---
page_id: wsd-drc-error-cap-31aad276
type: context-page
schema_version: 1
template_id: discord-page
template_version: template-0.1.0
title: "Thread: DRC error Cap"
slug: wsd-drc-error-cap-31aad276
route: /evidence/i-information/questions/threads/drc-error-cap
section: reference
access: public
summary: 13 Discord messages from ℹ️ - Information/⁉️-questions/threads/drc-error-cap.md.
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tags: [discord, wafer-space, archive]
last_updated: 2026-08-19
talk_url: /evidence/i-information/questions/threads/drc-error-cap.talk.md
talk_route: /evidence/i-information/questions/threads/drc-error-cap/talk
---

# Thread: DRC error Cap

Category: **ℹ️ - Information**
Parent channel: **#⁉️-questions**
Thread ID: `1444137681712971898`

Messages: **13**

## message-1444137681712971898

**2025-11-29T01:27:34.101+00:00 — Mehdi (@enited)**

- Message ID: `1444137681712971898`
- Author ID: `476871702106603546`
- Nickname: Mehdi
- User name: enited
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444137681712971898/1444137681712971898
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/drc-error-cap/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/drc-error-cap/2025-11/2025-11.json

**Content**

```text
this error does not seem to be solvable. it does not even make sense. if you know the answer, I would appreciate it. It is a DRC error that comes from the cap. apparently it says the bottom plate should be wider than the top ones. and that is what is already there
```

**Attachments**

- Resolved media URL: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/drc-error-cap/2025-11/2025-11_media/image-17B9D.png
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## message-1444138600454291621

**2025-11-29T01:31:13.146+00:00 — Tim 'mithro' Ansell (@mithro_)**

- Message ID: `1444138600454291621`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444137681712971898/1444138600454291621
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/drc-error-cap/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/drc-error-cap/2025-11/2025-11.json

**Content**

```text
@Leo Moser (mole99) / @Tim Edwards - Any idea?
```

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## message-1444138894986579989

**2025-11-29T01:32:23.368+00:00 — Hateemx (@hateemx)**

- Message ID: `1444138894986579989`
- Author ID: `733031319222878339`
- Nickname: Hateemx
- User name: hateemx
- Type: `Default`
- Edited: 2025-11-29T01:32:56.147+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1444137681712971898/1444138894986579989
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/drc-error-cap/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/drc-error-cap/2025-11/2025-11.json

**Content**

```text
more context: that is the cap, between 5 and 6. just being instantiated results in that error
```

**Attachments**

- Resolved media URL: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/drc-error-cap/2025-11/2025-11_media/image-3F8F6.png
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## message-1444152348866773082

**2025-11-29T02:25:51.023+00:00 — bailey (@bailey8889)**

- Message ID: `1444152348866773082`
- Author ID: `738396032295108721`
- Nickname: bailey
- User name: bailey8889
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444137681712971898/1444152348866773082
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/drc-error-cap/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/drc-error-cap/2025-11/2025-11.json

**Content**

````text
@Hateemx Here're the relevant rules from the klayout technology. Sorry if the explanation is too long.
```
  mimtm_virtual = fusetop.sized(1.06.um).and(topmin1_metal.interacting(fusetop))
...
  # Rule MIMTM.3: Minimum MiM bottom plate overlap of Top plate.
  logger.info('Executing rule MIMTM.3')
  mimtm3_l1 = fusetop.enclosed(mimtm_virtual, 0.6.um).polygons(0.001.um)
  mimtm3_l2 = fusetop.not_inside(mimtm_virtual)
  mimtm3_l = mimtm3_l1.join(mimtm3_l2)
  mimtm3_l.output('MIMTM.3', 'MIMTM.3 : Minimum MiM bottom plate overlap of Top plate.')
```
When `METAL_LEVEL = 5LM`, `top_min1_metal = metal4`

So `mimtm_virtual` is the intersection of `fusetop` layer grown by 1.06 and `metal4`.
The first part of the rule, `mimtm3_l1` checks that `metal4` encloses `fusetop` by 0.6um.
The second part of the rule `mimtm3_l2` checks for `fusetop` outside of `metal4`.

Note that this rule is checking `metal4` and `fusetop` not `metal4` and `metal5`.
````

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---

## message-1444153581165875210

**2025-11-29T02:30:44.826+00:00 — Hateemx (@hateemx)**

- Message ID: `1444153581165875210`
- Author ID: `733031319222878339`
- Nickname: Hateemx
- User name: hateemx
- Type: `Default`
- Edited: 2025-11-29T02:32:10.306+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1444137681712971898/1444153581165875210
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/drc-error-cap/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/drc-error-cap/2025-11/2025-11.json

