---
page_id: wsd-usb-c7c78da5
type: context-page
schema_version: 1
template_id: discord-page
template_version: template-0.1.0
title: "#🖱️-usb"
slug: wsd-usb-c7c78da5
route: /evidence/designing/usb
section: reference
access: public
summary: 23 Discord messages from 📐 - Designing/usb/channel.md.
status: published
asset_base: .
home_href: /
md_url: /evidence/designing/usb.md
toc_enabled: true
talk_enabled: false
agent_view_enabled: true
copy_buttons_enabled: true
footer_enabled: true
search_indexed: true
tags: [discord, wafer-space, archive]
last_updated: 2026-08-19
talk_url: /evidence/designing/usb.talk.md
talk_route: /evidence/designing/usb/talk
---

# #🖱️-usb

Category: **📐 - Designing**
Channel ID: `1508725695805919245`

Messages: **23**

## message-1508725866614624286

**2026-05-26T06:57:57.372+00:00 — Tim 'mithro' Ansell (@mithro_)**

- Message ID: `1508725866614624286`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1508725866614624286
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/usb/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/usb/2026-05/2026-05.json

**Content**

```text
@Greg - could you explain more about your USB stuff with Luna here?
```

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        "name": "greg.hashtag.9468",
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---

## message-1508726004456226888

**2026-05-26T06:58:30.236+00:00 — Tim 'mithro' Ansell (@mithro_)**

- Message ID: `1508726004456226888`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1508726004456226888
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/usb/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/usb/2026-05/2026-05.json

**Content**

```text
@tnt - I have already forgotten the state of your USB core on gf180mcu
```

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---

## message-1508726627620622336

**2026-05-26T07:00:58.81+00:00 — Tim 'mithro' Ansell (@mithro_)**

- Message ID: `1508726627620622336`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1508726627620622336
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/usb/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/usb/2026-05/2026-05.json

**Content**

```text
@Lofty - Have you had a chance to test your UTMI (or was it ULPI) interface yet?
```

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---

## message-1508726714560286740

**2026-05-26T07:01:19.538+00:00 — Lofty (@ravenslofty)**

- Message ID: `1508726714560286740`
- Author ID: `1187141985530818611`
- Nickname: Lofty
- User name: ravenslofty
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1508726714560286740
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/usb/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/usb/2026-05/2026-05.json

**Reply/reference**
- https://discord.com/channels/1361349522684510449/1508725695805919245/1508726627620622336
<details>
<summary>Reference data</summary>

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**Content**

```text
not yet (it was ULPI)
```

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---

## message-1508732973971931276

**2026-05-26T07:26:11.898+00:00 — RebelMike (@rebelmike)**

- Message ID: `1508732973971931276`
- Author ID: `691780627338625077`
- Nickname: RebelMike
- User name: rebelmike
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1508732973971931276
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/usb/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/usb/2026-05/2026-05.json

**Content**

```text
There’s https://tinytapeout.com/chips/ttgf0p2/tt_um_urish_usb_cdc on the run 1 Tiny Tapeout. I might grab that for the next TinyQV
```

**Embeds**

- Resolved media URL: https://tinytapeout.com/chips/ttgf0p2/tt_um_urish_usb_cdc
- Resolved media URL: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/usb/2026-05/2026-05_media/social-preview-CBA28
<details>
<summary>Embeds data</summary>

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    "description": "USB to UART bridge, 115200 baud rate",
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    "timestamp": null,
    "title": "130 USB CDC (Serial) Device - Tiny Tapeout",
    "url": "https://tinytapeout.com/chips/ttgf0p2/tt_um_urish_usb_cdc"
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```

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**Reactions**

- Resolved media URL: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/usb/2026-05/2026-05_media/1f44d-27259.svg
- Resolved media URL: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/usb/2026-05/2026-05_media/fb1d1a9872c8ef9ce08855c75f2963a7-A225D.png
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---

## message-1508752818494767215

**2026-05-26T08:45:03.201+00:00 — Tim 'mithro' Ansell (@mithro_)**

- Message ID: `1508752818494767215`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1508752818494767215
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/usb/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/usb/2026-05/2026-05.json

**Content**

```text
@urish - I think you showed that your USB-CDC design was working on the GF180MCU shuttle?
```

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---

## message-1508754073149771806

**2026-05-26T08:50:02.334+00:00 — tnt (@246tnt)**

- Message ID: `1508754073149771806`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1508754073149771806
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/usb/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/usb/2026-05/2026-05.json

