---
page_id: wsd-bio-the-bao-i-a0132c42
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title: "Thread: BIO - The Bao I-O Co-Processor"
slug: wsd-bio-the-bao-i-a0132c42
route: /evidence/designing/digital/threads/bio-the-bao-i
section: reference
access: public
summary: 15 Discord messages from π - Designing/π»-digital/threads/bio-the-bao-i.md.
status: published
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tags: [discord, wafer-space, archive]
last_updated: 2026-08-19
talk_url: /evidence/designing/digital/threads/bio-the-bao-i.talk.md
talk_route: /evidence/designing/digital/threads/bio-the-bao-i/talk
---
# Thread: BIO - The Bao I-O Co-Processor
Category: **π - Designing**
Parent channel: **#π»-digital**
Thread ID: `1516825766879428760`
Messages: **15**
## message-1516842913839976519
**2026-06-17T16:32:12.238+00:00 β BreakingTaps (@polyfractal)**
- Message ID: `1516842913839976519`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `21`
- Discord message: https://discord.com/channels/1361349522684510449/1516825766879428760/1516842913839976519
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/digital/bio-the-bao-i/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/%F0%9F%92%BB-digital/bio-the-bao-i/2026-06/2026-06.json
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- https://discord.com/channels/1361349522684510449/1409664140196188251/1516825766879428760
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```text
```
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---
## message-1516842919053754509
**2026-06-17T16:32:13.481+00:00 β BreakingTaps (@polyfractal)**
- Message ID: `1516842919053754509`
- Author ID: `384390069412429834`
- Nickname: BreakingTaps
- User name: polyfractal
- Type: `Default`
- Edited: 2026-06-17T16:33:07.201+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1516825766879428760/1516842919053754509
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/digital/bio-the-bao-i/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/%F0%9F%92%BB-digital/bio-the-bao-i/2026-06/2026-06.json
**Content**
```text
Dunno if it's possible, but some potential things to try:
- Place four macros at top and four at bottom, so that the logic can reach in from both sides. Each core will route top or bottom. I bet that will help a lot with your congestion and timing
- Make sure the macros are oriented so the inputs are facing the logic
- Enable post GRT repair passes (`RUN_POST_GRT_DESIGN_REPAIR: true`, `RUN_POST_GRT_RESIZER_TIMING: true`) if you haven't already, might be able to fix
- try giving the placer more room to move cells around (`PL_MAX_DISPLACEMENT_X`, `PL_MAX_DISPLACEMENT_Y`)
- If you can get timing sorta close, you can often fix up the design with some tweaks to slack margins (`PL_RESIZER_HOLD_SLACK_MARGIN`, `GRT_RESIZER_HOLD_SLACK_MARGIN`, `PL_RESIZER_SETUP_SLACK_MARGIN`, `GRT_RESIZER_SETUP_SLACK_MARGIN`)
- Decreasing the clock rate is always an option too if the violations are `setup`
```
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---
## message-1516847436423889039
**2026-06-17T16:50:10.506+00:00 β RebelMike (@rebelmike)**
- Message ID: `1516847436423889039`
- Author ID: `691780627338625077`
- Nickname: RebelMike
- User name: rebelmike
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1516825766879428760/1516847436423889039
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/digital/bio-the-bao-i/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/%F0%9F%92%BB-digital/bio-the-bao-i/2026-06/2026-06.json
**Content**
```text
Very cool! I'd like to do something with BIO too in future π
A couple of extra thoughts:
- The SRAM macros are currently cutting the power ring, which is not good, they need moving in very slightly to avoid that.
- I would close them up so there's not a small row of standard cells between each, and have them tight to the top/bottom as well as left/right. That should increase the usable logic area a bit.
What placement density are you using at the moment? And what step errors out?
