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Altera_Forum's avatar
Altera_Forum
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17 years ago

Simulating ROM( MegaWizard Plug-in manager)

Hi,

I am trying to implement a system in VERILOG which uses ROM: 1-PORT from the MegaWizard Plug-in Manager. I want to simulate the system using Modelsim-Altera.

I converted the .mif file to .hex file, and made changes in the megawizard created .v file to accept the .hex file as the memory initialization file.

I ran a RTL-level simulation through Quartus- 7.2 ( web edition) to open the Modelsim window. I created a new project which uses the current modelsim.ini file.

I compiled the altera_mf.v file and tried to simulate the top level.

But it gives me errors like

** warning: (vsim-3534) [fofir] - failed to open file "memory_init.hex" for reading.

# no such file or directory. (errno = enoent) : c:/altera/72/quartus/eda/sim_lib/altera_mf.v(785)

After reading on the altera website, I inserted the line

Veriuser=\eda\mentor\modelsim\convet_hex2ver.dll in the current modelsim.ini file.

But it again gives me an error like

Unable to find \eda\mentor\modelsim\convet_hex2ver.dll

Where am i going wrong? Can anyone list the steps for simulating the ROM correctly?

Thanks.

4 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    17 years ago

    I hadn't have correct results with modelsim altera and RTL simulations.

    Usually, i use the alltsyncram megafunction in ROM mode and a gate level simulation in modelsim altera 6.1g and quartus 7.2.
  • Altera_Forum's avatar
    Altera_Forum
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    17 years ago

    Several years ago I encountered the same issue. I believe to remember that convert_hex2ver.dll was missing the the installation folder. I copied this file from an older version of modelsim into the current installation and that helped.

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    17 years ago

    I've encountered this problem hours before. I copy the Hex file to the folder where the projects file is, and clear the path information in .v file, like altsyncram_component.init_file = "line_kbyte_buff.hex"

    Then it can work. And the .ver files also generated after simulation. :D
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    17 years ago

    I have a different simulation problem that the Modelsim (I use the ModelTech Modelsim not the Altera Modelsim) did not complain at all but the ROM output (q) was always zeros.

    I found that the .hex file must be at the same directory as the ROM .v file while you create the ROM and while you use the ROM in simulation.

    After I did that, it worked! ;)