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ihp-sg13g2: "Horizontal congestion" violations in IO cells #2656

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dnltz opened this issue Jan 5, 2025 · 7 comments · Fixed by The-OpenROAD-Project/OpenROAD#6481
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ihp-sg13g2: "Horizontal congestion" violations in IO cells #2656

dnltz opened this issue Jan 5, 2025 · 7 comments · Fixed by The-OpenROAD-Project/OpenROAD#6481
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@eder-matheus
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grt Global Routing

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@dnltz
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dnltz commented Jan 5, 2025

Subject

[Stage]: Global Router.

Describe the bug

Global routing reports errors (GRT-0116) related to horizontally laid out IO cells. These violations are for IO to core connections. However, they're not even where the pins are located. Vertically laid out cells are fine.

Expected Behavior

Environment

I'm using a pre-built OpenROAD package: https://github.com/Precision-Innovations/OpenROAD/releases/tag/2024-12-14
and the (current) ORFS master rev (1cbce355ea39aed303f6354d8b285aec232483e0).

To Reproduce

Check-out #2655

Run make DESIGN_CONFIG=./designs/ihp-sg13g2/i2c-gpio-expander/config.mk. It should stop after ~ 2mins after global routing.

Relevant log output

OpenROAD v2.0-17598-ga008522d8 
Features included (+) or not (-): +Charts +GPU +GUI +Python : None
This program is licensed under the BSD-3 license. See the LICENSE file for details.
Components of this program may be licensed under more restrictive licenses which must be honored.
[INFO ORD-0030] Using 16 thread(s).
global_route -congestion_report_file ./reports/ihp-sg13g2/i2c-gpio-expander/base/congestion.rpt -congestion_iterations 30 -congestion_report_iter_step 5 -verbose
[INFO GRT-0020] Min routing layer: Metal2
[INFO GRT-0021] Max routing layer: TopMetal2
[INFO GRT-0022] Global adjustment: 0%
[INFO GRT-0023] Grid origin: (0, 0)
[INFO GRT-0043] No OR_DEFAULT vias defined.
[INFO GRT-0088] Layer Metal1  Track-Pitch = 0.4800  line-2-Via Pitch: 0.3650
[INFO GRT-0088] Layer Metal2  Track-Pitch = 0.4200  line-2-Via Pitch: 0.4100
[INFO GRT-0088] Layer Metal3  Track-Pitch = 0.4800  line-2-Via Pitch: 0.4100
[INFO GRT-0088] Layer Metal4  Track-Pitch = 0.4200  line-2-Via Pitch: 0.4100
[INFO GRT-0088] Layer Metal5  Track-Pitch = 3.4800  line-2-Via Pitch: 0.6200
[INFO GRT-0088] Layer TopMetal1 Track-Pitch = 2.2800  line-2-Via Pitch: 3.4100
[INFO GRT-0088] Layer TopMetal2 Track-Pitch = 4.0000  line-2-Via Pitch: 3.9500
[INFO GRT-0019] Found 50 clock nets.
[INFO GRT-0001] Minimum degree: 2
[INFO GRT-0002] Maximum degree: 17
[INFO GRT-0003] Macros: 0
[INFO GRT-0043] No OR_DEFAULT vias defined.
[INFO GRT-0004] Blockages: 408

[INFO GRT-0053] Routing resources analysis:
          Routing      Original      Derated      Resource
Layer     Direction    Resources     Resources    Reduction (%)
---------------------------------------------------------------
Metal1     Vertical            0             0          0.00%
Metal2     Horizontal     359455        172851          51.91%
Metal3     Vertical       317115        151992          52.07%
Metal4     Horizontal     359455        173636          51.69%
Metal5     Vertical        42195         10268          75.67%
TopMetal1    Horizontal      42485         10215          75.96%
TopMetal2    Vertical        21315         10786          49.40%
---------------------------------------------------------------

[INFO GRT-0101] Running extra iterations to remove overflow.
[INFO GRT-0197] Via related to pin nodes: 7246
[INFO GRT-0198] Via related Steiner nodes: 148
[INFO GRT-0199] Via filling finished.
[INFO GRT-0111] Final number of vias: 9142
[INFO GRT-0112] Final usage 3D: 33192