**Content**

```text
I tested it. Although it's based off the tinyfpga code, so not sure exactly how "spec compliant" it is, I never ran test suites on it to validate behavior in the various edge cases.
```

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

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---

## message-1508755866323652738

**2026-05-26T08:57:09.86+00:00 — Tim 'mithro' Ansell (@mithro_)**

- Message ID: `1508755866323652738`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1508755866323652738
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/usb/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/usb/2026-05/2026-05.json

**Content**

```text
@Greg has been getting some stuff going @ https://github.com/gregdavill/tinyfpga-boot/actions
```

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---

## message-1508756404817756190

**2026-05-26T08:59:18.247+00:00 — Tim 'mithro' Ansell (@mithro_)**

- Message ID: `1508756404817756190`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1508756404817756190
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/usb/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/usb/2026-05/2026-05.json

**Content**

```text

```

**Attachments**

- Resolved media URL: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/usb/2026-05/2026-05_media/image-E42F2.png
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---

## message-1508759051725705216

**2026-05-26T09:09:49.319+00:00 — namibj**

- Message ID: `1508759051725705216`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1508759051725705216
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/usb/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/usb/2026-05/2026-05.json

**Content**

```text
Hmmm, I should get started pre-layout-SPICE plus then drawing the MCML cells (of proportions approximately matching what the simulations suggest to be ideal) for what I had planned to get into my ttsky26a tile (an MCML partial positive feedback 2-delay-cell VCO (no inductor) plus between a mere PA to launch the clock directly and a an actual serializer launching a PRBS-31 stream to allow estimating/prediction/measuring what TX equalizer parameters would be needed).

I do for now at least still have hope to squeeze a (if it had TX equalization done, at least) USB 3.0 SS (the 5Gbit/s stuff) compliant signal out of it on W.S.
```

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---

## message-1508759294579835033

**2026-05-26T09:10:47.22+00:00 — namibj**

- Message ID: `1508759294579835033`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1508759294579835033
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/usb/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/usb/2026-05/2026-05.json

**Content**

```text
I'm assuming we'd expect Run2 chips to hit testbenches at least a week before the GDS deadline for Run3?
```

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---

## message-1508771012341399663

**2026-05-26T09:57:20.952+00:00 — Lofty (@ravenslofty)**

- Message ID: `1508771012341399663`
- Author ID: `1187141985530818611`
- Nickname: Lofty
- User name: ravenslofty
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1508771012341399663
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/usb/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/usb/2026-05/2026-05.json

**Reply/reference**
- https://discord.com/channels/1361349522684510449/1508725695805919245/1508759051725705216
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**Content**

```text
Um, did you mean to post this in #🖱️-usb
```

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---

## message-1508774056738947103

**2026-05-26T10:09:26.793+00:00 — Tim 'mithro' Ansell (@mithro_)**

- Message ID: `1508774056738947103`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1508774056738947103
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/usb/2026-05/2026-05.json
- Archive source: https://discord.wafer.space/wafer-space/Information/usb/2026-05/2026-05.json

**Reply/reference**
- https://discord.com/channels/1361349522684510449/1508725695805919245/1508771012341399663
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**Content**

```text
He did say "hope to squeeze a USB 3.0 Super Speed compliant signal out of it on wafer.space"
```

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---

## message-1508774148552523886

**2026-05-26T10:09:48.683+00:00 — Tim 'mithro' Ansell (@mithro_)**

- Message ID: `1508774148552523886`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1508774148552523886
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/usb/2026-05/2026-05.json
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```text
I have yet to plan things that far ahead 😛
```

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---

## message-1508781706151198790

**2026-05-26T10:39:50.555+00:00 — Greg (@greg.hashtag.9468)**

- Message ID: `1508781706151198790`
- Author ID: `274535015969456128`
- Nickname: Greg
- User name: greg.hashtag.9468
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1508781706151198790
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/usb/2026-05/2026-05.json
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**Reply/reference**
- https://discord.com/channels/1361349522684510449/1508725695805919245/1508755866323652738
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**Content**

```text
I probably need to rename this at some point. Since with the luna backend it's supporting FS/HS(ULPI), and already builds for ECP5 and iCE40 targets. not just the tinyfpga bx.
```

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---

## message-1508790644817268826

**2026-05-26T11:15:21.699+00:00 — namibj**

- Message ID: `1508790644817268826`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1508790644817268826
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**Reply/reference**
- https://discord.com/channels/1361349522684510449/1508725695805919245/1508771012341399663
<details>
<summary>Reference data</summary>

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**Content**

```text
USB 3.0 5 Gbit/s SS, PCIe 2.0, and 5GBASE-KR (which is just a 10 Gbit/s SFP+ port's PHY but for backplane (think: where PCIe would have been a normal/expected sight) which is then called 10GBASE-KR, just clocked at half with adjusted error counter thresholds/timeouts) are the 5GBaud high speed standards I hope to be feasible on gf180mcuD with at least "usable" (if not spec-compliant) link margin, to connect to modern computers.

