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Altera_Forum's avatar
Altera_Forum
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16 years ago

Fast switching signal output

Hi, i'm a student. I'm using Altera De2 Board with Cyclone II and Quartus II tool.

1) In my project i have an output that switch fastly. The output pin don't follow it. In the oscilloscope i don't properly see the real signal .

How can i tell to Quartus that the signal is fast ?

2) Another problem. I have on the board an oscillator at 50 Mhz. I want to multiplicate the frequency without using the PLL (ALTPLL MEGAFUNCTION). Is it possible? Is the clock programmable?

I hope you can help me.

2 Replies

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

    1) how fast is your signal? If you decrease the frequency, do you see it on the oscilloscope?

    2) no
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    1) isn't a Quartus or FPGA problem. 50 MHz is send reliably with any availble FPGA I/O standard.