Routing does not converge #5490

titan73 · 2024-08-01T12:22:04Z

titan73
Aug 1, 2024

The script used is simple without specific options:

Init design (lef, sdc, verilog, libs, ...)
Create floorplan   
make_tracks
global_placement
detailed_placement
clock_tree_synthesis -buf_list {.....}
detailed_placement
global_route -verbose -allow_congestion
detailed_route

The density of the design is 62% before detailed_route but there are a lot of violations and routing does not converge

[INFO DRT-0195] Start 0th optimization iteration.
    Completing 10% with 0 violations.
    elapsed time = 00:04:54, memory = 1888.33 (MB).
    Completing 20% with 0 violations.
    elapsed time = 00:09:39, memory = 2182.30 (MB).
    Completing 30% with 36459 violations.
    elapsed time = 00:11:35, memory = 2298.30 (MB).
    Completing 40% with 36459 violations.
    elapsed time = 00:18:27, memory = 2298.30 (MB).
    Completing 50% with 36459 violations.
    elapsed time = 00:21:16, memory = 2340.82 (MB).
    Completing 60% with 71345 violations.
    elapsed time = 00:26:20, memory = 2385.37 (MB).
    Completing 70% with 71345 violations.
    elapsed time = 00:30:40, memory = 2385.46 (MB).
    Completing 80% with 106713 violations.
    elapsed time = 00:32:15, memory = 2423.94 (MB).
    Completing 90% with 106713 violations.
    elapsed time = 00:39:50, memory = 2423.94 (MB).
    Completing 100% with 140130 violations.
    elapsed time = 00:41:59, memory = 2497.85 (MB).
[INFO DRT-0199]   Number of violations = 152274.
Viol/Layer      metal1     v1 metal2     v2 metal3    v3B me..4B pa..en alucap
Cut Spacing          0    331      0     67      0      8      0     16      0
Metal Spacing     7958      0  41116      0   6890      0   6687      0   2438
Min Hole             4      0    102      0      5      0      8      0      0
Minimum Cut          0      0      0      0      0      0     75      0      0
NS Metal             2      0      9      0      0      0      1      0      0
Recheck           1482      0   6483      0   3059      0    889      0    231
Short             8806    252  39445    103  18346     14   3363     38    337
SpacingRange      3163      0    451      0     95      0      0      0      0
[INFO DRT-0267] cpu time = 00:41:39, elapsed time = 00:42:02, memory = 2498.00 (MB), peak = 2498.00 (MB)

[INFO DRT-0195] Start 1st optimization iteration.
    Completing 10% with 152274 violations.
    elapsed time = 00:04:08, memory = 2498.00 (MB).
    Completing 20% with 152274 violations.
    elapsed time = 00:08:29, memory = 2498.00 (MB).
    Completing 30% with 139439 violations.
    elapsed time = 00:10:12, memory = 2498.30 (MB).
    Completing 40% with 139439 violations.
    elapsed time = 00:16:04, memory = 2498.30 (MB).
    Completing 50% with 139439 violations.
    elapsed time = 00:18:16, memory = 2498.30 (MB).
    Completing 60% with 126860 violations.
    elapsed time = 00:23:06, memory = 2498.56 (MB).
    Completing 70% with 126860 violations.
    elapsed time = 00:26:47, memory = 2498.56 (MB).
    Completing 80% with 113388 violations.
    elapsed time = 00:28:38, memory = 2498.77 (MB).
    Completing 90% with 113388 violations.
    elapsed time = 00:34:58, memory = 2498.77 (MB).
    Completing 100% with 100479 violations.
    elapsed time = 00:36:44, memory = 2498.84 (MB).
[INFO DRT-0199]   Number of violations = 100500.
Viol/Layer      metal1     v1 metal2     v2 metal3    v3B me..4B pa..en alucap
Cut Spacing          0     10      0      7      0      5      0      1      0
Metal Spacing     4647      0  31215      0   4818      0   3935      0    459
Min Hole             0      0     87      0      4      0      3      0      0
Minimum Cut          0      0      0      0      0      0     33      0      0
NS Metal             0      0      2      0      0      0      0      0      0
Recheck              0      0     20      0      1      0      0      0      0
Short             1111      0  33768      2  16584      2   2257      1     60
SpacingRange      1123      0    272      0     73      0      0      0      0
[INFO DRT-0267] cpu time = 00:36:02, elapsed time = 00:36:47, memory = 2498.84 (MB), peak = 2498.84 (MB)

