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fa_fpga_enthusiast's avatar
fa_fpga_enthusiast
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11 months 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
RichardH_Altera's avatar
RichardH_Altera
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25 days 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
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25 days 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
    24 days 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