stefanschippers/xschem_sky130

XSCHEM symbol libraries for the Google-Skywater 130nm process design kit.

xschem_sky130's Issues

test_inv.sch references $::SKYWATER_MODEL but when you run a NGSPICE simulation it does not exist

For some reason, the variable here errors out. Version: e34045b

Screenshot:

Code:

xschem_sky130/sky130_tests/test_inv.sch

Line 117 in e34045b

.lib $::SKYWATER_MODELS/sky130.lib.spice tt

Directions to import other librariers (spice or verilog)

I see there are some import scripts (verilog,spice) in the folders, but a set of directions to import other libraries will be helpful.
Kindly point to specific files in case I missed the same. Is it possible to show the import process of the SKY130 itself and hooks to modify import parameters (in a video)?
Edit: I do see the example for spice import for the hash (https://github.com/StefanSchippers/xschem_sky130/tree/main/decred_hash_macro) Let me know if this is the the template to be followed

Underlying transistor-based schematics of sky130_stdcells

Hi @StefanSchippers ,

Regarding the xschem symbols provided for the sky130_fd_sc_hd standard cell library, is there a means by which someone can see a symbol's underlying transistor-based schematic?

Thank you!

is there an example of a circuit, ready for layout?

in the top.sch are links to a few examples. but i think the only one that had some ESD-protection was the buck-converter, and that didnt had any bonding-pads and also no ESD-protection-diodes, only MOSFETs.

is there some example available using some analog and some digital IOs with all the necessary protection and bonding pads?

ngspice run error

Hi Stefan ,

Based on your video tutorial , i have installed xschem and ngspice with sky 130.
Also applied the patch as shown in the video.

patching file cells/pfet_01v8_mvt/sky130_fd_pr__pfet_01v8_mvt.pm3.spice
patching file cells/pfet_g5v0d10v5/sky130_fd_pr__pfet_g5v0d10v5__ff.pm3.spice
patching file cells/pfet_g5v0d10v5/sky130_fd_pr__pfet_g5v0d10v5__fs.pm3.spice
patching file cells/pfet_g5v0d10v5/sky130_fd_pr__pfet_g5v0d10v5__leak.pm3.spice
patching file cells/pfet_g5v0d10v5/sky130_fd_pr__pfet_g5v0d10v5.pm3.spice
patching file cells/pfet_g5v0d10v5/sky130_fd_pr__pfet_g5v0d10v5__sf.pm3.spice
patching file cells/pfet_g5v0d10v5/sky130_fd_pr__pfet_g5v0d10v5__ss.pm3.spice
patching file cells/pfet_g5v0d10v5/sky130_fd_pr__pfet_g5v0d10v5__tt_leak.pm3.spice
patching file cells/pfet_g5v0d10v5/sky130_fd_pr__pfet_g5v0d10v5__tt.pm3.spice
patching file cells/pfet_g5v0d16v0/sky130_fd_pr__pfet_g5v0d16v0.pm3.spice
patching file cells/pfet_g5v0d16v0/sky130_fd_pr__pfet_g5v0d16v0__subcircuit.pm3.spice
patching file models/r+c.mrp1monte.spice

But still getting error while running ngspice :

sky130_fd_pr__nfet_g5v0d10v5__kvth0_diff} lkvth0={0+sky130_fd_pr__nfet_g5v0d10v5__lkvth0_diff} wkvth0={0+sky130_fd_pr__nfet_g5v0d10v5__wkvth0_diff} pkvth0=0.0 llodvth=0.0 wlodvth=1.0 stk2=0.0 lodk2=1.0 lodeta0=1.0 ku0={0+sky130_fd_pr__nfet_g5v0d10v5__ku0_diff} lku0={0+sky130_fd_pr__nfet_g5v0d10v5__lku0_diff} wku0={0+sky130_fd_pr__nfet_g5v0d10v5__wku0_diff} pku0=0.0 llodku0=0.0 wlodku0=1.0 kvsat={0+sky130_fd_pr__nfet_g5v0d10v5__kvsat_diff} steta0=0.0 tku0=0.0
Original line no.: 0, new internal line no.: 16543:
Cannot compute substitute
Original line no.: 0, new internal line no.: 16544:
Undefined number [w]
Original line no.: 0, new internal line no.: 16544:
Expression err: lwmult)))} dtox=0.0 ndep=1.7000000000000000e+17 nsd=1.0e+20 rshg=0.1 rsh=1.0 vth0={0.789731232828288+sky130_fd_pr__nfet_g5v0d10v5__vth0_slope_spectre*(sky130_fd_pr__nfet_g5v0d10v5__vth0_slope/sqrt(lwmult))} lvth0=2.9729

Thanks

.xschemrc is not present after installing skywater

Installation of magic and skywater pdk

I was watching your video to install magic and skywater pdk, but the links were not the same in open_pdks
I installed magic and then skywater pdk as described withe ./configure and make
Got this error with make install. Can you please help with this
cp: cannot create regular file '/usr/local/bin/magic': Permission denied
make[2]: *** [Makefile:87: /usr/local/bin/magic.sh] Error 1
make[2]: Leaving directory '/home/prabha/projects/foundry/skywater-pdk/magic/tcltk'
make[1]: *** [Makefile:94: install-tcl-real] Error 2
make[1]: Leaving directory '/home/prabha/projects/foundry/skywater-pdk/magic'
make: *** [Makefile:91: install-tcl] Error 2
prabha@DESKTOP-E32V3A5:~/projects/foundry/skywater-pdk/magic$

