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Encounter crashes

asicman

 Hi,

 I'm new to Encounter and I'm trying to get familiar with it. Encounter crashes when I try to use Wroute (global and final routing). Here is the output:

 


begin checkout products ...
Encounter_C 5.2
End checkout products.

Begin LEF/DEF in ...
Reading "project/libs/NangateOpenCellLibrary.lef" ...
Reading ".wroute.19027.def" ...
   *WARNING* design has no clock net
   *WARNING* design has no power net
   *WARNING* design has no ground net
   A total of 3 warnings.
Read in 20 layers, 10 routing layers, 1 overlap layer
Read in 134 macros, 16 used
Read in 61 components
  61 core components: 0 unplaced, 61 placed, 0 fixed
Read in 13 physical pins
  13 physical pins: 0 unplaced, 13 placed, 0 fixed
Read in 67 nets
Read in 213 terminals

Design has preferred via(s).

Distribution of nets (excluding special nets):
       24 ( 2        term),     26 ( 3        term),      7 ( 4        term),
        4 ( 5        term),      3 ( 6        term),      3 ( 7        term),
        0 (>=2000    term).
End LEF/DEF in: cpu: 0:00:01, real: 0:00:01, peak: 14.36 megs.

Begin global routing ...
Begin building data ...
Using automatically generated gcell grid instead of specified gcell grid

Gcell summary:
Layer             Gcell        Blocked Gcell        0-Track Gcell
-----------------------------------------------------------------
 1st routing       4410          0 (  0.00%)          0 (  0.00%)
 2nd routing       4410          0 (  0.00%)          0 (  0.00%)
 3rd routing       4410          0 (  0.00%)          0 (  0.00%)
 4th routing       4410          0 (  0.00%)          0 (  0.00%)
 5th routing       4410          0 (  0.00%)          0 (  0.00%)
 6th routing       4410          0 (  0.00%)          0 (  0.00%)
 7th routing       4410          0 (  0.00%)          0 (  0.00%)
 8th routing       4410          0 (  0.00%)          0 (  0.00%)
 9th routing       4410          0 (  0.00%)          0 (  0.00%)
10th routing       4410          0 (  0.00%)          0 (  0.00%)
-----------------------------------------------------------------
                  44100          0 (  0.00%)          0 (  0.00%)
End building data: cpu: 0:00:02, real: 0:00:02, peak: 78.58 megs.

Begin routing ...
Layer            Length   Down-Via  Over-track     Over-capacity
----------------------------------------------------------------
 1st routing        118          0           0       0 (  0.00%)
 2nd routing        489        247           0       0 (  0.00%)
 3rd routing        187        141           0       0 (  0.00%)
 4th routing         19          1           0       0 (  0.00%)
 5th routing          0          0           0       0 (  0.00%)
 6th routing          0          0           0       0 (  0.00%)
 7th routing          0          0           0       0 (  0.00%)
 8th routing          0          0           0       0 (  0.00%)
 9th routing          0          0           0       0 (  0.00%)
10th routing          0          0           0       0 (  0.00%)
----------------------------------------------------------------
                    813        389           0       0 (  0.00%)

Over-capacity details
Layer              1-2 tracks      3-4 tracks      5-6 tracks      >=7 tracks
------------------------------------------------------------------------------
 1st routing        0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
 2nd routing        0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
 3rd routing        0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
 4th routing        0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
 5th routing        0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
 6th routing        0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
 7th routing        0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
 8th routing        0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
 9th routing        0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
10th routing        0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
------------------------------------------------------------------------------
                    0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
End routing: cpu: 0:00:00, real: 0:00:00, peak: 78.58 megs.

