Cyclone® V SX, ST and SE SoC Device Errata

ID 683618
Date 9/25/2015
Document Table of Contents 775419: PMU Event 0x0A Might Count Twice the LDM PC ^ Instruction with Base Address Register Write-Back


The LDM PC ^ instructions with base address register write-back might be counted twice in the PMU event 0x0A, which is counting the number of exception returns. The associated PMUEVENT[11] signal is also affected by this erratum and might be asserted twice by a single LDM PC ^ with base address register write-back.


Because of this erratum, the count of exception returns is imprecise. The error rate depends on the ratio between exception returns of the form LDM PC ^ with base address register write-back and the total number of exceptions returns


There is no workaround to this erratum.


Category 3