It does not get any better after 16th iteration

[INFO DRT-0195] Start 16th optimization iteration.
    Completing 10% with 29619 violations.
    elapsed time = 00:09:25, memory = 2474.82 (MB).
    Completing 20% with 29619 violations.
    elapsed time = 00:15:16, memory = 2494.79 (MB).
    Completing 30% with 29254 violations.
    elapsed time = 00:16:50, memory = 2494.79 (MB).
    Completing 40% with 29254 violations.
    elapsed time = 00:36:22, memory = 2446.89 (MB).
    Completing 50% with 29254 violations.
    elapsed time = 00:40:13, memory = 2488.77 (MB).
    Completing 60% with 29176 violations.
    elapsed time = 00:53:06, memory = 2488.21 (MB).
    Completing 70% with 29176 violations.
    elapsed time = 00:56:43, memory = 2494.17 (MB).
    Completing 80% with 28849 violations.
    elapsed time = 01:11:32, memory = 2493.93 (MB).
    Completing 90% with 28849 violations.
    elapsed time = 01:28:08, memory = 2465.71 (MB).
    Completing 100% with 28200 violations.
    elapsed time = 01:29:10, memory = 2479.77 (MB).
[INFO DRT-0199]   Number of violations = 28272.
Viol/Layer      metal1     v1 metal2     v2 metal3    v3B me..4B alucap
Cut Spacing          0      6      0     18      0      1      0      0
Metal Spacing     3876      0   8228      0   2097      0   1129     16
Min Hole             0      0     29      0      1      0      0      0
Minimum Cut          0      0      0      0      0      0      3      0
Recheck              0      0    124      0      0      0      0      0
Short              334      0   6754      5   4382      0    590      5
SpacingRange       609      0     46      0     19      0      0      0
[INFO DRT-0267] cpu time = 01:28:48, elapsed time = 01:29:13, memory = 2479.77 (MB), peak = 2626.25 (MB)

With Innovus the density is 64% before starting routing. Routing converges pretty quickly:

