Forum Discussion

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

Nios II reset_n pulse requirements

I am creating logic in my FPGA that can reset the Nios II processor. How long does the low pulse on reset_n have to be and is there anything else I should know? I will have a Nios II processor, several Avalon MM peripherals, and custom logic functions.

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor

    It must be at least two clock cycles of your slowest clock in your SOPC Builder system (I would go with more than 2 for good measure). It'll get synchronized to all the clock domains used in your SOPC Builder system. The reset behavior is as follows:

    1) The system will be asynchronously reset

    2) The system will exit reset synchronously