---
page_id: wsd-tinyqv-lvs-errors-b6a5fc13
type: context-page
schema_version: 1
template_id: discord-page
template_version: template-0.1.0
title: "Thread: tinyQV LVS errors"
slug: wsd-tinyqv-lvs-errors-b6a5fc13
route: /evidence/friends/tinytapeout/threads/tinyqv-lvs-errors
section: reference
access: public
summary: 10 Discord messages from 𐦂𖨆𐀪𖠋 - Friends/tinytapeout/threads/tinyqv-lvs-errors.md.
status: published
asset_base: .
home_href: /
md_url: /evidence/friends/tinytapeout/threads/tinyqv-lvs-errors.md
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tags: [discord, wafer-space, archive]
last_updated: 2026-08-19
talk_url: /evidence/friends/tinytapeout/threads/tinyqv-lvs-errors.talk.md
talk_route: /evidence/friends/tinytapeout/threads/tinyqv-lvs-errors/talk
---
# Thread: tinyQV LVS errors
Category: **𐦂𖨆𐀪𖠋 - Friends**
Parent channel: **#tinytapeout**
Thread ID: `1442175445356253216`
Messages: **10**
## message-1442223378936103002
**2025-11-23T18:40:48.753+00:00 — bailey (@bailey8889)**
- Message ID: `1442223378936103002`
- Author ID: `738396032295108721`
- Nickname: bailey
- User name: bailey8889
- Type: `21`
- Discord message: https://discord.com/channels/1361349522684510449/1442175445356253216/1442223378936103002
- Archive source: https://discord.wafer.space/wafer-space/%F0%90%A6%82%F0%96%A8%86%F0%90%80%AA%F0%96%A0%8B%20-%20Friends/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1409664261952639098/1442175445356253216
Reference data
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**Content**
```text
```
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---
## message-1442223382702592301
**2025-11-23T18:40:49.651+00:00 — bailey (@bailey8889)**
- Message ID: `1442223382702592301`
- Author ID: `738396032295108721`
- Nickname: bailey
- User name: bailey8889
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1442175445356253216/1442223382702592301
- Archive source: https://discord.wafer.space/wafer-space/%F0%90%A6%82%F0%96%A8%86%F0%90%80%AA%F0%96%A0%8B%20-%20Friends/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json
**Content**
````text
@RebelMike For some reason, netgen is thinking that flattening these cells will make a better match
```
Flattening instances of gf180mcu_fd_sc_mcu7t5v0__mux2_2 in cell tt_um_MichaelBell_tinyQV (0) makes a better match
Flattening instances of gf180mcu_fd_sc_mcu7t5v0__mux2_2 in cell tt_um_MichaelBell_tinyQV (1) makes a better match
Flattening instances of gf180mcu_fd_sc_mcu7t5v0__aoi21_4 in cell tt_um_MichaelBell_tinyQV (0) makes a better match
Flattening instances of gf180mcu_fd_sc_mcu7t5v0__aoi21_4 in cell tt_um_MichaelBell_tinyQV (1) makes a better match
Flattening instances of gf180mcu_fd_sc_mcu7t5v0__nand2_1 in cell tt_um_MichaelBell_tinyQV (0) makes a better match
Flattening instances of gf180mcu_fd_sc_mcu7t5v0__nand2_1 in cell tt_um_MichaelBell_tinyQV (1) makes a better match
Flattening instances of gf180mcu_fd_sc_mcu7t5v0__nand2_4 in cell tt_um_MichaelBell_tinyQV (0) makes a better match
Flattening instances of gf180mcu_fd_sc_mcu7t5v0__nand2_4 in cell tt_um_MichaelBell_tinyQV (1) makes a better match
Flattening instances of gf180mcu_fd_sc_mcu7t5v0__oai21_2 in cell tt_um_MichaelBell_tinyQV (0) makes a better match
Flattening instances of gf180mcu_fd_sc_mcu7t5v0__oai21_2 in cell tt_um_MichaelBell_tinyQV (1) makes a better match
Flattening instances of gf180mcu_fd_sc_mcu7t5v0__oai21_4 in cell tt_um_MichaelBell_tinyQV (0) makes a better match
Flattening instances of gf180mcu_fd_sc_mcu7t5v0__oai21_4 in cell tt_um_MichaelBell_tinyQV (1) makes a better match
```
````
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---
## message-1442223727202013268
**2025-11-23T18:42:11.786+00:00 — bailey (@bailey8889)**
- Message ID: `1442223727202013268`
- Author ID: `738396032295108721`
- Nickname: bailey
- User name: bailey8889
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1442175445356253216/1442223727202013268
- Archive source: https://discord.wafer.space/wafer-space/%F0%90%A6%82%F0%96%A8%86%F0%90%80%AA%F0%96%A0%8B%20-%20Friends/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json
**Content**
````text
However, flattening the abstract lef views that don't contain any devices causes a device mismatch.
