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Subject: ncelab: *W,BIGWBS
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Felix
Posts: 3
Online: User is Offline
3/12/2008 4:47 PM  
I am a newbie with NCSim.
 
I tried to elaborate a Verilog design with ncelab and this warning message was produced:
 
ncelab: *W,BIGWBS (,1140|38): bit-select index truncation.

I tried "nchelp ncelab BIGWBS" and it gave the following info:
 
The index in a bit-select has a width greater than a machine word, which is typically 32 bits. Only 32 bits are used.  
This truncation may result in undesired behavior.
 
 
Has Anyone come across this before?
 
Is it because of somthing wrong with my codes?
 
Is there any way to solve/get ride of/bypass this warning except using the "-NOWARN" OPTION?
 
Thanks
tmackett
Posts: 34
Online: User is Offline
3/12/2008 5:40 PM  
I'm a Cadence Field AE. Can you post the line of code with the instantiation and the line of code with the module and interface ports. The code showing the declaration of the variables would be helpfull too. I'll take a look at it, but this is the type of thing you should file thru sourcelink.cadence.com. Todd Mackett Field Applications Engineer, Incisive
Todd Mackett
Cadence Incisive
Felix
Posts: 3
Online: User is Offline
3/12/2008 7:15 PM  
I have just registered an account with sourcelink.cadence.com.
Do you mean I can submit a service request there?

The code is too large for posting here.
tmackett
Posts: 34
Online: User is Offline
3/12/2008 7:33 PM  
yes, if you think there's a bug, the sourcelink.cadence.com is always best.

I dont need all your code, i just want to look at the fragments that look like:

module aaa(........)
  some_module   some_module_inst(.lower(upper) ......)
.......
endmodule


module some_module (input b......)
    input Ε:0] b;
.......
endmodule

thats it!
Todd Mackett
Cadence Incisive
Felix
Posts: 3
Online: User is Offline
3/13/2008 6:43 PM  
Through further debugging I have identified the cause of this warning.

One array index instantiated in the netlist has the potential to store a value large than 32-bit.

Thanks for tmackatt for the fast response.

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Forums > Digital IC > Synthesis and test > ncelab: *W,BIGWBS


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