#Start Detail Routing..
#start initial detail routing ...
#   number of violations = 8416
#
#    By Layer and Type :
#	          MetSpc    Short     Loop   CutSpc   CShort      Mar   Others   Totals
#	metal1      1298     1765        5       18       22        0        1     3109
#	metal2       961     2723       19        0        1       25        9     3738
#	metal3       376      631        2        0        0        0        0     1009
#	metal4B      256      303        1        0        0        0        0      560
#	Totals      2891     5422       27       18       23       25       10     8416
#cpu time = 00:09:34, elapsed time = 00:02:26, memory = 2751.89 (MB), peak = 3977.32 (MB)
#start 1st optimization iteration ...
#   number of violations = 1734
#
#    By Layer and Type :
#	          MetSpc    NSMet    Short     Loop   CShort      Mar   Totals
#	metal1         6        0        4        2        1        0       13
#	metal2       295        5      551       39        0        4      894
#	metal3       278        0      336       41        0        0      655
#	metal4B      100        0       70        2        0        0      172
#	Totals       679        5      961       84        1        4     1734
#    number of process antenna violations = 4
#cpu time = 00:04:25, elapsed time = 00:01:07, memory = 2750.27 (MB), peak = 3977.32 (MB)
#start 2nd optimization iteration ...
#   number of violations = 583
#
#    By Layer and Type :
#	          MetSpc    NSMet    Short     Loop      Mar   Totals
#	metal1         3        0        4        0        0        7
#	metal2       162        1      224        5       12      404
#	metal3        34        0      108        0        0      142
#	metal4B       26        0        4        0        0       30
#	Totals       225        1      340        5       12      583
#    number of process antenna violations = 4
#cpu time = 00:01:33, elapsed time = 00:00:27, memory = 2748.33 (MB), peak = 3977.32 (MB)
#start 3rd optimization iteration ...
#   number of violations = 186
#
#    By Layer and Type :
#	          MetSpc    Short     Loop   Totals
#	metal1         1        0        0        1
#	metal2        43       48        3       94
#	metal3        15       68        0       83
#	metal4B        8        0        0        8
#	Totals        67      116        3      186
#    number of process antenna violations = 4
#cpu time = 00:00:35, elapsed time = 00:00:10, memory = 2747.02 (MB), peak = 3977.32 (MB)
#start 4th optimization iteration ...
#   number of violations = 115
#
#    By Layer and Type :
#	          MetSpc    Short     Loop   Totals
#	metal1         1        0        0        1
#	metal2        23       28        1       52
#	metal3         4       53        0       57
#	metal4B        5        0        0        5
#	Totals        33       81        1      115
#    number of process antenna violations = 4
#cpu time = 00:00:13, elapsed time = 00:00:05, memory = 2744.67 (MB), peak = 3977.32 (MB)
#start 5th optimization iteration ...
#   number of violations = 63
#
#    By Layer and Type :
#	          MetSpc    Short   Totals
#	metal1         1        0        1
#	metal2        18       21       39
#	metal3         5       14       19
#	metal4B        4        0        4
#	Totals        28       35       63
#    number of process antenna violations = 4
#cpu time = 00:00:12, elapsed time = 00:00:04, memory = 2743.11 (MB), peak = 3977.32 (MB)
#start 6th optimization iteration ...
#   number of violations = 52
#
#    By Layer and Type :
#	          MetSpc    Short   Totals
#	metal1         2        0        2
#	metal2        14       18       32
#	metal3         5        9       14
#	metal4B        4        0        4
#	Totals        25       27       52
#    number of process antenna violations = 4
#cpu time = 00:00:09, elapsed time = 00:00:03, memory = 2741.52 (MB), peak = 3977.32 (MB)
#start 7th optimization iteration ...
#   number of violations = 46
#
#    By Layer and Type :
#	          MetSpc    Short     Loop WireFuse   Totals
#	metal1         2        0        0        0        2
#	metal2        10       16        1        1       28
#	metal3         5        7        0        0       12
#	metal4B        4        0        0        0        4
#	Totals        21       23        1        1       46
#    number of process antenna violations = 4
#cpu time = 00:00:09, elapsed time = 00:00:02, memory = 2741.37 (MB), peak = 3977.32 (MB)
#start 8th optimization iteration ...
#   number of violations = 38
#
#    By Layer and Type :
#	          MetSpc    Short     Loop   Totals
#	metal1         0        0        0        0
#	metal2        10       12        1       23
#	metal3         4        6        0       10
#	metal4B        5        0        0        5
#	Totals        19       18        1       38
#    number of process antenna violations = 4
#cpu time = 00:00:04, elapsed time = 00:00:02, memory = 2738.55 (MB), peak = 3977.32 (MB)
#start 9th optimization iteration ...
