| 1 Apr 2021 |
 Nguyen.Dao | In reply to@_slack_skywater-pdk_U01GE4F371D:matrix.org
Could we produce a 2x2 clb gds and then stitch together to make a bigger fabric? Running time are almost same: 12s (1x2 clbs) and 13s (2x2 clbs) | 13:05:49 |
 Rob Taylor | In reply to@_slack_skywater-pdk_U01L8BR7FFA:matrix.org
Running time are almost same: 12s (1x2 clbs) and 13s (2x2 clbs) Interesting. Same for 3x3? | 13:06:55 |
| Rob Taylor | In reply to@_slack_skywater-pdk_U01GE4F371D:matrix.org
Interesting. Same for 3x3? I wonder - are you hitting memory limits and it’s going into swap? | 13:07:14 |
| Nguyen.Dao | In reply to@_slack_skywater-pdk_U01GE4F371D:matrix.org
I wonder - are you hitting memory limits and it’s going into swap? I haven’t tried 3x3, need to ask Jing to generate codes. I don’t think memory is limited, it used only 1% of memory (64GB) when routing | 13:09:05 |
| Rob Taylor | In reply to@_slack_skywater-pdk_U01L8BR7FFA:matrix.org
I haven’t tried 3x3, need to ask Jing to generate codes. I don’t think memory is limited, it used only 1% of memory (64GB) when routing Same when going the 4x4? | 13:09:57 |
| Nguyen.Dao | In reply to@_slack_skywater-pdk_U01GE4F371D:matrix.org
Same when going the 4x4? yes, same memory at 1% | 13:10:19 |
| Rob Taylor | In reply to@_slack_skywater-pdk_U01L8BR7FFA:matrix.org
yes, same memory at 1% Very odd. Ok let’s get a 3x3 tested, find out where this breaks and then let’s submit a bug | 13:11:16 |
| Rob Taylor | In reply to@_slack_skywater-pdk_U01GE4F371D:matrix.org
Very odd. Ok let’s get a 3x3 tested, find out where this breaks and then let’s submit a bug Or maybe 2x4 if that’s easier | 13:13:29 |
| Nguyen.Dao | In reply to@_slack_skywater-pdk_U01GE4F371D:matrix.org
Or maybe 2x4 if that’s easier it’s OK with 2x4, global routing took 16s, looks like the running time doesn’t go exponentially | 15:30:51 |
| Rob Taylor | In reply to@_slack_skywater-pdk_U01L8BR7FFA:matrix.org
it’s OK with 2x4, global routing took 16s, looks like the running time doesn’t go exponentially Weird! | 15:33:59 |
| Rob Taylor | In reply to@_slack_skywater-pdk_U01GE4F371D:matrix.org
Weird! Ok, it’d be good to prepare a test case that shows the working version and the non working version and submit that as a bug against openlane | 15:34:36 |
 _slack_skywater-pdk_U016ELL4X4M | [efabless/openlane] Issue opened by nguyendao-uom | 16:48:29 |
|  Nayiri joined the room. | 21:08:28 |
| 2 Apr 2021 |
 Mitch Bailey | How is openlane related to openroad? Is openlane a wrapper to the openroad flow or an enhancement? | 06:44:21 |
| Rob Taylor | Mitch Bailey openlane uses openroad | 07:13:01 |
| Rob Taylor | interesting project here for anyone into HLS - https://github.com/google/xls/issues/370 | 07:13:21 |
 Amro Tork | In reply to@_slack_skywater-pdk_U017X0NM2E7:matrix.org
How is openlane related to openroad? Is openlane a wrapper to the openroad flow or an enhancement? Openlane encompasses several tools including OpenRoad. It's an entire flow from RTL till GDS. | 11:20:09 |
 Iztok Jeras | Hi, I would like to run some spice simulations of a digital netlist.
I went through README.md and built a digital block.
I created a spice simulation included the netlist, wrote stimuli, but I have trouble with cell and transistor libraries. | 19:34:06 |
| Iztok Jeras | for cell libraries I used:
OPENLANE_ROOT/pdks/sky130A/libs.ref/sky130_fd_sc_hd/spice/sky130_fd_sc_hd.spice
if included before the netlist, then cell blackboxes from the netlist are ignored
now I have trouble finding a proper set of primitive (transistor, ...) libraries | 19:36:58 |
| Iztok Jeras | I experimented a bit with libraries from some other projects I found online, but they are incomplete (mising _lvt, _hvt parts). | 19:38:12 |
| Iztok Jeras | What would be the preferred option to create a proper spice library? Preferably one where I can select the desired corner. | 19:39:58 |
| 3 Apr 2021 |
|  David Murphy joined the room. | 03:20:37 |
| Iztok Jeras | I think I got all the components I needed:
additional components from OPENLANE not part of the PDK
.INCLUDE ../../../pdks/open_pdks/sky130/custom/models/short.spice
.INCLUDE ../../../pdks/open_pdks/sky130/custom/models/diode.spice
library of primitives from https://github.com/google/skywater-pdk.git
.LIB ../../../../skywater-pdk/libraries/sky130_fd_pr/latest/models/sky130.lib.spice tt
* include Skywater 130nm cell libraries
.INCLUDE ../../../pdks/sky130A/libs.ref/sky130_fd_sc_hd/spice/sky130_fd_sc_hd.spice | 10:33:10 |
|  shbo changed their display name from Shubho to shbo. | 15:15:10 |
| 4 Apr 2021 |
| Iztok Jeras | Is there a way to get a Standard Delay Format (SDF) file for the synthesis or a later stage verilog netlist? | 11:42:38 |
| 5 Apr 2021 |
 Matt Liberty | Iztok Jeras opensta has a write_sdf command you could try from openroad | 03:04:54 |
|  Matthew Guthaus joined the room. | 16:59:24 |
| Matthew Guthaus | If I set STD_CELL_LIBRARY and re-run "make pdk", it seems that flow.tcl still doesn't get the new library. I'm doing this like:
export STD_CELL_LIBRARY="sky130_fd_sc_ls"
make pdk
make mount
echo $STD_CELL_LIBRARY (not set, so I set it again)
export STD_CELL_LIBRARY="sky130_fd_sc_ls"
./flow.tcl -design spm
...
INFO]: Extracting the number of available metal layers from /home/mrg/openlane/pdks/sky130A/libs.ref/sky130_fd_sc_hd/techlef/sky130_fd_sc_hd.tlef
[ERROR]: during executing: "python3 /openLANE_flow/scripts/extract_metal_layers.py -t /home/mrg/openlane/pdks/sky130A/libs.ref/sky130_fd_sc_hd/techlef/sky130_fd_sc_hd.tlef -o /openLANE_flow/designs/spm/runs/05-04_16-57/tmp/met_layers_list.txt"
[ERROR]: Exit code: 1
[ERROR]: Last 10 lines:
Traceback (most recent call last):
File "/openLANE_flow/scripts/extract_metal_layers.py", line 37, in module
with open(techlef_name, "r") as f:
FileNotFoundError: [Errno 2] No such file or directory: '/home/mrg/openlane/pdks/sky130A/libs.ref/sky130_fd_sc_hd/techlef/sky130_fd_sc_hd.tlef' | 17:01:20 |
| Matthew Guthaus | (make test also fails) | 17:02:06 |
| Matthew Guthaus | It looks like this configuration configuration/general.tcl overwrites the library no matter what:
set ::env(STD_CELL_LIBRARY) "sky130_fd_sc_hd" | 18:26:54 |
