---
page_id: wsd-33v-sram-9f9768f1
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title: "Thread: 3.3V SRAM"
slug: wsd-33v-sram-9f9768f1
route: /evidence/i-information/general/threads/33v-sram
section: reference
access: public
summary: 66 Discord messages from ℹ️ - Information/general/threads/33v-sram.md.
status: published
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---
# Thread: 3.3V SRAM
Category: **ℹ️ - Information**
Parent channel: **#general**
Thread ID: `1439805978022510703`
Messages: **66**
## message-1439876762057183283
**2025-11-17T07:16:11.691+00:00 — urish**
- Message ID: `1439876762057183283`
- Author ID: `732347216412278825`
- Nickname: urish
- User name: urish
- Type: `21`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1439876762057183283
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/33v-sram/2025-11/2025-11.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1361349523724570941/1439805978022510703
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```text
```
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---
## message-1439876776292651083
**2025-11-17T07:16:15.085+00:00 — urish**
- Message ID: `1439876776292651083`
- Author ID: `732347216412278825`
- Nickname: urish
- User name: urish
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1439876776292651083
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/33v-sram/2025-11/2025-11.json
**Content**
```text
Congrats Tim!
```
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---
## message-1439876884862079038
**2025-11-17T07:16:40.97+00:00 — urish**
- Message ID: `1439876884862079038`
- Author ID: `732347216412278825`
- Nickname: urish
- User name: urish
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1439876884862079038
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/33v-sram/2025-11/2025-11.json
**Content**
```text
How many bits?
300x300 will make it useful for TT projects
```
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---
## message-1439879938546073621
**2025-11-17T07:28:49.025+00:00 — tnt (@246tnt)**
- Message ID: `1439879938546073621`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1439879938546073621
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/33v-sram/2025-11/2025-11.json
**Content**
```text
512 bytes AFAIR
```
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---
## message-1439989030778441831
**2025-11-17T14:42:18.64+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1439989030778441831`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1439989030778441831
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/33v-sram/2025-11/2025-11.json
**Content**
```text
512 bytes was the largest of the four GF 5V SRAM macros. I was thinking of expanding that to 1kB for another macro; shouldn't be too hard. But I'll get this one done first.
```
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---
## message-1439994503833325719
**2025-11-17T15:04:03.518+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1439994503833325719`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1439994503833325719
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/33v-sram/2025-11/2025-11.json
**Content**
```text
@urish : What size is a TT slot on GF180MCU?
```
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---
## message-1439995008634720306
**2025-11-17T15:06:03.872+00:00 — tnt (@246tnt)**
- Message ID: `1439995008634720306`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1439995008634720306
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-11/2025-11.json
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**Content**
```text
346.64 um x 160.72 um
```
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---
## message-1439995222691156109
**2025-11-17T15:06:54.907+00:00 — urish**
- Message ID: `1439995222691156109`
- Author ID: `732347216412278825`
- Nickname: urish
- User name: urish
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1439995222691156109
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-11/2025-11.json
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**Content**
```text
https://github.com/TinyTapeout/tt-support-tools/blob/main/tech/gf180mcuD/tile_sizes.yaml
```
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---
## message-1439995373484769361
**2025-11-17T15:07:30.859+00:00 — tnt (@246tnt)**
- Message ID: `1439995373484769361`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1439995373484769361
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**Content**
```text
But that means in a 2x2 ( 711.20 um x 325.36 um ) you can fit a decent size SRAM and some logic.
```
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---
## message-1440117679569637457
**2025-11-17T23:13:30.902+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1440117679569637457`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1440117679569637457
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-11/2025-11.json
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**Content**
```text
The SRAM block is now both DRC and LVS clean. I will work tomorrow on squeezing out additional space at the bottom and then I will push to the repository. Again, don't expect timing values at this point in the process.
```
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## message-1440167035186188298
**2025-11-18T02:29:38.198+00:00 — Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1440167035186188298`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1440167035186188298
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@Tim Edwards - Super cool!
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## message-1440408122899300354
**2025-11-18T18:27:37.988+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1440408122899300354`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Edited: 2025-11-18T18:27:54.23+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1440408122899300354
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**Content**
```text
First commit of the 3.3V SRAM (512 bytes) is now *LIVE* at https://github.com/RTimothyEdwards/gf180mcu_ocd_ip_sram/ !
```
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---
## message-1440499556541399201
**2025-11-19T00:30:57.467+00:00 — Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1440499556541399201`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
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@Tim Edwards - Awesome work!
```
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---
## message-1440499591261720608
**2025-11-19T00:31:05.745+00:00 — Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1440499591261720608`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1440499591261720608
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```text
What's `ocd`?
```
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## message-1440514788282073148
**2025-11-19T01:31:28.997+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1440514788282073148`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
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```text
Open Circuit Design (or Obsessive-Compulsive Disorder; take your pick).
```
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---
## message-1440832611181133876
**2025-11-19T22:34:23.881+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1440832611181133876`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1440832611181133876
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**Content**
```text
Pushed an update today. I managed to squeeze some space out of it, but not as much as I originally thought I could; ultimately I recovered about 8um which is not terribly useful for having spent a full day and a half doing it. The final layout area is 301.3um x 321.89um. The fact that the height is now less than a TT slot height is purely coincidental, and probably meaningless. All digital pinouts are on the bottom side and there is only enough space in the TT slot to get maybe 9 routes in from the side, whereas the block has 36 digital I/O. It could be rotated 90 degrees but then the I/O are not in the preferred direction.
```
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---
## message-1440832935430328501
**2025-11-19T22:35:41.188+00:00 — Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1440832935430328501`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
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@Tim Edwards - How does that compare to the 5V SRAM?
```
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---
## message-1440866745907679253
**2025-11-20T00:50:02.234+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1440866745907679253`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
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```text
Area-wise, it's slightly less than 1/2 the area.
```
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---
## message-1440956079985922068
**2025-11-20T06:45:01.138+00:00 — tnt (@246tnt)**
- Message ID: `1440956079985922068`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1440956079985922068
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**Content**
```text
@Tim Edwards Well it would be easy enough to make a thin wrapper that brings the traces to the preferred routing direction ( and possibly adapts power rails so they connect nicely too ).
```
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---
## message-1441117105536635030
**2025-11-20T17:24:52.621+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1441117105536635030`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1441117105536635030
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**Content**
```text
I thought about that but didn't do a feasibility study. : ) Yet.
Also: It's pretty easy to make the smaller SRAM versions, since GF used the same control block exactly, just removed a number of rows and grounded the upper address bits. The 256 byte SRAM is 301.3um x 224.93um. It took me less than 30 minutes to create the 256 byte layout from the 512 byte layout, but there are a couple of LVS errors I need to fix. I should be able to get that pushed before the end of the weekend.
```
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---
## message-1441186999498309643
**2025-11-20T22:02:36.64+00:00 — Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1441186999498309643`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
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- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1441186999498309643
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:joke: Shouldn't it be 1/4th the size? 😛
```
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---
## message-1441192521756704798
**2025-11-20T22:24:33.249+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1441192521756704798`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
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**Content**
```text
The transistors scale to 1/4 area; everything else, not so much.
```
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---
## message-1441193118920740904
**2025-11-20T22:26:55.624+00:00 — Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1441193118920740904`
- Author ID: `169786952432746498`
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Yeah, sadly I knew that
```
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---
## message-1441561475050246255
**2025-11-21T22:50:38.569+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1441561475050246255`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
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**Content**
```text
I have pushed the 256 byte SRAM as well (now DRC and LVS clean).
