open-source-silicon #gf180mcu

tom@tom:~/repos/projects/openwave$ ngs pll tb_pfd
setup_tcp_xschem: problems listening to TCP port: 2021
couldn't open socket: address already in use


Note: Compatibility modes selected: hs a

Warning: m=xx on .subckt line will override multiplier m hierarchy!


Circuit: 

Error: unknown subckt: x1.xfiller_13_144.x0 vdd x1.xfiller_13_144.a_124_375# x1.xfiller_13_144.a_36_472# vdd x1.xfiller_13_144.pfet_06v0 <http://x1.xfiller_13_144.ad|x1.xfiller_13_144.ad>=1.0736p x1.xfiller_13_144.pd=6.64u <http://x1.xfiller_13_144.as|x1.xfiller_13_144.as>=0.5368p <http://x1.xfiller_13_144.ps|x1.xfiller_13_144.ps>=3.32u x1.xfiller_13_144.w=1.22u l=1u
    Simulation interrupted due to error!

Note: No ".plot", ".print", or ".fourier" lines; no simulations run

I have the following included in my top level spice dec but it still seems to be unable to find the 6v fets as far as i can tell

.include "/home/tom/repos/edalibs/pdks/gf180mcu/gf180mcuC/libs.tech/ngspice/design.ngspice"
.lib "/home/tom/repos/edalibs/pdks/gf180mcu/gf180mcuC/libs.tech/ngspice/sm141064.ngspice typical
.lib "/home/tom/repos/edalibs/pdks/gf180mcu/gf180mcuC/libs.tech/ngspice/smbb000149.ngspice typical"

Anyone have any ideas? Thanks in advance, Tom

pfd.spice

Tom

02/19/2023, 1:06 AM

Hi @Tim Edwards, the OSU standard cells in the gf180mcuC PDK I build following out conversation the other day have netlists which say they were extracted using magic (presumably at the time open_pdks was making the pdk) but the netlists call for FETs calles n/pmos_3p3, and I cannot find those in the libs.tech/ngspice folder. Do you kinow what is happening there?

James Stine

02/19/2023, 1:07 AM

@Landon Burleson can help you @Tom

Nelson Rodriguez

02/21/2023, 5:43 PM

One fast question, I want to check the cells made by professor @James Stine in GF180. To install this pdk I suppose have to follow the instructions here , if I run that, will I have problems with my current sky130 setup?

Philipp Gühring

02/24/2023, 7:41 AM

@Tim Edwards The DRC rule in magic for gf180mcuC: Diffusion contact width < 0.23um (CO.1 + 2 * CO.6) - I don't understand why we need 2 times CO.6 there, could you please explain?

Philipp Gühring

02/25/2023, 10:02 PM

@Tim Edwards gf180mcuC: M5.1 says 0.28um , KLayout DRC checks for 0.28um, but magic checks for 0.36um

Philipp Gühring

03/02/2023, 5:48 PM

The caravel frame for GF180 currently has a lot of labels on the GDS layers 21/10 and 204/10 for gf180mcuC, but those layers do not exist in the documentation. So I think we should either remove the layers from the Caravel design, or we should filter them out from the tapeout (perhaps the layers help during design), so that we deliver GDS as clean as possible to GF. Or does anyone need those layers to be present in the tapeout files?

Philipp Gühring

03/02/2023, 5:59 PM

I cannot find an implementation of the Antenna rules ANT.3, ANT.4, ANT.5 in the KLayout Antenna Violation DRC script. Are they intentionally missing?

James Stine

03/02/2023, 7:03 PM

We are getting errors from GF that indicate MT.2a indicating a top metal spacing of 0.46 however the gf180mcuC.tech has 0.36 in it - has anyone encountered this?

Jorge Marin

03/15/2023, 2:58 PM

hello all, is there a process stack figure available for the gf180mcu opensource process (I guess the stack depends on the options, no?)?