#   number of violations = 35
#
#    By Layer and Type :
#	          MetSpc    Short   Totals
#	metal1         1        0        1
#	metal2        12        9       21
#	metal3         0        6        6
#	metal4B        7        0        7
#	Totals        20       15       35
#    number of process antenna violations = 4
#cpu time = 00:00:03, elapsed time = 00:00:01, memory = 2738.74 (MB), peak = 3977.32 (MB)
#start 10th optimization iteration ...
#   number of violations = 36
#
#    By Layer and Type :
#	          MetSpc    Short   Totals
#	metal1         1        0        1
#	metal2         9        7       16
#	metal3         6       10       16
#	metal4B        3        0        3
#	Totals        19       17       36
#    number of process antenna violations = 4
#cpu time = 00:00:04, elapsed time = 00:00:01, memory = 2739.29 (MB), peak = 3977.32 (MB)
#start 11th optimization iteration ...
#   number of violations = 26
#
#    By Layer and Type :
#	          MetSpc    Short   Totals
#	metal1         0        0        0
#	metal2         8        5       13
#	metal3         1        6        7
#	metal4B        6        0        6
#	Totals        15       11       26
#    number of process antenna violations = 4
#cpu time = 00:00:03, elapsed time = 00:00:01, memory = 2739.16 (MB), peak = 3977.32 (MB)
#start 12th optimization iteration ...
#   number of violations = 13
#
#    By Layer and Type :
#	          MetSpc    Short   Totals
#	metal1         0        0        0
#	metal2         7        1        8
#	metal3         2        0        2
#	metal4B        3        0        3
#	Totals        12        1       13
#    number of process antenna violations = 4
#cpu time = 00:00:04, elapsed time = 00:00:02, memory = 2738.59 (MB), peak = 3977.32 (MB)
#start 13th optimization iteration ...
#   number of violations = 10
#
#    By Layer and Type :
#	          MetSpc    Short   Totals
#	metal1         0        0        0
#	metal2         5        2        7
#	metal3         0        0        0
#	metal4B        3        0        3
#	Totals         8        2       10
#    number of process antenna violations = 4
#cpu time = 00:00:02, elapsed time = 00:00:01, memory = 2738.09 (MB), peak = 3977.32 (MB)
#start 14th optimization iteration ...
#   number of violations = 11
#
#    By Layer and Type :
#	          MetSpc    Short      Mar   Totals
#	metal1         0        0        0        0
#	metal2         5        2        1        8
#	metal3         0        0        0        0
#	metal4B        3        0        0        3
#	Totals         8        2        1       11
#    number of process antenna violations = 4
#cpu time = 00:00:01, elapsed time = 00:00:00, memory = 2741.09 (MB), peak = 3977.32 (MB)
#start 15th optimization iteration ...
#   number of violations = 6
#
#    By Layer and Type :
#	          MetSpc    Short   Totals
#	metal1         0        0        0
#	metal2         3        1        4
#	metal3         0        0        0
#	metal4B        2        0        2
#	Totals         5        1        6
#    number of process antenna violations = 4
#cpu time = 00:00:01, elapsed time = 00:00:00, memory = 2742.84 (MB), peak = 3977.32 (MB)
#start 16th optimization iteration ...
#   number of violations = 3
#
#    By Layer and Type :
#	          MetSpc    Short   Totals
#	metal1         0        0        0
#	metal2         0        2        2
#	metal3         0        0        0
#	metal4B        1        0        1
#	Totals         1        2        3
#    number of process antenna violations = 4
#cpu time = 00:00:01, elapsed time = 00:00:00, memory = 2741.80 (MB), peak = 3977.32 (MB)
#start 17th optimization iteration ...
#   number of violations = 2
#
#    By Layer and Type :
#	          MetSpc    Short   Totals
#	metal1         0        0        0
#	metal2         0        1        1
#	metal3         0        0        0
#	metal4B        1        0        1
#	Totals         1        1        2
#    number of process antenna violations = 4
#cpu time = 00:00:00, elapsed time = 00:00:00, memory = 2743.80 (MB), peak = 3977.32 (MB)
#start 18th optimization iteration ...
#   number of violations = 2
#
#    By Layer and Type :
#	          MetSpc    Short   Totals
#	metal1         0        0        0
#	metal2         0        1        1
#	metal3         0        0        0
#	metal4B        1        0        1
#	Totals         1        1        2
#    number of process antenna violations = 4
#cpu time = 00:00:00, elapsed time = 00:00:00, memory = 2741.63 (MB), peak = 3977.32 (MB)
#start 19th optimization iteration ...
#   number of violations = 2
#
#    By Layer and Type :
#	          MetSpc    Short   Totals
#	metal1         0        0        0
#	metal2         0        1        1
#	metal3         0        0        0
#	metal4B        1        0        1
#	Totals         1        1        2
#    number of process antenna violations = 4
#cpu time = 00:00:00, elapsed time = 00:00:00, memory = 2741.88 (MB), peak = 3977.32 (MB)
#start 20th optimization iteration ...
#   number of violations = 1
#
#    By Layer and Type :
#	          Short   Totals
#	metal1        0        0
#	metal2        1        1
#	Totals        1        1

