Calculation Data - Philips CEM2100/00 Service Manual

20.8.2 Calculation data

The data used to calculate the checksum is listed in Table 20-15.
Table 20-15 Checksum Calculation Data
Operating Mode
Flash memory writing mode
Flash memory SUM output
mode
RAM loader mode
Product ID Code
Output mode
Flash Memory Status Output mode
Flash Memory Erasing mode
Calculation Data
Data in the entire area of the flash memory
RAM data written in the first received RAM
address through the last received RAM address
9th through 18th bytes of the transferred data
9th through 12th bytes of the transferred data
All data in the erased area of the flash memory
(the whole or part of the flash memory)
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Description
Even when a part of the flash memory is written, the checksum
of the entire flash memory area (1000H to FFFH) is calculated.
The data length, address, record type and checksum in Intel
Hex format are not included in the checksum.
The length of data, address, record type and checksum in Intel
Hex format are not included in the checksum.
For details, refer to " 20.11 Product ID Code ".
For details, refer to " 20.12 Flash Memory Status Code "
When the sector erase is executed, only the erased area is
used to calculate the checksum. In the case of the chip erase,
an entire area of the flash memory is used.
T5CL8