```
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---
## message-1516853763636465907
**2026-06-17T17:15:19.031+00:00 β Deepak (@deempak)**
- Message ID: `1516853763636465907`
- Author ID: `797470890765582377`
- Nickname: Deepak
- User name: deempak
- Type: `Reply`
- Edited: 2026-06-17T17:18:57.053+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1516825766879428760/1516853763636465907
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/digital/bio-the-bao-i/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/%F0%9F%92%BB-digital/bio-the-bao-i/2026-06/2026-06.json
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- https://discord.com/channels/1361349522684510449/1516825766879428760/1516847436423889039
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**Content**
```text
I have kept it pl desnitu to 50 , the flow does not error out however the flow had been runnign for 18 hours and in detailed placement i am not getting near zero violation there are kind of stuck at
Completing 10% with 560691 violations. even after 15 iteration so i check the logs and output of the global routing first and found these logs
[GRT-0115] Global routing finished with congestion
and NDR for a lot of clock
" [GRT-0273] Disabled NDR (to reduce congestion) for net: clknet_0_clk_PAD2CORE_regs
[GRT-0273] Disabled NDR (to reduce congestion) for net: i_chip_core.u_bio_lite.u_bio.mach\[0\].core.clk
[GRT-0273] Disabled NDR (to reduce congestion) for net: clknet_1_1_0_clk_PAD2CORE_regs
[GRT-0273] Disabled NDR (to reduce congestion) for net: clknet_0_i_chip_core.u_bio_lite.u_bio.mach\[1\].core.clk"
This is repeated lot to times
Thus i concluded that its higly lickely becouse fo congestion that viltation are not conversing to zero.
```
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---
## message-1516853856053628969
**2026-06-17T17:15:41.065+00:00 β Deepak (@deempak)**
- Message ID: `1516853856053628969`
- Author ID: `797470890765582377`
- Nickname: Deepak
- User name: deempak
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1516825766879428760/1516853856053628969
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/digital/bio-the-bao-i/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/%F0%9F%92%BB-digital/bio-the-bao-i/2026-06/2026-06.json
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```text
And thank i will try the suggestion that you mentioned and check with them
```
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---
## message-1516854751265034292
**2026-06-17T17:19:14.5+00:00 β RebelMike (@rebelmike)**
- Message ID: `1516854751265034292`
- Author ID: `691780627338625077`
- Nickname: RebelMike
- User name: rebelmike
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1516825766879428760/1516854751265034292
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/digital/bio-the-bao-i/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/%F0%9F%92%BB-digital/bio-the-bao-i/2026-06/2026-06.json
**Content**
```text
That's a lot of violations! What utilization does global placement report? One thing that's changed is it no longer fails if the utilization is higher than the placement density, it just ups the density.
```
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---
## message-1516854753777287280
**2026-06-17T17:19:15.099+00:00 β Deepak (@deempak)**
- Message ID: `1516854753777287280`
- Author ID: `797470890765582377`
- Nickname: Deepak
- User name: deempak
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1516825766879428760/1516854753777287280
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/digital/bio-the-bao-i/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/%F0%9F%92%BB-digital/bio-the-bao-i/2026-06/2026-06.json
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- https://discord.com/channels/1361349522684510449/1516825766879428760/1516842919053754509
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```text
Thank you will try these approach , I hope i am to get better run with these.
```
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---
## message-1516861348343185438
**2026-06-17T17:45:27.366+00:00 β Deepak (@deempak)**
- Message ID: `1516861348343185438`
- Author ID: `797470890765582377`
- Nickname: Deepak
- User name: deempak
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1516825766879428760/1516861348343185438
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/digital/bio-the-bao-i/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/%F0%9F%92%BB-digital/bio-the-bao-i/2026-06/2026-06.json
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**Content**
```text
For global placement it is in the limit of half Widht howerver in the global routing it had
Total Overflow: 64,732
Layer Metal3 Max Overflow: 24,363
And i just realize the global routing ran for 7 h
The log for global placement
[INFO ODB-0403] 0 connections made, 0 conflicts skipped.
Updating metricsβ¦
Cell type report: Count Area
Macro 13 1799404.12
Input pad 6 157500.00
Input/output pad 50 1312500.00
Power pad 16 420000.00
Pad spacer 738 1983800.00
Endcap cell 2164 513583.26
Tap cell 17237 75677.32
Tie cell 279 2449.84
Inverter 1212 10642.33
Clock gate cell 2 122.93
Sequential cell 4779 314818.02
Multi-Input combinational cell 30548 597895.65
Total 57044 7188393.48
```
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---
## message-1516861629529063546
**2026-06-17T17:46:34.406+00:00 β RebelMike (@rebelmike)**
- Message ID: `1516861629529063546`
- Author ID: `691780627338625077`
- Nickname: RebelMike
- User name: rebelmike
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1516825766879428760/1516861629529063546
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**Content**
````text
Near the top there'll be a line like ```
[INFO GPL-0019] Utilization: 58.988 %
```
````
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---
## message-1516861919145889853
**2026-06-17T17:47:43.456+00:00 β Deepak (@deempak)**
- Message ID: `1516861919145889853`
- Author ID: `797470890765582377`
- Nickname: Deepak
- User name: deempak
- Type: `Reply`
- Edited: 2026-06-17T17:47:53.19+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1516825766879428760/1516861919145889853
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/digital/bio-the-bao-i/2026-06/2026-06.json
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[INFO GPL-0019] Utilization: 40.319 %
[INFO GPL-0020] Standard cells area: 1035590.191 um^2
does thsi include sram area as well ?