Error running xshem from xschem_sky130 directory

Hi Stefan,

I am seeing following error while running xschem from xschem_sky130 direction
my directory has following files

Output error is

Thanks and regards,
Abhishek

Can't find sky130_fd_sc_hd.spice

Hi Stefan,
I can't find sky130_fd_sc_hd.spice in my sky-water folder. Does this file exist after installation or do we need to write it ourselves?

issue in xschem and Ngspice using sky130 process

i have an issue when try to simulate the Reram-tb utilizing xscehm and ngspice. i encounter the following error when trying to simulate the reram and check the waveform uisng ngspice: % l_s_d(): Symbol not found: /home/schippes/share/xschem/xschem_library/devices/vsource.sym
l_s_d(): Symbol not found: /home/schippes/share/xschem/xschem_library/devices/vsource.sym
Hoever, the library for the reram is installed with other sky130 libraries in my local directory not the path given in the error message.

when I press on the voltage source and edit the path for vsource to be my local directory for vsource I got the following error:

Circuit: ** sch_path: /home/eda_work/eman/hassan/open_pdks/sources/xschem_sky130/sky130_tests/tb_reram.sch

Error on line 3 or its substitute:
n1 top 0 sky130_fd_pr_reram__reram_model
unknown device type - error
The simulation interrupted due to an error!

Also, when cant get the Netlist for the design when I press the Create Netlist button?!.

I am totally new to this technology and I would appreciate your help.
Thank you.

Resistor models contain an error. Fix provided.

Schematic:

If I try to run it this happens.

NGSPICE Log:

ngspice -r "serdes/resisor_issue.raw" serdes/resisor_issue.spice
******
** ngspice-34 : Circuit level simulation program
** The U. C. Berkeley CAD Group
** Copyright 1985-1994, Regents of the University of California.
** Copyright 2001-2020, The ngspice team.
** Please get your ngspice manual from http://ngspice.sourceforge.net/docs.html
** Please file your bug-reports at http://ngspice.sourceforge.net/bugrep.html
** Creation Date: Sat Mar  6 03:53:35 UTC 2021
******

Compatibility modes selected: hs a


Circuit: **.subckt resisor_issue

Error: unknown subckt: xr1 0 net1 sky130_fd_pr__res_generic_m1 w=1 l=1 mult=1 m=1
    Simulation interrupted due to error!

ngspice 1 -> 

Netlist (my install path is /opt/pdk_root, other models like transistors work):

**.subckt resisor_issue
V2 net1 GND vdd_volts
XR1 GND net1 sky130_fd_pr__res_generic_m1 W=1 L=1 mult=1 m=1
**** begin user architecture code

.temp 125
.param vdd_volts=1.65
.param vddio_volts=3.0


.control
tran 0.01ns 20ns
write
.endc


.param mc_mm_switch=0


.lib "/opt/pdk_root/sky130A/libs.tech/ngspice/sky130.lib.spice" ss


**** end user architecture code
**.ends
.GLOBAL GND
** flattened .save nodes
.end

1. The spiceprefix by default has to be R instead of X. After fixing, it complains that mult parameter does not exist in the model
2. I modified the symbol file to remove mult parameter and set the spiceprefix to R by default and now it works. See diff below, this change might need to be applied to other models.

diff res_generic_m1.sym /opt/pdk_root/open_pdks/sources/xschem_sky130/sky130_fd_pr/res_generic_m1.sym 
20c20
< format="@spiceprefix@name @pinlist sky130_fd_pr__@model W=@W L=@L m=@mult"
---
> format="@spiceprefix@name @pinlist sky130_fd_pr__@model W=@W L=@L mult=@mult m=@mult"
25c25
< spiceprefix=R
---
> spiceprefix=X

UPD: I verified that m= parameter works.

See: RTimothyEdwards/open_pdks#159

Simulating sky130_stdcells in xschem & ngspice

Hi @StefanSchippers ,

Regarding the use of sky13_fd_sc_hd standard cell library components in xschem and running ngspice, how do we setup ngspice to find the corresponding subckt definitions?

Upon trying both TT_MODELS and Corner: tt packages from the xschemrc file, I receive "unknown subckt errors".

Thank you!

./bin/xschem not working while running from xschem_sky130 directory

Hi Stefan,

I am unable to run xschem using './bin/xschem' from sky_130 directory.

Thanks and regards,
Abhishek

patch problem for sky130 in xschem

Hi, I was trying to run the patch command but getting this below error .
I already have openalne install in my system , so i was using this patch command in my openlane directory where pdks are install.
Can you please let me know how to solve this issue ?

atch -p2 < /home/embedded/.xschem/xschem_library/xschem_sky130/sky130_fd_pr.patch
can't find file to patch at input line 4
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:

|diff -Naur sky130_fd_pr/latest/cells/nfet_01v8/sky130_fd_pr__nfet_01v8__ff.pm3.spice sky130_fd_pr_ngspice/latest/cells/nfet_01v8/sky130_fd_pr__nfet_01v8__ff.pm3.spice
|--- sky130_fd_pr/latest/cells/nfet_01v8/sky130_fd_pr__nfet_01v8__ff.pm3.spice 2020-11-08 01:33:06.385642949 +0100
|+++ sky130_fd_pr_ngspice/latest/cells/nfet_01v8/sky130_fd_pr__nfet_01v8__ff.pm3.spice 2020-12-08 04:28:01.986577051 +0100

File to patch: