Hard Processor System Technical Reference Manual: Agilex™ 5 SoCs
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4.2.7.1. Guidelines for Interrupt request from FPGA2HPS and GPIOs
The GIC clock is operating on mpu_periph_clk. The interrupt request using edge-trigger must be slower than the GIC clock to be able to capture the interrupt request.
Interrupt request from GPIOs and FPGAs are recommended to:
- Use level-triggered IRQs
OR
- Achieve minimum pulse width for edge-triggered IRQs at least 2 times the GIC clock (mpu_periph_clk) by:
- Slowing down the IRQ clock to be at least half of the GIC clock (mpu_periph_clk)
- Implementing at a pulse extension soft logic for edge-triggered IRQs