**Content**

```text
thanks, the cap is between 5 and 6. and the fusetop is enclosed by 0.6um. I even tried extending metal 5 even more, but no change
```

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## message-1444166320366162040

**2025-11-29T03:21:22.088+00:00 — Tim 'mithro' Ansell (@mithro_)**

- Message ID: `1444166320366162040`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444137681712971898/1444166320366162040
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/drc-error-cap/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/drc-error-cap/2025-11/2025-11.json

**Content**

```text
@Hateemx - It's probably a good idea to commit your changes somewhere and share your GDS for other people to look at.
```

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---

## message-1444167500966268928

**2025-11-29T03:26:03.565+00:00 — Tim Edwards (@rtimothyedwards_19428)**

- Message ID: `1444167500966268928`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444137681712971898/1444167500966268928
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/drc-error-cap/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/drc-error-cap/2025-11/2025-11.json

**Content**

```text
The problem is that "the cap is between 5 and 6" but this process has only 5 metals.
```

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## message-1444167719351226511

**2025-11-29T03:26:55.632+00:00 — bailey (@bailey8889)**

- Message ID: `1444167719351226511`
- Author ID: `738396032295108721`
- Nickname: bailey
- User name: bailey8889
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444137681712971898/1444167719351226511
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/drc-error-cap/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/drc-error-cap/2025-11/2025-11.json

**Content**

```text
@Hateemx When you say between 5 and 6, do you mean metal5 and metal6? Is this process `6LM` and not `5LM`?
```

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---

## message-1444168327860715602

**2025-11-29T03:29:20.712+00:00 — Hateemx (@hateemx)**

- Message ID: `1444168327860715602`
- Author ID: `733031319222878339`
- Nickname: Hateemx
- User name: hateemx
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444137681712971898/1444168327860715602
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/drc-error-cap/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/drc-error-cap/2025-11/2025-11.json

**Content**

```text
Yes metal 5 and 6. There is no metal 6 yes I thought it is the same as “top metal” but now I get it. I was just using the 2f0F cap and thought it corresponds to that
```

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## message-1444171140661772329

**2025-11-29T03:40:31.336+00:00 — bailey (@bailey8889)**

- Message ID: `1444171140661772329`
- Author ID: `738396032295108721`
- Nickname: bailey
- User name: bailey8889
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444137681712971898/1444171140661772329
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/drc-error-cap/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/drc-error-cap/2025-11/2025-11.json

**Content**

```text
@Hateemx If it's a pcell, there might be an option to specify the lower and/or upper layer.
```

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---

## message-1444180327114473564

**2025-11-29T04:17:01.557+00:00 — Hateemx (@hateemx)**

- Message ID: `1444180327114473564`
- Author ID: `733031319222878339`
- Nickname: Hateemx
- User name: hateemx
- Type: `Default`
- Edited: 2025-11-29T04:17:19.182+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1444137681712971898/1444180327114473564
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/drc-error-cap/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/drc-error-cap/2025-11/2025-11.json

**Content**

```text
The Pcell is called mimcap, without specifying capacitance densities. I can use lower metals but i am mot sure how the density works. So what if it is an M4/M5 cap?
```

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## message-1444236820249317426

**2025-11-29T08:01:30.57+00:00 — Leo Moser (mole99) (@mole99)**

- Message ID: `1444236820249317426`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444137681712971898/1444236820249317426
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/drc-error-cap/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/drc-error-cap/2025-11/2025-11.json

**Content**

```text
There's MIM option A and B:

- https://gf180mcu-pdk.readthedocs.io/en/latest/physical_verification/design_manual/drm_10_4_1.html
- https://gf180mcu-pdk.readthedocs.io/en/latest/physical_verification/design_manual/drm_10_4_2.html

Afaik this is the stack up we use: https://gf180mcu-pdk.readthedocs.io/en/latest/analog/layout/inter_specs/inter_specs_3_43.html

So the MIM cap should be on top of Metal4.
```

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---

## message-1444352997915099259

**2025-11-29T15:43:09.484+00:00 — Hateemx (@hateemx)**

- Message ID: `1444352997915099259`
- Author ID: `733031319222878339`
- Nickname: Hateemx
- User name: hateemx
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1444137681712971898/1444352997915099259
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/%E2%81%89%EF%B8%8F-questions/drc-error-cap/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/questions/drc-error-cap/2025-11/2025-11.json

**Content**

```text
Thanks everyone!
```

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    "avatarUrl": "2025-11_media/42977590f2eb075d0eb6b48f02566b7e-3B288.png",
    "discriminator": "0000",
    "isBot": false
  },
  "message": {}
}
```

</details>

---