GR740-UM-DS, Nov 2017, Version 1.7 79 www.cobham.com/gaisler
GR740
6.11.3 Data scrubbing
There is generally no need to perform data scrubbing on either IU/FPU register files or the cache
memory. During normal operation, the active part of the IU/FPU register files will be flushed to mem-
ory on each task switch. This will cause all registers to be checked and corrected if necessary. Since
most real-time operating systems performs several task switches per second, the data in the register
files will be frequently refreshed.
The similar situation arises for the cache memory. In most applications, the cache memory is signifi-
cantly smaller than the full application image, and the cache contents is gradually replaced as part of
normal operation. For very small programs, the only risk of error build-up is if a part of the applica-
tion is resident in the cache but not executed for a long period of time. In such cases, executing a
cache flush instruction periodically (e.g. once per minute) is sufficient to refresh the cache contents.
6.11.4 Other considerations
Please see the application note Handling of External Memory EDAC Errors in LEON/GRLIB systems
[GR-AN-0004].
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