```
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---
## message-1441713984662147134
**2025-11-22T08:56:39.694+00:00 — tnt (@246tnt)**
- Message ID: `1441713984662147134`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1441713984662147134
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**Content**
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@Tim Edwards Do you have a test slot planned for those ? Because I would love to have those validated in the first run, along with the split voltage IO lib since I'm planning to use those for the second tiny tapeout run ( and hopefully we'll have the results of the first run by then ).
```
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---
## message-1441807666019303495
**2025-11-22T15:08:55.07+00:00 — urish**
- Message ID: `1441807666019303495`
- Author ID: `732347216412278825`
- Nickname: urish
- User name: urish
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1441807666019303495
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**Content**
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Thought on putting them on TTGF0p2?
```
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---
## message-1441808131624669357
**2025-11-22T15:10:46.079+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1441808131624669357`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1441808131624669357
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/33v-sram/2025-11/2025-11.json
**Content**
```text
@tnt : That was my plan. I should be able to get something out in a week. It won't be a very complex chip but I should be able to put together a simple "openframe" version of Caravel-GF using the mixed-voltage pads and drop some SRAMs in the middle along with some basic control logic and call it a day.
```
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---
## message-1441808331848155230
**2025-11-22T15:11:33.816+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1441808331848155230`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1441808331848155230
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-11/2025-11.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/33v-sram/2025-11/2025-11.json
**Content**
```text
@urish : Maybe? What's the current support for 3.3V on TTGF?
```
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---
## message-1441809258768367656
**2025-11-22T15:15:14.811+00:00 — urish**
- Message ID: `1441809258768367656`
- Author ID: `732347216412278825`
- Nickname: urish
- User name: urish
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1441809258768367656
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-11/2025-11.json
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**Content**
```text
TTGF runs in 3v3 by default
```
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---
## message-1441809499911356587
**2025-11-22T15:16:12.304+00:00 — urish**
- Message ID: `1441809499911356587`
- Author ID: `732347216412278825`
- Nickname: urish
- User name: urish
- Type: `Default`
- Edited: 2025-11-22T15:16:20.498+00:00
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1441809499911356587
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-11/2025-11.json
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**Content**
```text
The main question is if we feel confident enough to put it since designs aren't power gated
```
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---
## message-1441810030314651668
**2025-11-22T15:18:18.762+00:00 — tnt (@246tnt)**
- Message ID: `1441810030314651668`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1441810030314651668
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**Content**
```text
@urish Well not really because there aren't power gates and I'd like to run comparison between 3.3v and 5v which means everything on there must support 5V without destroying the chip ...
```
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---
## message-1441811273053503519
**2025-11-22T15:23:15.054+00:00 — urish**
- Message ID: `1441811273053503519`
- Author ID: `732347216412278825`
- Nickname: urish
- User name: urish
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1441811273053503519
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**Content**
```text
And I guess the SRAM isn't 5v tolerant?
```
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---
## message-1441811783756284056
**2025-11-22T15:25:16.815+00:00 — tnt (@246tnt)**
- Message ID: `1441811783756284056`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1441811783756284056
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**Content**
```text
Well ... it's in the title, it's a 3.3V SRAM with all the transistors resized from 5V to 3.3V 😅
```
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---
## message-1441811924072534139
**2025-11-22T15:25:50.269+00:00 — tnt (@246tnt)**
- Message ID: `1441811924072534139`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1441811924072534139
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**Content**
```text
I mean weather it would burst in flames at 5V ... probably not tbh.
```
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## message-1441812859461046353
**2025-11-22T15:29:33.283+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1441812859461046353`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1441812859461046353
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**Content**
```text
I don't know the breakdown voltage for 3.3V transistors offhand.
