SWRZ115B March 2021 – May 2024 AWR1843AOP
Invalid Pre-fetch from MSS CR4 Processor (due to Speculative Read Operation from Tightly Coupled Memory Instance) Leads to Generation of MSS_ESM Group 3 Channel 7: MSS_TCMA_FATAL_ERR
AWR1843AOP ES1.0
The CR4 processor may perform an invalid pre-fetch access due to speculative TCM read leading to an invalid address access. This can result in a TCERROR and also a 2-bit ECC fatal error. The TCERROR is ignored by the processor since these correspond to instructions that are pre-fetched but never executed. However, the invalid MSS_TCMA_FATAL_ERR is generated on the ESM group3 channel-7.
Implication: In case of a genuine TCMA ECC fatal error, nERROR will not be generated directly through ESM.
Mask Group 3 channel 7: MSS_TCMA_FATAL_ERR to ESM can be masked by writing into MSS_RCM:ESMGATE0 register. CR4F abort handler should handle the nERROR generation
OR
Disable branch prediction for MSS-CR4F