

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---

## message-1445884346933186621

**2025-12-03T21:08:11.541+00:00 — Trevor Peyton (@trev5514)**

- Message ID: `1445884346933186621`
- Author ID: `805909190333038612`
- Nickname: Trevor Peyton
- User name: trev5514
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1445866342438932643/1445884346933186621
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/failing-hold-checks/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/failing-hold-checks/2025-12/2025-12.json

**Content**

```text
Looks like the disconnected pins are pwr/gnd: eco_buffer_0/VDD, eco_buffer_0/VNW, eco_buffer_0/VPW, and eco_buffer_0/VSS
```

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---

## message-1445885538736541748

**2025-12-03T21:12:55.689+00:00 — Greg (@greg.hashtag.9468)**

- Message ID: `1445885538736541748`
- Author ID: `274535015969456128`
- Nickname: Greg
- User name: greg.hashtag.9468
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1445866342438932643/1445885538736541748
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/failing-hold-checks/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/failing-hold-checks/2025-12/2025-12.json

**Content**

```text
What does your I/O connect to? If it's not actually driven synchronously alongside your clock input. You may be able to further relax the timing.
With a `input_delay -min 0` you're telling the tools, the external i/o arrives with the clock. So it tries to add 4ns of delay to ensure a leaf in your clock tree.
```

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---

## message-1445885936578728008

**2025-12-03T21:14:30.542+00:00 — Trevor Peyton (@trev5514)**

- Message ID: `1445885936578728008`
- Author ID: `805909190333038612`
- Nickname: Trevor Peyton
- User name: trev5514
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1445866342438932643/1445885936578728008
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/failing-hold-checks/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/failing-hold-checks/2025-12/2025-12.json

**Content**

```text
Everything is synchronous with the clock input.
```

<details>
<summary>Other message metadata</summary>

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---

## message-1445907135476011179

**2025-12-03T22:38:44.753+00:00 — BreakingTaps (@polyfractal)**

- Message ID: `1445907135476011179`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1445866342438932643/1445907135476011179
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/failing-hold-checks/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/failing-hold-checks/2025-12/2025-12.json

**Content**

```text
(oof, did not know about ECO or 9T stuff either. probably would have saved a lot of agony fussing with settings 😅 )
```

<details>
<summary>Other message metadata</summary>

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---

## message-1445907388228960383

**2025-12-03T22:39:45.014+00:00 — Trevor Peyton (@trev5514)**

- Message ID: `1445907388228960383`
- Author ID: `805909190333038612`
- Nickname: Trevor Peyton
- User name: trev5514
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1445866342438932643/1445907388228960383
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/failing-hold-checks/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/failing-hold-checks/2025-12/2025-12.json

**Content**

```text
Maybe, ECO isn't working for me still and neither is the 9T
```

<details>
<summary>Other message metadata</summary>

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</details>

---

## message-1445910109375959070

**2025-12-03T22:50:33.786+00:00 — Trevor Peyton (@trev5514)**

- Message ID: `1445910109375959070`
- Author ID: `805909190333038612`
- Nickname: Trevor Peyton
- User name: trev5514
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1445866342438932643/1445910109375959070
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/failing-hold-checks/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/failing-hold-checks/2025-12/2025-12.json

**Content**

```text
For anyone that runs into the ECO issue:

"+OpenROAD.DetailedRouting": "Odb.InsertECOBuffers"
 "+Odb.InsertECOBuffers": "OpenROAD.DetailedRouting"

I haven't confirmed yet, but I added the Odb.InsertECOBuffers step but I didn't add the routing after which likely left the ECO buffers unconnected.
```

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---