```
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---
## message-1441814815936090162
**2025-11-22T15:37:19.743+00:00 — tnt (@246tnt)**
- Message ID: `1441814815936090162`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1441814815936090162
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**Content**
```text
Punch-Through Voltage in the spec is 6.5V min
```
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## message-1441814891710382110
**2025-11-22T15:37:37.809+00:00 — tnt (@246tnt)**
- Message ID: `1441814891710382110`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1441814891710382110
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**Content**
```text
(from https://gf180mcu-pdk.readthedocs.io/en/latest/analog/spice/elec_specs/elec_specs_1.html )
```
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---
## message-1441830722259390614
**2025-11-22T16:40:32.106+00:00 — urish**
- Message ID: `1441830722259390614`
- Author ID: `732347216412278825`
- Nickname: urish
- User name: urish
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1441830722259390614
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-11/2025-11.json
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**Content**
```text
So should be fine then?
```
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---
## message-1441833655143239690
**2025-11-22T16:52:11.36+00:00 — tnt (@246tnt)**
- Message ID: `1441833655143239690`
- Author ID: `596068704471482370`
- Nickname: tnt
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- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1441833655143239690
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**Content**
```text
I guess so, to some extent ...
```
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## message-1441845326376992911
**2025-11-22T17:38:33.999+00:00 — urish**
- Message ID: `1441845326376992911`
- Author ID: `732347216412278825`
- Nickname: urish
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- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1441845326376992911
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**Content**
```text
It's your call
```
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---
## message-1442294819304243221
**2025-11-23T23:24:41.464+00:00 — Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1442294819304243221`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1442294819304243221
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**Content**
```text
Two thoughts:
* I have offered Tim Edwards a slot...
* I'm open to Tiny Tapeout using multiple slots, there should be some spare.
```
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---
## message-1442384769135546400
**2025-11-24T05:22:07.175+00:00 — urish**
- Message ID: `1442384769135546400`
- Author ID: `732347216412278825`
- Nickname: urish
- User name: urish
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1442384769135546400
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**Content**
```text
Thanks Tim!
```
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---
## message-1442384825917902899
**2025-11-24T05:22:20.713+00:00 — urish**
- Message ID: `1442384825917902899`
- Author ID: `732347216412278825`
- Nickname: urish
- User name: urish
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1442384825917902899
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**Content**
```text
Re using multiple slots - that's up to Sylvain
```
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---
## message-1444751452412317899
**2025-11-30T18:06:28.439+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1444751452412317899`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1444751452412317899
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**Content**
```text
Currently working through DRC errors as seen by klayout on the SRAM blocks. It's a bit tedious but no major issues.
```
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---
## message-1445486435959570504
**2025-12-02T18:47:02.172+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1445486435959570504`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1445486435959570504
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/33v-sram/2025-12/2025-12.json
**Content**
```text
I have finished both SRAMs (256 byte and 512 byte), all completely DRC clean with respect to both magic and klayout, and LVS verified with magic and netgen.
```
**Reactions**
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---
## message-1445536976991162451
**2025-12-02T22:07:52.093+00:00 — tnt (@246tnt)**
- Message ID: `1445536976991162451`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1445536976991162451
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/33v-sram/2025-12/2025-12.json
**Content**
```text
Do you have them in a test chip though ? 😅
```
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---
## message-1445582996638797937
**2025-12-03T01:10:44.032+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1445582996638797937`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Reply`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1445582996638797937
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/33v-sram/2025-12/2025-12.json
**Reply/reference**
- https://discord.com/channels/1361349522684510449/1439805978022510703/1445536976991162451
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**Content**
```text
Working on it. I have the picoRV32 openframe project from sky130, and porting it isn't too hard. Getting it synthesized and verified in one day. . . That might be tough (although the sky130 version was synthesized and manufactured, so the configuration files exist). Worst case---I'll just drop a couple of SRAM modules directly into a user project and wire up the I/O by hand.
```
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---
## message-1445600205776093254
**2025-12-03T02:19:07.01+00:00 — Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1445600205776093254`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1445600205776093254
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/33v-sram/2025-12/2025-12.json
**Content**
```text
@Tim Edwards - I think we have a bunch of empty 0.5x1 and 1x0.5 slots - it would be great to just have a bunch of SRAM connected to I/O there...
