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Forum: FPGA, VHDL & Verilog problem with Isim simulation, I need your help


Author: Abubakar Saidu (Company: student) (lbones)
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Hello! Am trying to simulate a project(64-bit AlU using VHDL) but when I 
try simulating, it tells me 'completed successfully' then a window pop 
ups writing 'elaborating' then it terminates and writes 'Isim M.53d 
signture... Error' despite the fact that the the behavioural check 
syntax was succesful.  Please I really need your assistance because am 
still learning VHDL, the file is too large, but u can write me your 
email address so that I can send it to you,here is mine... 
abbakar45@yahoo.com

Author: Bedienungsanleitungssucher (Guest)
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At first, and most importante we need to know the exact text of the 
error message(s). Second, post the source code here, even if it is 
large. We may not personally contact you (at least not until anybody is 
an acquaintance of you) You may do that by using the Button labeled 
"Durchsuchen" (which means "look up"). Clicking on it will open an 
explorer window (on windows) or any equivalent on your system and let 
you select a file. The button is located the second one right above the 
entry field for your posts. The other button labeled "attach more files" 
is used if you like to attach another file after having attached the 
first one.

Author: Abubakar Saidu (Company: student) (lbones)
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Attached files:

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Ok! thanks I have attached the file with the vhd extention though it 
suppos to have sub modules but I didn't see them

Author: Bedienungsanleitungssucher (Guest)
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You forgot to post the exact text of the error message(s).

Author: Abubakar Saidu (Company: student) (lbones)
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Am sorry! Here is it
"Isim M.53d (signature oxb869381d)
ERROR:the simulation failed to launch for the following reason;
The simulation shutdown unexpectedly during initialization. Please 
review the Isim log(isim.log) for details.
Please shutdown Isim and retry the simulation.it the problem persists, 
please contact xilinx support.
Time resolution is 1 fs
No active Database
Unable to execute live simulation command.
The simulation has terminated
ISIM>"
 This is the notification I got

Author: Bedienungsanleitungssucher (Guest)
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Uh. And what did you find out in the log file?

> Please review the Isim log(isim.log) for details.

On the other hand, you could try to clean the project and start 
elaboration/simulation again.

Author: Abubakar Saidu (Company: student) (lbones)
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I can't really interpret the Isim log, but here is what it wrote
"#Onerror resume
#wave add /
No active database
#run 100200 ns
Unable to execute live simulation command"

Author: Bedienungsanleitungssucher (Guest)
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OK. Such things happen for example, if you do not have a testbench 
and/or did not define it as toplevel. Unfortunately you didn't tell us, 
whether the simulation was working until the problem with that very 
VHDL-Source or not. The former could be a hint, that you accidently 
selected the wrong file when starting the simulation. The latter that 
you accidently never selected the correct file or even didn't have such 
a file (with a testbench).


In short:
1. Check whether you have defined a testbench. If not, define one.
2. Check whether you selected the testbench when starting the 
simulation. If not, do so.

Author: Abubakar Saidu (Company: student) (lbones)
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I started learning fpga like a year back, so am not good at it

Author: Bedienungsanleitungssucher (Guest)
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Another reason could be, that you accidently didn't close a previous 
instance of the simulator.
Even if you explicitly did so, it may be, that the process(es) wasn't 
termined (which would be not your fault).
In doubt, close an ISIM window, check the process list and look for any 
process which does not belong to any open ISIM-Window. This happens not 
very frequently but sometimes.

Author: Bedienungsanleitungssucher (Guest)
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Abubakar Saidu wrote:
> I started learning fpga like a year back, so am not good at it

Which sentence shall tell us what? Either you apply yourself to the 
matter or leave it.

Your problem is not primarily related to FPGAs but to the software.
Within a year you should have been able to explore the IDE-menues and 
the ISIM-menues and likely came across some incidents like that.

Author: Abubakar Saidu (Company: student) (lbones)
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Thanks!
I will go through it again

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