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# ncverilog simulation overflow

Last post Mon, Jun 25 2012 9:19 AM by Andrew Beckett. 2 replies.
 Started by dzkxybx 24 Jun 2012 09:15 PM. Topic has 2 replies and 1504 views
• #### Sun, Jun 24 2012 9:15 PM

• dzkxybx
• Joined on Mon, Jun 25 2012
• Posts 1
• Points 20
ncverilog simulation overflow
 hi,   i am new here. I have a problem as below when i do my design simulation: 4038444601 OverflowSimulation stopped via \$stop(1) at time 40384446008 PS + 2how could this happens? thanks!and my timescale is 1ns/10ps
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• Post Points: 20
• #### Mon, Jun 25 2012 5:18 AM

• Quek
• Joined on Wed, Oct 14 2009
• Singapore, 00-SG
• Posts 1,063
• Points 16,155
Re: ncverilog simulation overflow
 Hi dzkxybxFrom the limited info which you had provided, it is very hard to guess the cause of the problem. If you are not using the latest version of ncverilog, would you please re-try using the latest version and see if the same problem occurs?Best regardsQuek
• Post Points: 20
• #### Mon, Jun 25 2012 9:19 AM

Re: ncverilog simulation overflow
 The limit for some considerable time has been about 9223 seconds - and you're hitting a limit much less than that. Are you using some prehistoric version of ncverilog? What does "ncverilog -version" say?e.g. simulating "ncverilog testmax.v" where testmax.v is: `timescale 1ps/1fsmodule top;reg a;initial a=1;always #100000000000 begin  a=~a;  \$strobe(\$time,,"a=%b",a);endendmoduleGives:...      9223368439474176 a=0    9223369655226368 a=1ncsim: *E,TRTOVF: simulated time overflow.          File: ./testmax.v, line = 9, pos = 7         Scope: top          Time: 9223370870978560 PS + 0./testmax.v:9 always #100000000000 begin
• Post Points: 5