Begin pass 1 optimization ...
Layer            Length   Down-Via  Over-track     Over-capacity
----------------------------------------------------------------
 1st routing        117          0           0       0 (  0.00%)
 2nd routing        498        253           0       0 (  0.00%)
 3rd routing        188        131           0       0 (  0.00%)
 4th routing         18          1           0       0 (  0.00%)
 5th routing          0          0           0       0 (  0.00%)
 6th routing          0          0           0       0 (  0.00%)
 7th routing          0          0           0       0 (  0.00%)
 8th routing          0          0           0       0 (  0.00%)
 9th routing          0          0           0       0 (  0.00%)
10th routing          0          0           0       0 (  0.00%)
----------------------------------------------------------------
                    821        385           0       0 (  0.00%)

Over-capacity details
Layer              1-2 tracks      3-4 tracks      5-6 tracks      >=7 tracks
------------------------------------------------------------------------------
 1st routing        0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
 2nd routing        0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
 3rd routing        0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
 4th routing        0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
 5th routing        0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
 6th routing        0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
 7th routing        0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
 8th routing        0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
 9th routing        0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
10th routing        0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
------------------------------------------------------------------------------
                    0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)      0 ( 0.00%)
End pass 1 optimization: cpu: 0:00:00, real: 0:00:00, peak: 78.58 megs.
End global routing: cpu: 0:00:02, real: 0:00:02, peak: 78.58 megs.

Begin final routing ...
Begin building data ...
End building data: cpu: 0:00:00, real: 0:00:00, peak: 78.58 megs.

Begin routing ...
Layer          H-Length   V-Length   Down-Via  Violation
--------------------------------------------------------
 1st routing        439          2          0         15
 2nd routing          7       1136        348          0
 3rd routing        271          0         59          0
 4th routing          0         47          9          0
 5th routing          1          0          2          0
 6th routing          0          0          0          0
 7th routing          0          0          0          0
 8th routing          0          0          0          0
 9th routing          0          0          0          0
10th routing          0          0          0          0
--------------------------------------------------------
                    719       1186        418         15
End routing: cpu: 0:00:16, real: 0:00:16, peak: 78.58 megs.

Begin pass 1 search repair ...
Layer          H-Length   V-Length   Down-Via  Violation
--------------------------------------------------------
 1st routing        439          3          0          1
 2nd routing          7       1135        343          0
 3rd routing        271          0         59          0
 4th routing          0         47          7          0
 5th routing          1          0          2          0
 6th routing          0          0          0          0
 7th routing          0          0          0          0
 8th routing          0          0          0          0
 9th routing          0          0          0          0
10th routing          0          0          0          0
--------------------------------------------------------
                    719       1186        411          1
End pass 1 search repair: cpu: 0:00:00, real: 0:00:01, peak: 78.58 megs.

Begin pass 2 search repair ...
Layer          H-Length   V-Length   Down-Via  Violation
--------------------------------------------------------
 1st routing        439          3          0          1
 2nd routing          7       1135        343          0
 3rd routing        271          0         59          0
 4th routing          0         47          7          0
 5th routing          1          0          2          0
 6th routing          0          0          0          0
 7th routing          0          0          0          0
 8th routing          0          0          0          0
 9th routing          0          0          0          0
10th routing          0          0          0          0
--------------------------------------------------------
                    719       1186        411          1
End pass 2 search repair: cpu: 0:00:00, real: 0:00:00, peak: 78.58 megs.

Begin pass 3 search repair ...
Layer          H-Length   V-Length   Down-Via  Violation
--------------------------------------------------------
 1st routing        439          3          0          0
 2nd routing          7       1135        343          0
 3rd routing        271          0         59          0
 4th routing          0         47          7          0
 5th routing          1          0          2          0
 6th routing          0          0          0          0
 7th routing          0          0          0          0
 8th routing          0          0          0          0
 9th routing          0          0          0          0
10th routing          0          0          0          0
--------------------------------------------------------
                    719       1186        411          0
End pass 3 search repair: cpu: 0:00:00, real: 0:00:00, peak: 78.58 megs.
End final routing: cpu: 0:00:17, real: 0:00:17, peak: 78.58 megs.

