Intel® Arria® 10 Hard Processor System Technical Reference Manual

ID 683711
Date 1/10/2023
Public

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29.6.1. MPU Standby and Event Interfaces

MPU standby signals are notification signals to the FPGA fabric that the MPU is in standby. Event signals are used to wake up the Cortex*-A9 processors from a wait for event (WFE) state. The following shows the signals in the interface:

  • h2f_mpu_eventi—Sends an event from logic in the FPGA fabric to the MPU. This FPGA‑to‑HPS signal is used to wake up a processor that is in a Wait For Event state. Asserting this signal has the same effect as executing the SEV instruction in the Cortex*-A9. This signal must be de‑asserted until the FPGA fabric is powered‑up and configured.
  • h2f_mpu_evento—Sends an event from the MPU to logic in the FPGA fabric. This HPS‑to‑FPGA signal is asserted when an SEV instruction is executed by one of the Cortex*-A9 processors.
  • h2f_mpu_standbywfe[1:0]—Indicates which Cortex*-A9 processor is in the WFE state
  • h2f_mpu_standbywfi[1:0]—Indicates which Cortex*-A9 processor is in the wait for interrupt (WFI) state

The MPU provides signals to indicate when it is in a standby state. These signals are available to custom hardware designs in the FPGA fabric.