Specifications

Chapter 2 – Hardware Resources
36 PL 3120/PL 3150/PL 3170 Power Line Smart Transceiver Data Boo
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Reset Processing
During reset processing, the configuration checksum is checked first. If bad, and no configuration recovery options are
set, then a configuration checksum error is logged, the checksum repaired, and the device state is changed to
unconfigured. If the configuration recovery option is set, the configuration is recovered.
Next, the application checksum is checked. If bad, and the checksum error is in the system image, then a system image
checksum error is logged and the device state is changed to applicationless.
If the application checksum is bad, and no application recovery options are set, an application checksum error is logged
and the device state is changed to applicationless.
If the application checksum is bad and an application recovery option is set and the boot application does not contain
references to any off-chip ROM, flash, EEPROM, NVRAM, or RAM code, or there are no checksum errors in any of
these regions, then the application is recovered. Otherwise, an application checksum error is logged and the device goes
applicationless.
Signatures
All off-chip code areas have a 2-byte cyclic redundancy check (CRC) called the signature, immediately following the
area checksum. Signatures are stored in the code area and in the memory map. Mismatches between the area signature
and memory map copy of the signature result in the device going applicationless. This mechanism prevents a partial
application load over the network which is incompatible with any unloaded code (such as code in ROM).