```
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---
## message-1445600288781369487
**2025-12-03T02:19:26.8+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1445600288781369487`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1445600288781369487
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/33v-sram/2025-12/2025-12.json
**Content**
```text
Does anybody happen to know if the `CEN` input to the SRAMs (this applies to the 5V SRAMs as well) is supposed to be always high after reset? Based on some other implementation of Caravel (which was probably for SkyWater), I have `CEN` toggling with the `valid` signal on the wishbone bus. I'm not sure if the SRAM is supposed to be operated that way.
```
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---
## message-1445600466045239449
**2025-12-03T02:20:09.063+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1445600466045239449`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1445600466045239449
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-12/2025-12.json
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**Content**
```text
@Tim 'mithro' Ansell : I'd have to prepare a 0.5 x 1 mm padframe, though. How much time are you willing to give me to do that?
```
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---
## message-1445600494348271738
**2025-12-03T02:20:15.811+00:00 — Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1445600494348271738`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1445600494348271738
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-12/2025-12.json
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**Content**
```text
There was some discussion around it being confusingly name -- I think it was It's CE_N, not C_EN
```
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---
## message-1445600633758421104
**2025-12-03T02:20:49.049+00:00 — Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1445600633758421104`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1445600633758421104
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/33v-sram/2025-12/2025-12.json
**Content**
```text
@Tim Edwards - I ***believe*** @Leo Moser (mole99) has/had some prepare padframe for those layouts?
```
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---
## message-1445600995781513267
**2025-12-03T02:22:15.362+00:00 — Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1445600995781513267`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1445600995781513267
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-12/2025-12.json
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**Content**
```text
Or do you have custom I/Os too?
```
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---
## message-1445601036155748352
**2025-12-03T02:22:24.988+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1445601036155748352`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1445601036155748352
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**Content**
```text
@Tim 'mithro' Ansell : I admit that I have not looked at the tapeout deadline specifics. What is the last time to get something in?
```
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---
## message-1445601220084633671
**2025-12-03T02:23:08.84+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1445601220084633671`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1445601220084633671
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/33v-sram/2025-12/2025-12.json
**Content**
```text
@Tim 'mithro' Ansell : Yes, I have custom I/Os, although in principle the 5V I/Os also work at 3.3V and could be used to test the SRAM.
```
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---
## message-1445601296110588097
**2025-12-03T02:23:26.966+00:00 — Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1445601296110588097`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1445601296110588097
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**Content**
```text
Current @
```
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---
## message-1445601460589953139
**2025-12-03T02:24:06.181+00:00 — Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1445601460589953139`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
- User name: mithro_
- Type: `Default`
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**Content**
```text
I'm still waiting for some information from GF which might affect that
```
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---
## message-1445601669445582969
**2025-12-03T02:24:55.976+00:00 — Tim 'mithro' Ansell (@mithro_)**
- Message ID: `1445601669445582969`
- Author ID: `169786952432746498`
- Nickname: Tim 'mithro' Ansell
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**Content**
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https://www.timeanddate.com/worldclock/fixedtime.html?iso=20251203T2359&p1=3399
```
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---
## message-1445601960618365029
**2025-12-03T02:26:05.397+00:00 — Tim 'mithro' Ansell (@mithro_)**
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- Author ID: `169786952432746498`
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- User name: mithro_
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1445601960618365029
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-12/2025-12.json
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**Reply/reference**
- https://discord.com/channels/1361349522684510449/1423348662318272592/1445536455626592379
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```text
```
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---
## message-1445677658058002504
**2025-12-03T07:26:53.073+00:00 — Leo Moser (mole99) (@mole99)**
- Message ID: `1445677658058002504`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1445677658058002504
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/33v-sram/2025-12/2025-12.json
**Content**
```text
The area and padring definitions for the slots are in: https://github.com/wafer-space/gf180mcu-project-template/tree/main/librelane/slots
The CI builds a chip with all four different slot sizes, so you can grab a GDS from the Artifacts section at the very bottom: https://github.com/wafer-space/gf180mcu-project-template/actions/runs/19820104811
```
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---
## message-1445678319927558199
**2025-12-03T07:29:30.875+00:00 — Leo Moser (mole99) (@mole99)**
- Message ID: `1445678319927558199`
- Author ID: `323371864074485771`
- Nickname: Leo Moser (mole99)
- User name: mole99
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1445678319927558199
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-12/2025-12.json
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**Content**
```text
@Tim Edwards, have you run the precheck on your design yet?