Begin DB out ...
Writing "binaryTo7Seg.wdb" ...
Written out 20 layers, 10 routing layers, 1 overlap layer
Written out 134 macros, 16 used
Written out 61 components
  61 core components: 0 unplaced, 61 placed, 0 fixed
Written out 13 physical pins
  13 physical pins: 0 unplaced, 13 placed, 0 fixed
Written out 67 nets, 67 routed
Written out 213 terminals
Written out 44100 gcells for 10 layers
Written out 284 real and virtual terminals
End DB out: cpu: 0:00:00, real: 0:00:00, peak: 78.58 megs.

Begin LEF/DEF/REF out ...
Writing ".wroute.19027.ref" ...
End LEF/DEF/REF out: cpu: 0:00:00, real: 0:00:00, peak: 78.58 megs.

Begin checkin products ...
Encounter_C
End checkin products.

Begin final report ...
Total wire length                    =       1905 (       719x       1186y)
Total number of vias                 =        411
Total number of violations           =          0
Total number of over capacity gcells =          0 (  0.00%)
Total CPU time used                  =    0:00:19
Total real time used                 =    0:00:50
Maximum memory used                  =   78.58 megs
End final report.

*** End WROUTE on Wed Nov 25 16:10:18 2009 ***
Reading REF file ".wroute.19027.ref" ...
version 1.000000
design binaryTo7Seg
status frouted
--- CASESENSITIVE ON
--- DIVIDERCHAR "/"
--- BUSBITCHARS "[]"
--- UnitsPerDBU = 1.0000
there are 70 columns
there are 63 rows
there are 27 vias
Encounter terminated by internal (SEGV) error/signal...
*** Stack trace in log file.

  • Hi there Asicman,

    My name is Brad Tree and I am a Cadence AE supporting our Encounter products. I have noticed a couple of things from your logfile that leads me to suggestions and questions for you.

    May I ask what version of encounter you are using? From the log, it may be encounter 5.2. Is that accurate? If you have the chance to come up to a newer version of the tool, that would be beneficial to you for many reasons. Since 5.2, there have been many major and minor releases of the tool. If that is not an option, it is not a showstopper though, for successful routing.

    If I may, why use wroute? Wroute was a great router for the day, but has been replaced for almost all digital routing at Cadence by NanoRoute, which is a native router within Encounter. In fact, NanoRoute has been improved a few years ago for handling cases where wroute was used for designs with only 2-3 routing layers.

    Let me know about your options what you think.

    Hope this helps - Brad Tree

  • Hi Brad Tree, After doing the routing I realized that the wroute should not have been used. I am learning to use Encounter so I'm going a lot of experimenting with the program. I hope you don't mind if I ask a few questions and would appreciate whatever assistance you can provide: -When is says: *WARNING* design has no clock net *WARNING* design has no power net *WARNING* design has no ground net I guess this is saying that I did not use encounter power planning to properly place my ground and power nets? But would this cause wroute to fail? -I read in some tutorials that we need an io file to specify the io pads, but I have however read some others which design without using the io file. Would this be something that is absolutely needed for the final design? After I used nanoroute (tsmc 018 technology) on my design, I see that it made connections to the boundaries of the chip for the io ports. Does this imply that the io file is not necessary? Thank you. -

  • I am glad that you are routing well with NanoRoute now.  I am happy to answer your questions.

    I am confident that your wroute segv was not caused by the WARNING messages.  These are standard messages under those conditions.  All it is saying is that those types of nets are not present.  Lets address the issues that it shows, though.

    Power nets are introduced into a design in encounter through the design import form.  If you look in the options tab that its labeled PWR/GND, you can add those global nets.  The global nets can then be connected using the globalNetConnect command or GUI forms, which is what I would recommend for a new user.  Then you can create rings and/or stripes with those global nets before placement and route. 

    As for the clock nets, you would define clock nets by inserting a clock tree, which is done after placement and before route.  For your design, you may or may not need a clock tree.

    As for the IO, if your netlist has IO cells in it, encounter will place those cells in a ring around the open area of the design.  If you do not have IO cells, then it will just place the ports on the perimeter.  It will place these at 0,0 at design import, and then move them as necessary when you place the design.  If you want then in a specific locations, then you should use the IO file.

    Hope this helps,

    Brad

     

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