```
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---
## message-1516862554247532555
**2026-06-17T17:50:14.876+00:00 β RebelMike (@rebelmike)**
- Message ID: `1516862554247532555`
- Author ID: `691780627338625077`
- Nickname: RebelMike
- User name: rebelmike
- Type: `Default`
- Edited: 2026-06-17T17:50:26.78+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1516825766879428760/1516862554247532555
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/digital/bio-the-bao-i/2026-06/2026-06.json
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**Content**
```text
That is utilization of the area for standard cells. 40% should normally be routable so hopefully you can resolve it by moving your macros around as BreakingTaps suggested. Separating the RAM for the two cores so one is pulled to the bottom and the other to the top does sound like it should make things work much better.
```
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---
## message-1516863094381613256
**2026-06-17T17:52:23.654+00:00 β Deepak (@deempak)**
- Message ID: `1516863094381613256`
- Author ID: `797470890765582377`
- Nickname: Deepak
- User name: deempak
- Type: `Reply`
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- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/%F0%9F%92%BB-digital/bio-the-bao-i/2026-06/2026-06.json
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- https://discord.com/channels/1361349522684510449/1516825766879428760/1516862554247532555
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```text
Sure will try that out Just one more question These overflow as i mentioned previously they should be zero right ?
```
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---
## message-1516863426205319169
**2026-06-17T17:53:42.767+00:00 β Deepak (@deempak)**
- Message ID: `1516863426205319169`
- Author ID: `797470890765582377`
- Nickname: Deepak
- User name: deempak
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1516825766879428760/1516863426205319169
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/digital/bio-the-bao-i/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/%F0%9F%92%BB-digital/bio-the-bao-i/2026-06/2026-06.json
**Content**
```text
[INFO GRT-0096] Final congestion report:
Layer Resource Demand Usage (%) Max H / Max V / Total Overflow
---------------------------------------------------------------------------------------
Metal1 0 0 0.00% 0 / 0 / 0
Metal2 565781 278898 49.29% 2 / 20 / 17928
Metal3 587172 285760 48.67% 28 / 1 / 24363
Metal4 714895 248151 34.71% 2 / 19 / 15516
Metal5 467870 126841 27.11% 8 / 1 / 6925
---------------------------------------------------------------------------------------
Total 2335718 939650 40.23% 40 / 41 / 64732
These onces
```
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---
## message-1516864224931086456
**2026-06-17T17:56:53.198+00:00 β RebelMike (@rebelmike)**
- Message ID: `1516864224931086456`
- Author ID: `691780627338625077`
- Nickname: RebelMike
- User name: rebelmike
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1516825766879428760/1516864224931086456
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/digital/bio-the-bao-i/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/%F0%9F%92%BB-digital/bio-the-bao-i/2026-06/2026-06.json
**Content**
```text
Yeah, those should ideally be zero or at least close to zero (maybe 100s, IIRC)
```
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---
## message-1516876170925314212
**2026-06-17T18:44:21.345+00:00 β Deepak (@deempak)**
- Message ID: `1516876170925314212`
- Author ID: `797470890765582377`
- Nickname: Deepak
- User name: deempak
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1516825766879428760/1516876170925314212
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%8F%97%EF%B8%8F%20-%20Designing/digital/bio-the-bao-i/2026-06/2026-06.json
- Archive source: https://discord.wafer.space/wafer-space/%F0%9F%93%90%20-%20Designing/%F0%9F%92%BB-digital/bio-the-bao-i/2026-06/2026-06.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1516825766879428760/1516864224931086456
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**Content**
```text
Thank you very much
Also I have noticed that
SRAM macro's LEF file shows SIZE 431.86 BY 484.88 but OpenROAD reports the placed instance as 863.72 Γ 969.76 Β΅m (exactly 2x).
Why could be that ?
```
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---