Forum Discussion

fa_fpga_enthusiast's avatar
fa_fpga_enthusiast
Icon for Occasional Contributor rankOccasional Contributor
1 year ago

Nios V Hardware Interrupt Limitations

Hello, Based on the Nios V Processor Reference Manual and AN 978 Nios V Processor Migration Guidelines, Nios V supports only 16 hardware interrupts, whereas Nios II supports 32. Additionally, the Ex...
Nios Cpu
fa_fpga_enthusiast's avatar
fa_fpga_enthusiast
Icon for Occasional Contributor rankOccasional Contributor
7 months ago

Hello,

We wanted to check if there have been any updates or progress on this ticket.

Thank you very much for your support.

Best regards,

RichardH_Altera's avatar
RichardH_Altera
Icon for New Contributor rankNew Contributor
6 months ago

Hi,

The Nios V/g CPU now supports the Core Level Interrupt Controller, which extends the number of interrupt sources to 2048. The Nios V/c supports the ext_int input, which can be used to connect an external interrupt controller.

Kind regards,
Richard

  • fa_fpga_enthusiast's avatar
    fa_fpga_enthusiast
    Icon for Occasional Contributor rankOccasional Contributor
    6 months ago

    Hello,

    Thank you for the clarification.

    Could you please confirm from which Quartus version the following features are officially supported?

    1. Core Level Interrupt Controller support for Nios V/g (up to 2048 interrupt sources)
    2. Support for the ext_int interface on Nios V/c for connection to an external interrupt controller

    In particular, we would like to know whether these capabilities are already available in Quartus 25.1.

    Kind regards,

    • RichardH_Altera's avatar
      RichardH_Altera
      Icon for New Contributor rankNew Contributor
      6 months ago

      CLIC for Nios V/g is available in 25.1
      Interrupt support for Nios V/c will be available in 25.3.1

      Kind regards,
      Richard