So I guess there is a problem somewhere. I don't know where to look at. Does anyone have an idea?

Some global GRT log:

[INFO GRT-0043] No OR_DEFAULT vias defined.
[INFO GRT-0004] Blockages: 501677

[INFO GRT-0053] Routing resources analysis:
          Routing      Original      Derated      Resource
Layer     Direction    Resources     Resources    Reduction (%)
---------------------------------------------------------------
metal1     Horizontal     195844         17023          91.31%
metal2     Vertical       194564        150624          22.58%
metal3     Horizontal     168520        142311          15.55%
metal4B    Vertical        83460         59960          28.16%
alucap     Horizontal      27948         22816          18.36%
---------------------------------------------------------------

[INFO GRT-0101] Running extra iterations to remove overflow.
[INFO GRT-0103] Extra Run for hard benchmark.
[INFO GRT-0197] Via related to pin nodes: 188924
[INFO GRT-0198] Via related Steiner nodes: 9130
[INFO GRT-0199] Via filling finished.
[INFO GRT-0111] Final number of vias: 326554
[INFO GRT-0112] Final usage 3D: 1340300
[WARNING GRT-0115] Global routing finished with overflow.

[INFO GRT-0096] Final congestion report:
Layer         Resource        Demand        Usage (%)    Max H / Max V / Total Overflow
---------------------------------------------------------------------------------------
metal1           17023         20202          118.67%             7 /  2 / 7864
metal2          150624        135508           89.96%             2 / 10 / 13314
metal3          142311        135651           95.32%            14 /  1 / 13771
metal4B          59960         49922           83.26%             2 /  4 / 2977
alucap           22816         19355           84.83%             3 /  1 / 2134
---------------------------------------------------------------------------------------
Total           392734        360638           91.83%            28 / 18 / 40060

TIA

titan73 · 2024-08-01T13:25:31Z

titan73
Aug 1, 2024
Author

Congestion report after global route in Innovus:

#  Congestion Analysis: (blocked Gcells are excluded)
#
#                 OverCon       OverCon       OverCon       OverCon          
#                  #Gcell        #Gcell        #Gcell        #Gcell    %Gcell
#     Layer           (1)           (2)           (3)           (4)   OverCon
#  --------------------------------------------------------------------------
#  metal1        1(0.01%)      0(0.00%)      0(0.00%)      0(0.00%)   (0.01%)
#  metal2      371(1.50%)     57(0.23%)     10(0.04%)      2(0.01%)   (1.78%)
#  metal3      155(0.63%)     32(0.13%)      2(0.01%)      0(0.00%)   (0.76%)
#  metal4B      39(0.17%)      1(0.00%)      2(0.01%)      0(0.00%)   (0.18%)
#  --------------------------------------------------------------------------
#     Total    566(0.66%)     90(0.10%)     14(0.02%)      2(0.00%)   (0.78%)
#
#  The worst congested Gcell overcon (routing demand over resource in number of tracks) = 4
#  Overflow after GR: 0.22% H + 0.56% V

0 replies

maliberty · 2024-08-01T13:59:32Z

maliberty
Aug 1, 2024
Maintainer

We do write the drcs out to a file where they can be reloaded in the GUI. I suggest loading them and see if you can detect any pattern or common themes. Its hard to say much from this level of detail.

8 replies

titan73 Aug 18, 2024
Author

The 'Dn' 'SapcinfRanging' message is even more mysterious. SapcinfRanging doesn't even occur in the source code of OR - did you mean SpacingRange? Can you show the line from the drc file containing Dn?

Oh sorry, yes it's SpacingRange. "Dn" does not appear anywhere in the drc file.

maliberty Aug 18, 2024
Maintainer

Does 'Dn' appear in your design or tech data? I still don't know where it comes from.

titan73 Aug 18, 2024
Author

No. They don't have any "Dn". I'll search OR code for the message.

titan73 Aug 18, 2024
Author

Code doesn't not help.

