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Altera_Forum's avatar
Altera_Forum
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15 years ago

Low Voltage Input

Hi!

I want to feed an SDI Signal with a maximum high level of 800mV into an ALTERA CYCLONEII.

Unfortunatly the FPGA does not recognize this low voltage in my project.

Is there an option, maybe with the appropriate I/O assignment, where I can tell the FPGA to handle this input?

Thanks for your help.

Best regards

drehstrom

2 Replies

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

    Can you describe the source of that SDI signal? And what 'stream of data' if any does it represent?

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

    Cyclone II differential LVDS inputs have a specified common mode voltage of 0.1 to 2.0V. Thus they should be able to receive a 0.8V signal with the negative input connected to a reference voltage of e.g. 0.4 V.