Only 0 outputs in waveform simulation

[Mikolaj]

I have a problem with simulating schematics in Quartus II 13.1 Web Edition. I've tried to simulate several projects, but every simulation gives me 0s in the outputs. I remember that I accidentally changed something in the schematic of a specific block, but I don't know exactly what. I'm not sure if that is the problem, but reinstalling doesn't work.

[ShengN_Intel]

Hi,

Possible to provide the design file for better tracking down the problem?

Thanks,

Sheng

[FvM · Accepted solution]

Hi,
circuit behaviour is just as expected.

You have a quad DFF 74175 connected as circular shift register. All register are initially cleared, shifting "0000" will never result in a nonzero bit.