Amro Tork

03/15/2023, 4:19 PM

Yes @Jorge Marin

Amro Tork

03/15/2023, 4:19 PM

It does

Amro Tork

03/15/2023, 4:19 PM

But difference is not that big

Amro Tork

03/15/2023, 4:21 PM

https://opensource.googleblog.com/2022/08/GlobalFoundries-joins-Googles-open-source-silicon-initiative.html

Amro Tork

03/15/2023, 4:21 PM

And you could find the stack in the announcement

Jorge Marin

03/15/2023, 5:08 PM

Super, thanks a lot @Amro Tork

Guo Peichen

04/12/2023, 2:37 AM

Hello, all! Are we having an OpenMPW in March? Where can I get more information about it?

Xiaochen Ni

04/20/2023, 5:35 PM

@Xiaochen Ni has left the channel

Thomas Pluck

04/22/2023, 10:49 PM

Hi I'm having a hard time using MiM capacitors in GF180 - following the xschem tests given in

libs.tech

of gf180mcuC yields errors saying that the subcircuits that I can see in the file don't exist, even with some parameter tweaking. Does this have something to do with the new

sm141064_mim.ngspice

files or am i missing something obvious here? Thanks in advance for any help.

Juan Sebastian Moya

04/26/2023, 1:45 AM

Hi everyone, hope you are doing ok. I am trying to run a dc simulation for the nmos_3p3 device to check that the gf180mcuC has been installed ok. I had experience with sky130 and I tried to replicate the same script to get the Id vs Vds and Id vs Vgs nmos curves. However I have some issues with the model. Does any one knows the correct way to call the model in the simulation tb? I think the error is there. Follows the images of the schematic, the simulation tb and the error. Thanks in advance for any help.

黃彥允

04/26/2023, 7:51 AM

hello everyone, is there a recommended grid size for gf180 layout?

Vijayan Krishnan

05/08/2023, 7:46 AM

I am trying to setup yosys mapping files for ORFS flow similar to sky130hd https://github.com/The-OpenROAD-Project/OpenROAD-flow-scripts/blob/master/flow/platforms/sky130hd/cells_clkgate_hd.v. Can anyone confirm for gf180 is clock gate cell from this list https://gf180mcu-pdk.readthedocs.io/en/latest/digital/standard_cells/gf180mcu_fd_sc_mcu9t5v0/index.html?

👍 1

Vijayan Krishnan

05/16/2023, 10:26 AM

Other than default sram macros available pdks/gf180mcuC/libs.ref/gf180mcu_fd_ip_sram/
in OpenLane flow, how to generate other reuqired sram macros like

256x32

256x16

Tom

05/19/2023, 5:56 PM

Is there a standard cell library which uses the 3v3 fets? I know the OSU library does but it doesn't seem to have lib files for the cells. Alternatively how can I generate lib files? Is this something that magic can do? I am not familiar with the liberty files at all really

Tom

05/22/2023, 5:41 PM

Thank you @Michael Strothjohann, I will take a look at that if I decide to go down that route

Diego Fernando Almonacid Villalobos

05/24/2023, 6:30 PM

Hi everyone, I'm quite new to all of this, so my questions might be very basic. I want to work with the PDK #gf180mcu, so I copied the file gf180mcu.magicrc to the design folder, renamed it, and then opened Magic using the -rc command. It recognizes the technology and changes the default materials, but the names don't match those in the documentation (for example, poly2 or NCOMP). Is what I did correct? Is it normal for this to happen? I'm working with Harald Pretl's iic-osic-tools Docker.

Amro Tork

05/24/2023, 8:34 PM

@Diego Fernando Almonacid Villalobos Please use volare to install the pdk: https://github.com/efabless/volare

Tom

05/24/2023, 11:13 PM

Wait we're no longer supposed to use open_pdks?

Mitch Bailey

05/26/2023, 3:54 AM

Here are the current extra BE check results for gf180mcu-0. 31 designs with no errors detected!

Tom

05/28/2023, 3:29 AM

I'm getting a DRC error when instantiating the

gf180mcu_fd_sc_mcu9t5v0__dffrsnq_1

stdcell as follows which seems to be an error within the cell itself. I've tried all three modes for DRC checking in magic and when I run the DRC check in the layout window using

it reports no errors, however when I use the menu and ask it to

find next error

I get the following and I can't seem to make the red DRC notice next to the

Devices 2

button on the menu bar go green. Does anyone have any idea why?