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Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

"design does not contain any logic" But it has NAND logic and test bench!

Hi, everyone!

I have run into the problem that below for 3 days:

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Error: Can't synthesize current design -- design does not contain any logic

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But the project included two files, one is testbench, and another is real source code.

Why does such problem (that there are no logic) happen ?

What setting or/and source code is wrong ?

Please tell me what perhaps is!

Thx!

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module hogege;

reg sw1, sw2;

wire led;

nandtest nandtest1 (sw1, sw2, led);

initial

begin

sw1<= 0;

sw2 <= 0;

# 5 sw2 <= 1;

end

always begin

# 10 sw1 <= ~sw1;

end

always begin

# 16 sw2 <= ~sw2;

end

initial $monitor($stime, " sw1=%b sw2=%b led=%b", sw1, sw2, led);

endmodule

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//verilog1.v

`timescale 1ns / 1ps

module nandtest(input sw1, sw2, output led);

assign led = ~(sw1 & sw2); // I think this is logic circuit

endmodule

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2 Replies

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

    The testbench code is ignored by the Quartus compiler, because it doens't support timed statements (#<timeinterval>). As a result, no logic is synthesized. Use ModelSim Altera Edition with HDL testbenches or Vector Waveform Files with Quartus Simulator.

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

    Thanks a lot!

    I could not know that from books...

    Now, I boot Tool > Launch EDA Simulation Library Compiler ( because I can't make Vector wave form, Linux edition)

    My PC has ModelSim from altera, and set the location where modelsim installed.

    The dialog recognized(as ModelSim altera starter edition Oct 1 2009),

    and Set Library language as Verilog. Device family is Max II.

    But I just get such dialog any time....

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    The ModelSim-Altera software comes packaged with precompiled simulation libraries.

    Do not compile simulation libraries if you are using the ModelSim-Altera software.

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    What does it means? I just installed ModelSim, had not converted it at any.

    Please tell me what should I do ?

    Help please!Thx!