Thread: tinyQV LVS errors

10 Discord messages from 𐦂𖨆𐀪𖠋 - Friends/tinytapeout/threads/tinyqv-lvs-errors.md.

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
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Reply/reference

https://discord.com/channels/1361349522684510449/1409664261952639098/1442175445356253216

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Content

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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

@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

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
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Archive source: https://discord.wafer.space/wafer-space/Information/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json

Content

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

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
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Content

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
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Content

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
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Archive source: https://discord.wafer.space/wafer-space/Information/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json

Content

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
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Content

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
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Archive source: https://discord.wafer.space/wafer-space/Information/tinytapeout/tinyqv-lvs-errors/2025-11/2025-11.json

Content

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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