8.2.4. Hard errors

The errors described in this chapter are all assumed to be soft errors, that is, one or more bits of the data stored in a RAM chunk are inverted. A new value can still be written to the RAM and read back correctly, unless another soft error occurs in the meantime.

If the error in the memory is a hard error, that is, a physical failure of the RAM circuit so that a bit can never be read or written reliably, the processor might not be able to correct and recover from the error. The processor contains features that enable it to recover from some hard errors. If you are implementing the processor and require these features, contact ARM to discuss the features and your requirements.

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