You can do so via the online platform: https://platform.wafer.space
Or, if that doesn't work, you can pass it to me and I can run the precheck locally for you.
```
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---
## message-1448789129184935936
**2025-12-11T21:30:45.598+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1448789129184935936`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1448789129184935936
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/33v-sram/2025-12/2025-12.json
**Content**
```text
Surprisingly, I found out today that there is an "A[9]" line in the GF SRAM block, and it's connected to row decode circuitry, so at least logically, it's possible to extend the 512 byte SRAM to 1024 bytes. So I did, and added the block to my test chip. It's possible that there's a _reason_ that GF didn't have a 1024k macro for their 5V SRAM, and just tied off the A[9] line internally. But worth finding out!
```
**Reactions**
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---
## message-1448789900160798870
**2025-12-11T21:33:49.413+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1448789900160798870`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1448789900160798870
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/33v-sram/2025-12/2025-12.json
**Content**
```text
Also, since my SRAM test chip was failing antenna checks, I took the opportunity to add antenna tie-downs on all the input pins of the 3.3V SRAM macros that were connected only to FET gates internally. I'm running the antenna check on the result now; hopefully that prevents many future issues with the SRAM blocks. Should try to do the same to the 5V SRAMs. There's plenty of room right at the bottom to place a contact and a small piece of diffusion under each input line except for the address lines, and the address lines are going through some transmission gate so they're already connected to diffusion and don't need the antenna diode.
```
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---
## message-1448803185522376725
**2025-12-11T22:26:36.89+00:00 — tnt (@246tnt)**
- Message ID: `1448803185522376725`
- Author ID: `596068704471482370`
- Nickname: tnt
- User name: 246tnt
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1448803185522376725
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-12/2025-12.json
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**Content**
```text
I'm wondering, did you draw a schematic / architecure for the SRAM ?
```
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---
## message-1448811693747601538
**2025-12-11T23:00:25.409+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1448811693747601538`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1448811693747601538
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/33v-sram/2025-12/2025-12.json
**Content**
```text
No, that's on my to-do list. I don't think I will be able to create a valid netlist for the 1kB SRAM without a schematic, though. The existing netlists were generated with Calibre and are not schematic captured (and are, frankly, a big mess), so it needs doing and will get done when I get around to it. For now I'm depending on the simplicity of converting the 512 byte layout to 1kB to be able to eyeball the LVS, but I hope to get proper LVS done before the Wafer.Space tapeout deadline passes.
```
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---
## message-1450638641461334177
**2025-12-17T00:00:03.687+00:00 — Tim Edwards (@rtimothyedwards_19428)**
- Message ID: `1450638641461334177`
- Author ID: `1365118310701600900`
- Nickname: Tim Edwards
- User name: rtimothyedwards_19428
- Type: `Default`
- Discord message: https://discord.com/channels/1361349522684510449/1439805978022510703/1450638641461334177
- Archive source: https://discord.wafer.space/wafer-space/%E2%84%B9%EF%B8%8F%20-%20Information/general/33v-sram/2025-12/2025-12.json
- Archive source: https://discord.wafer.space/wafer-space/Voice%20Channels/general/33v-sram/2025-12/2025-12.json
**Content**
```text
@tnt : Today's update to the repository: Complete schematics for all three SRAM blocks.
```
**Reactions**
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---