I'd expect PCIe to be the hardest to pull off (it's quite complicated), 5GBASE-KR to suffer from relatively expensive switch ports to get one's that'll do that speed (most only do 1G/10G[/25G]) but possibly lowest-overhead and lowest required buffer size (SRAM space usage!), and SS to be at most risk of sad trade-offs between SRAM allocation and feasible goodput.

With luck and prayers at least TX for 10GBASE-KR should be possible though and would allow cheap exfiltration of bulk data from a W.S die.
We'd know more after my SPICE trials that are looking for feasible frequency performance of the core buffer cell (needed for VCO and clock tree) and especially after that has hit layout (w/ PEX, to do post-layout SPICE of at least a VCO core and it's clock extraction/take-off clock tree buffers.
```

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---

## message-1508790988716376104

**2026-05-26T11:16:43.691+00:00 — namibj**

- Message ID: `1508790988716376104`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1508790988716376104
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**Reply/reference**
- https://discord.com/channels/1361349522684510449/1508725695805919245/1508774148552523886
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<summary>Reference data</summary>

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```text
Oh I thought you at least would have an expectation and probably a "yes, per current expectations, ofc conditional on Run3 even happening".
```

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---

## message-1508791025274196039

**2026-05-26T11:16:52.407+00:00 — Lofty (@ravenslofty)**

- Message ID: `1508791025274196039`
- Author ID: `1187141985530818611`
- Nickname: Lofty
- User name: ravenslofty
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1508791025274196039
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```text
I feel these might be possible on gf180bcd; gf180mcuD might be a stretch
```

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---

## message-1508824197223288993

**2026-05-26T13:28:41.216+00:00 — Tim 'mithro' Ansell (@mithro_)**

- Message ID: `1508824197223288993`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1508824197223288993
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/usb/2026-05/2026-05.json
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**Reply/reference**
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<summary>Reference data</summary>

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**Content**

```text
I think my goal is something like atleast 6-8 weeks between people getting back silicon and the next run closing
```

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---

## message-1508824310910025818

**2026-05-26T13:29:08.321+00:00 — Tim 'mithro' Ansell (@mithro_)**

- Message ID: `1508824310910025818`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1508824310910025818
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**Reply/reference**
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**Content**

```text
Possibly! But I'm not going to stop people from trying 🙂
```

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---

## message-1532878550892286062

**2026-07-31T22:32:06.039+00:00 — rahulbhagwat**

- Message ID: `1532878550892286062`
- Author ID: `488155070052171816`
- Nickname: rahulbhagwat
- User name: rahulbhagwat
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1532878550892286062
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**Reply/reference**
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```text
is gf180bcd a bicmos pdk? (looks like it's proprietary, plans of open sourcing from gf?)
```

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---

## message-1532879175764021409

**2026-07-31T22:34:35.02+00:00 — Lofty (@ravenslofty)**

- Message ID: `1532879175764021409`
- Author ID: `1187141985530818611`
- Nickname: Lofty
- User name: ravenslofty
- Type: `Reply`
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**Content**

```text
**b**ipolar-**c**mos-**d**mos
```

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---

## message-1532880998176522341

**2026-07-31T22:41:49.517+00:00 — namibj**

- Message ID: `1532880998176522341`
- Author ID: `262706220073222144`
- Nickname: namibj
- User name: namibj
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1508725695805919245/1532880998176522341
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**Reply/reference**
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```text
Further work has since shown that 10GBASE-R probably works on gf180mcuD; TX is basically just missing drawing up the actual clock tree, sizing the output multiplexer and output PA drivers, and figuring out the correct working phasing of the datapath from the 1.25GBit/s latches through the last MUX2 into the 2.5 GBit/s latches and then the output multiplexer itself.

Nothing major though.
I just didn't get to finish/polish/tune those parts in time for the Run2 deadline.

It's currently getting ported to IHP SG13cmos5L but will be back to gf180mcuD on, by current estimates, Run4 silicon.

My Run3 contributions will be for muxed e-test and maybe a couple isolated critical blocks that'll be needed for making a great transceiver on Run4 (verifying/adjusting models/quantifying oscillator noise to correctly set PLL bandwidths/etc.).
```

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---