Why is the output waveform of Quartus 13.0 always at a low level?

鼻涕兽

Why is the output waveform of Quartus 13.0 always at a low level? [Copy link]

 

Newbie asks for advice

heningbo

Your first line is 2HZ and the third line is 1Hz. The two names are different. Is there no error?

heningbo

Have you used quartus to compile? If you did, there should be at least a warning. This problem is likely to occur when you start writing.

鼻涕兽

heningbo posted on 2019-4-8 08:43 Your first line is 2HZ and the third line is 1Hz. The two names are different. Is there no error?

It's still the same after changing it. It may be a software problem.

heningbo

Snot Beast posted on 2019-4-8 11:15 It's still the same after changing it. It may be a software problem.

It shouldn't be a software problem. What software did you use to simulate it and what did you change it to? Please post it and let us know.

heningbo

Try to write this program. If it still doesn't work, I can't help you.module XX( input clk, output reg clk_1hz ); reg [24:0] cnt; always@(posedge clk)begin if(cnt == 25'd24_999_999) cnt <= 25'd0; else cnt <= cnt + 25'd1; end always@(posedge clk)begin if(cnt == 25'd24_999_999) clk_1hz <= ~clk_1hz; else clk_1hz <= clk_1hz; end endmodule

LuJianchang

After Quartus II9.0, simulation must use the separately installed moalsim simulation software, and also write Testbench test files.

鼻涕兽

heningbo posted on 2019-4-8 16:04 It shouldn't be a software problem. What software did you use to simulate and what did you change it to? Please post it and let me see

I used VWF simulation and tried your program and the result was the same  

鼻涕兽

LuJianchang posted on 2019-4-9 09:08 After Quartus II 9.0, simulation must use the separately installed moalsim simulation software, and also write Testbench test files.

Can't use the built-in simulation software?

LuJianchang

Posted by Snot Beast on 2019-4-9 16:36 Can't use the built-in simulation software?

Well, since 9.0, it has been joint simulation.

LuJianchang

Posted by snotbeast on 2019-4-9 16:36 Can't use the built-in simulation software?

Modelsim simulation process: https://blog.csdn.net/sunlinyi66/article/details/41279953 Quartus II 15 installation and cracking tutorial: https://blog.csdn.net/yxswhy/article/details/79612383

鼻涕兽

LuJianchang published on 2019-4-10 08:54 Modelsim simulation process: https://blog.csdn.net/sunlinyi66/article/details/41279953 quartus ii 15 installation and breaking...

Thank you brother

郝旭帅

Yours is a simulation. If the counter has no initial value, it cannot be simulated. If you call the counter, it should have no value

鼻涕兽

Hao Xushuai published on 2019-4-14 10:59 Your simulation is for simulation. If the counter has no initial value, it cannot be simulated. You can check the counter. There should be no value...

Yes, I ignored this problem. Thank you, brother.

342141234242342

The simulation time is too short. The output flips once after 24999999 clocks. You didn't simulate for that long.

鼻涕兽

342141234242342 Published on 2019-4-28 15:00 The simulation time is too short. The output flips once after 24999999 clocks. You didn't simulate for such a long time

What parameters need to be adjusted during simulation?