```
gf180mcu_fd_sc_mcu7t5v0__and3_4 (1) |gf180mcu_fd_sc_mcu7t5v0__and3_4 (1)
(no matching element) |nfet_06v0 (12656->10959)
(no matching element) |pfet_06v0 (12656->10745)
Number of devices: 17150 **Mismatch** |Number of devices: 38854 **Mismatch**
Number of nets: 20323 **Mismatch** |Number of nets: 28705 **Mismatch**
```
````
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---
## message-1442224000649396441
**2025-11-23T18:43:16.981+00:00 — bailey (@bailey8889)**
- Message ID: `1442224000649396441`
- Author ID: `738396032295108721`
- Nickname: bailey
- User name: bailey8889
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1442175445356253216/1442224000649396441
- Archive source: https://discord.wafer.space/wafer-space/%F0%90%A6%82%F0%96%A8%86%F0%90%80%AA%F0%96%A0%8B%20-%20Friends/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json
**Content**
````text
As to why netgen wants to flatten those cells, there may be a clue in `62-magic-spiceextraction/magic-spiceextraction.log`
```
Warning: use i_peripherals.i_user_peri06.cordic_module.iter_stage.z\[0\]_gf180mcu_fd_sc_mcu7t5v0__dffq_1_Q_D_gf180mcu_fd_sc_mcu7t5v0__clkinv_1_ZN_I_gf180mcu_fd_sc_mcu7t5v0__oai211_1_ZN_B_gf180mcu_fd_sc_mcu7t5v0__oai221_1_ZN_A1_gf180mcu_fd_sc_mcu7t5v0__aoi21_1_ZN_A2_gf180mcu_fd_sc_mcu7t5v0__mux2_2_Z_I0_gf180mcu_fd_sc_mcu7t5v0__mux2_2_Z_I0_gf180mcu_fd_sc_mcu7t5v0__mux2_2_Z_I1_gf180mcu_fd_sc_mcu7t5v0__mux2_2_I0_Z_gf180mcu_fd_sc_mcu7t5v0__nand2_1_A2_ZN_gf180mcu_fd_sc_mcu7t5v0__oai21_1_B_ZN_gf180mcu_fd_sc_mcu7t5v0__mux2_2_I appears more than once in def!
Warning: use i_peripherals.i_user_peri06.cordic_module.iter_stage.z\[0\]_gf180mcu_fd_sc_mcu7t5v0__dffq_1_Q_D_gf180mcu_fd_sc_mcu7t5v0__clkinv_1_ZN_I_gf180mcu_fd_sc_mcu7t5v0__oai211_1_ZN_B_gf180mcu_fd_sc_mcu7t5v0__oai221_1_ZN_A1_gf180mcu_fd_sc_mcu7t5v0__aoi21_1_ZN_A2_gf180mcu_fd_sc_mcu7t5v0__mux2_2_Z_I1_gf180mcu_fd_sc_mcu7t5v0__mux2_2_Z_I1_gf180mcu_fd_sc_mcu7t5v0__mux2_2_Z_I1_gf180mcu_fd_sc_mcu7t5v0__mux2_2_I0_Z_gf180mcu_fd_sc_mcu7t5v0__nand2_1_A2_ZN_gf180mcu_fd_sc_mcu7t5v0__oai21_1_B_ZN_gf180mcu_fd_sc_mcu7t5v0__oai21_1_ appears more than once in def!