[INFO GRT-0096] Final congestion report:
Layer         Resource        Demand        Usage (%)    Max H / Max V / Total Overflow
---------------------------------------------------------------------------------------
Metal1               0             0            0.00%             0 /  0 /  0
Metal2          172851          2698            1.56%             1 /  0 /  1
Metal3          151992          2873            1.89%             0 /  0 /  0
Metal4          173636            65            0.04%             0 /  0 /  0
Metal5           10268            53            0.52%             0 /  0 /  0
TopMetal1          10215            45            0.44%             1 /  0 /  5
TopMetal2          10786            32            0.30%             0 /  0 /  0
---------------------------------------------------------------------------------------
Total           529748          5766            1.09%             2 /  0 /  6

[INFO GRT-0018] Total wirelength: 63057 um
[INFO GRT-0014] Routed nets: 1469
[ERROR GRT-0116] Global routing finished with congestion. Check the congestion regions in the DRC Viewer.
Error: global_route.tcl, 110 GRT-0116
Command exited with non-zero status 1
Elapsed time: 0:01.19[h:]min:sec. CPU time: user 1.12 sys 0.06 (99%). Peak memory: 215036KB.
violation type: Horizontal congestion
	srcs: net:sg13g2_IOPad_io_gpio_5_p2c
	comment: capacity:0 usage:1 overflow:1
	bbox = (309.6000, 316.8000) - (316.8000, 324.0000) on Layer -
violation type: Horizontal congestion
	srcs: net:sg13g2_IOPad_io_gpio_6_p2c
	comment: capacity:0 usage:1 overflow:1
	bbox = (309.6000, 468.0000) - (316.8000, 475.2000) on Layer -
violation type: Horizontal congestion
	srcs: net:sg13g2_IOPad_io_gpio_7_p2c
	comment: capacity:0 usage:1 overflow:1
	bbox = (309.6000, 547.2000) - (316.8000, 554.4000) on Layer -
violation type: Horizontal congestion
	srcs: net:sg13g2_IOPad_io_address_0_p2c
	comment: capacity:0 usage:1 overflow:1
	bbox = (727.2000, 518.4000) - (734.4000, 525.6000) on Layer -
violation type: Horizontal congestion
	srcs: net:sg13g2_IOPad_io_address_1_p2c
	comment: capacity:0 usage:1 overflow:1
	bbox = (727.2000, 583.2000) - (734.4000, 590.4000) on Layer -
violation type: Horizontal congestion
	srcs: net:sg13g2_IOPad_io_address_2_p2c
	comment: capacity:0 usage:1 overflow:1
	bbox = (727.2000, 705.6000) - (734.4000, 712.8000) on Layer -



### Screenshots

![image](https://github.com/user-attachments/assets/cdf4360a-0461-4db3-8a99-15e2217e6fd1)
![image](https://github.com/user-attachments/assets/69fea2c2-1a4b-4af8-b2c8-77188732c073)


### Additional Context

_No response_
@dnltz
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dnltz commented Jan 5, 2025

image

@dnltz
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dnltz commented Jan 5, 2025

image

@dnltz
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dnltz commented Jan 5, 2025

Uploaded screenshots again.

@dnltz
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dnltz commented Jan 5, 2025

This issue blocks #2655

@dnltz
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dnltz commented Jan 5, 2025

@maliberty sorry, cannot provide too much information since I'm using a pre-built version of OpenROAD. However, my design to reproduce this issue is in a pull-request and only takes a minute to build.

@maliberty maliberty added the grt Global Routing label Jan 6, 2025
@eder-matheus eder-matheus mentioned this issue Jan 7, 2025
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@eder-matheus
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@dnltz Fixed, please checkout to the latest master branch to get the fix for this issue. Let me know if you face other problems.

@dnltz
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dnltz commented Jan 9, 2025

@eder-matheus thanks a lot! I will try it

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grt: ensure on grid position near instance edge for macro and pad pins eder-matheus/OpenROAD
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@maliberty @dnltz @eder-matheus