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Design and implementation of the operation and maintenance software for a new GSM transcoder - page 17 / 26

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© NOKIA17 paavo.markkola@nokia.com18.10.2005

Implementation, Flash Manager

Needs to control all accesses to banked memories

flash and DSP code loading memory

Totally redesigned

Cannot handle operations that cross page boundaries

Page size is reduced from 256 kB to 64 kB

Flash interface is different as the flash device is different

Flash operations

Read – reads a number of words from flash

Write – programs a number of words to flash

Blank – erases (sets bits high) a number words in flash

Checksum – calculates checksum over an area in flash

Search – searches for a user defined string in flash

Flash sector size increased from 32 kB to 64 kB

Equal size flash buffer is required for flash write operations

64 kB out of 256 kB data memory is too much moved to DSP code loading memory

Write operations are not allowed when DSPs are being loaded

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