Intel® Arria® 10 Hard Processor System Technical Reference Manual

ID 683711
Date 8/28/2023
Public
Document Table of Contents

12.4.6.1.3. Counter Match Interrupt

The counter match interrupt allows you to set a threshold for the number of single-bit errors captured before an interrupt flag is set.

The INTONCMP bit in the INTMODE register enables the internal counter to count and compare against the SERRCNT value in the Single-Bit Error Count (SERRCNTREG) register. The internal counter increments on every single-bit error, regardless of whether it is a new or repeated address. The INTONCMP bit has no influence on the INTMODE and INTONOVF bits of the INTMODE register. As long as the internal counter is less than the Single-Bit Error Count (SERRCNTREG) register value, no interrupt is generated. When the internal counter is greater than or equal to the SERRCNTREG value, a single-bit interrupt request is asserted, the CMPFLGx bit is set in the Mode Status (MODSTAT) register, and the SERRPENx bit is set in the Interrupt Status (INTSTAT) register. When the match occurs, additional errors do not increment the counter until the CMPFLGx bit is cleared in the MODSTAT register.

This resultant match can be handled in three ways:

  • Reset the error counter without restarting it. The ECC controller does not count single-bit errors until you restart the counter. Set the CNT_RSTx bit in the CTRL register to 1, which clears the counter. The CMPFLGx bit remains set. The counter does not increment until the CMPFLGx bit is cleared.
  • Reset and restart the counter and clear the compare flag. Set CNT_RSTx bit in the CTRL register to 1, which clears the counter. Write a 1 to the CMPFLGx bit, which clears it. The internal counter begins counting from zero.
  • Set the count to a higher value and clear the compare flag. Write the SERRCNTREG value to a higher value than the initial compare match value. Write a 1 to the CMPFLGx bit. This clears the CMPFLGx bit, but the internal counter is not reset and the count continues from where it left off until it reaches the new SERRCNTREG value.

If you allow the counter to resume during your interrupt service routine (ISR), it is possible that the error counter could run out again before the ISR exits. If this happens, and you clear the interrupt and exit the ISR, you can never detect the new counter match condition. To avoid this problem, check the CMPFLGx bit in the MODSTAT register prior to exiting the ISR. If CMPFLGx indicates another counter match condition, ensure that you handle it.

To clear the single-bit error interrupt, set the SERRPENx bit in the INTSTAT register.