Selected Gui::makeSelected(const std::any& object)
{
  if (!object.has_value()) {
    return Selected();
  }

  auto it = descriptors_.find(object.type());
  if (it != descriptors_.end()) {
    return it->second->makeSelected(object);
  }
  logger_->warn(utl::GUI,
                33,
                "No descriptor is registered for {}.",
                object.type().name());
  return Selected();  // FIXME: null descriptor
}

I don't know where these objects are made. No string "Dn".
By instrumentalizing the code, I dumped some other object type names appart from "Dn":

PN3odb5dbNetE
PN3odb6dbInstE
PN3odb11dbTechLayerE
PN3gui12DRCViolationE

Lools like generated name.

That said it's not a blocking issue. Maybe not worth spending time on it.

titan73 Aug 18, 2024
Author

I found it. These are mangled names for std::type_info which std::any uses:

$ echo "PN3gui12DRCViolationE" | c++filt -t
gui::DRCViolation*
$ echo "Dn" | c++filt -t
decltype(nullptr)

So it's not deep nwell. ;) It's just a null pointer. Not sure this is intended. I'd say no since there is a warning :/

maliberty · 2024-08-18T12:53:24Z

maliberty
Aug 18, 2024
Maintainer

In your description "The script used is simple without specific options..." has no call to pdngen. You say you are using pdngen. One of these is not correct.

1 reply

titan73 Aug 18, 2024
Author

Oh sorry. That was misleading. I was talking about placement & routing part which has no particular optimization options. Here is the full script:

read_lef technology.lef
read_lef sites.lef

read_lef nvm.lef
read_lef std_cells.lef

read_liberty nvm.lib
read_liberty std_cells.lib

read_verilog synth.v

link_design top_digital

read_sdc -echo constraints.pt

set db [ord::get_db_block]

read_def -floorplan_initialize floor.def

set fp_area [ord::get_die_area]

initialize_floorplan -die_area $fp_area -core_area $fp_area -site STDCELLS

make_tracks

set master [[[$db findInst NVM] getMaster] getName]

cut_rows -endcap_master $master -halo_width_x 5 -halo_width_y 5

insert_tiecells "STDCELLS_TIELX3/Z" -prefix "TIE_ZERO_"
insert_tiecells "STDCELLS_TIEHX3/Z" -prefix "TIE_ONE_"

add_global_connection -net VDDD -pin_pattern {^VDDD$} -power
add_global_connection -net GNDD -pin_pattern {^GNDD$} -ground

set_voltage_domain -power VDDD -ground GNDD

define_pdn_grid -name "Core"

add_pdn_stripe -followpins -layer metal1 -width 1.4

add_pdn_stripe -layer metal4B -width 6 -pitch 120 -spacing 9 -offset 60.4
add_pdn_stripe -layer alucap  -width 6 -pitch 280 -spacing 9 -offset 199.8

add_pdn_connect -layers {metal4B alucap}
add_pdn_connect -layers {metal1 metal4B}

pdngen

set_routing_layers -signal metal1-metal4B -clock metal1-metal4B

global_placement

detailed_placement

set clockBuffList { \
    STDCELLS_BFULX9 \
    STDCELLS_BFULX6 \
    STDCELLS_BFULX4 \
    STDCELLS_BFULX3 \
    STDCELLS_BFUL \
}

clock_tree_synthesis -buf_list $clockBuffList

detailed_placement

global_route -verbose -allow_congestion

detailed_route -output_drc violations.drc -output_cmap congestion_map.cmap -droute_end_iter 0

maliberty · 2024-08-18T18:23:25Z

maliberty
Aug 18, 2024
Maintainer

Its pretty hard to debug these issues without a test case. If you have a support contract with Precision Innovations then we could setup an NDA and exchange data.

1 reply

titan73 Aug 18, 2024
Author

I know. I passed the request to the hierarchy but no news so far. I don't how it will end up honestly.
I'll try to do smaller test case that reproduce each issue.

Provide feedback

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Routing does not converge #5490

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Routing does not converge #5490

titan73 Aug 1, 2024

Replies: 4 comments · 10 replies

titan73 Aug 1, 2024 Author

maliberty Aug 1, 2024 Maintainer

titan73 Aug 18, 2024 Author

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