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skywater-pdk: openlane

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1 Apr 2021
@_slack_skywater-pdk_U01SMK92GH4:matrix.orgSukanta Dey changed their profile picture.04:32:18
@_slack_skywater-pdk_U016HSA1H5Y:matrix.orgOlof Kindgren
In reply to@_slack_skywater-pdk_U01GE4F371D:matrix.org
mkk ^
Rob Taylor Actually had a talk with Ahmed Ghazy and Mohamed Shalan yesterday about Edalize, OpenLane and cloud use-cases
06:26:38
@_slack_skywater-pdk_U01GE4F371D:matrix.orgRob Taylor
In reply to@_slack_skywater-pdk_U0169AQ41L6:matrix.org
I have access through Tim/Openroad and it is definitely helpful. But I still feel I am not using the gcp to its full potential. Do you have access to gcp? Maybe you could help me enhance my scripts 😉
sure, would be happy to see if i can help
08:42:51
@_slack_skywater-pdk_U01GE4F371D:matrix.orgRob Taylor
In reply to@_slack_skywater-pdk_U016HSA1H5Y:matrix.org
Rob Taylor Actually had a talk with Ahmed Ghazy and Mohamed Shalan yesterday about Edalize, OpenLane and cloud use-cases
nice :)
08:43:09
@_slack_skywater-pdk_U01L8BR7FFA:matrix.orgNguyen.Dao
In reply to@_slack_skywater-pdk_U01GE4F371D:matrix.org
nice :)
Update: the flow works fine with 1x2 and 2x2 CLBs fabrics without timing optimization (OpenPhySyn doesn’t support disable timing loops). For the 4x4 CLBs fabric, it’s stuck at global routing (fastroute)?
12:54:10
@_slack_skywater-pdk_U01SRAD8APP:matrix.orgJamey Hicks joined the room.13:00:27
@_slack_skywater-pdk_U01GE4F371D:matrix.orgRob Taylor
In reply to@_slack_skywater-pdk_U01L8BR7FFA:matrix.org
Update: the flow works fine with 1x2 and 2x2 CLBs fabrics without timing optimization (OpenPhySyn doesn’t support disable timing loops). For the 4x4 CLBs fabric, it’s stuck at global routing (fastroute)?
Does the time go up exponentially?
13:00:55
@_slack_skywater-pdk_U01GE4F371D:matrix.orgRob Taylor
In reply to@_slack_skywater-pdk_U01GE4F371D:matrix.org
Does the time go up exponentially?
Could we produce a 2x2 clb gds and then stitch together to make a bigger fabric?
13:00:56
@_slack_skywater-pdk_U01L8BR7FFA:matrix.orgNguyen.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
@_slack_skywater-pdk_U01GE4F371D:matrix.orgRob 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
@_slack_skywater-pdk_U01GE4F371D:matrix.orgRob 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
@_slack_skywater-pdk_U01L8BR7FFA:matrix.orgNguyen.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
@_slack_skywater-pdk_U01GE4F371D:matrix.orgRob 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
@_slack_skywater-pdk_U01L8BR7FFA:matrix.orgNguyen.Dao
In reply to@_slack_skywater-pdk_U01GE4F371D:matrix.org
Same when going the 4x4?
yes, same memory at 1%
13:10:19
@_slack_skywater-pdk_U01GE4F371D:matrix.orgRob 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
@_slack_skywater-pdk_U01GE4F371D:matrix.orgRob 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
@_slack_skywater-pdk_U01L8BR7FFA:matrix.orgNguyen.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
@_slack_skywater-pdk_U01GE4F371D:matrix.orgRob 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
@_slack_skywater-pdk_U01GE4F371D:matrix.orgRob 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:matrix.org_slack_skywater-pdk_U016ELL4X4M [efabless/openlane] Issue opened by nguyendao-uom 16:48:29
@_slack_skywater-pdk_U0199HJPH46:matrix.orgNayiri joined the room.21:08:28
2 Apr 2021
@_slack_skywater-pdk_U017X0NM2E7:matrix.orgMitch Bailey How is openlane related to openroad? Is openlane a wrapper to the openroad flow or an enhancement? 06:44:21
@_slack_skywater-pdk_U01GE4F371D:matrix.orgRob Taylor Mitch Bailey openlane uses openroad 07:13:01
@_slack_skywater-pdk_U01GE4F371D:matrix.orgRob Taylor interesting project here for anyone into HLS - https://github.com/google/xls/issues/370 07:13:21
@_slack_skywater-pdk_U01EK2VDMDG:matrix.orgAmro 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
@_slack_skywater-pdk_U01EYE54L5N:matrix.orgIztok 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
@_slack_skywater-pdk_U01EYE54L5N:matrix.orgIztok 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
@_slack_skywater-pdk_U01EYE54L5N:matrix.orgIztok 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
@_slack_skywater-pdk_U01EYE54L5N:matrix.orgIztok 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
@_slack_skywater-pdk_U01T0HJMKHA:matrix.orgDavid Murphy joined the room.03:20:37

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