...
```
````
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---
## message-1442224252689317939
**2025-11-23T18:44:17.072+00:00 — bailey (@bailey8889)**
- Message ID: `1442224252689317939`
- Author ID: `738396032295108721`
- Nickname: bailey
- User name: bailey8889
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1442175445356253216/1442224252689317939
- Archive source: https://discord.wafer.space/wafer-space/%F0%90%A6%82%F0%96%A8%86%F0%90%80%AA%F0%96%A0%8B%20-%20Friends/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json
**Content**
```text
I don't know why yosys is generating such long instance names, but that is what I'd suggest someone looking into.
```
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---
## message-1442229947535069204
**2025-11-23T19:06:54.829+00:00 — bailey (@bailey8889)**
- Message ID: `1442229947535069204`
- Author ID: `738396032295108721`
- Nickname: bailey
- User name: bailey8889
- Type: `ChannelNameChange`
- Discord message: https://discord.com/channels/1361349522684510449/1442175445356253216/1442229947535069204
- Archive source: https://discord.wafer.space/wafer-space/%F0%90%A6%82%F0%96%A8%86%F0%90%80%AA%F0%96%A0%8B%20-%20Friends/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json
**Content**
```text
Changed the channel name: tinyQV LVS errors
```
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---
## message-1442232515250098196
**2025-11-23T19:17:07.02+00:00 — bailey (@bailey8889)**
- Message ID: `1442232515250098196`
- Author ID: `738396032295108721`
- Nickname: bailey
- User name: bailey8889
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1442175445356253216/1442232515250098196
- Archive source: https://discord.wafer.space/wafer-space/%F0%90%A6%82%F0%96%A8%86%F0%90%80%AA%F0%96%A0%8B%20-%20Friends/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json
**Content**
```text
Actually, I think magic is truncating the def instance names at around 511 bytes. @Tim Edwards
```
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---
## message-1442233741014728825
**2025-11-23T19:21:59.265+00:00 — bailey (@bailey8889)**
- Message ID: `1442233741014728825`
- Author ID: `738396032295108721`
- Nickname: bailey
- User name: bailey8889
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1442175445356253216/1442233741014728825
- Archive source: https://discord.wafer.space/wafer-space/%F0%90%A6%82%F0%96%A8%86%F0%90%80%AA%F0%96%A0%8B%20-%20Friends/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json
**Content**
````text
I found this in the magic repo that looks suspicious.
```
./lef/defRead.c: char usename[512];
```
````
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---
## message-1442250971303379065
**2025-11-23T20:30:27.286+00:00 — bailey (@bailey8889)**
- Message ID: `1442250971303379065`
- Author ID: `738396032295108721`
- Nickname: bailey
- User name: bailey8889
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1442175445356253216/1442250971303379065
- Archive source: https://discord.wafer.space/wafer-space/%F0%90%A6%82%F0%96%A8%86%F0%90%80%AA%F0%96%A0%8B%20-%20Friends/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json
**Content**
```text
Looks like there's already a PR to fix this.
```
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---
## message-1442275775813517473
**2025-11-23T22:09:01.142+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1442275775813517473`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1442175445356253216/1442275775813517473
- Archive source: https://discord.wafer.space/wafer-space/%F0%90%A6%82%F0%96%A8%86%F0%90%80%AA%F0%96%A0%8B%20-%20Friends/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Information/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json
**Content**
```text
And I just merged the PR. It will be available on github in about 10 hours, or you can get the update now from opencircuitdesign.com.
```
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