Re: FM24C256 serial EEPROM, doubt in page write mode

Hiii,

>I was just interfacing my ATmega128 uc with FM24C256 EEPROM on i2c >bus. The datasheet of the eeprom mentions a Page Write mode, where it >says that the memory is devided into pages of 64byte each, starting at >addresses 0x0040, 0x0080..and so on. >the datasheet says that in page write mode we can continuously write >max of 64bytes and if more byte are sent to the eeprom, they will roll- >over to the starting address of the page, rather than getting written >into the next page. >So, i wrote a code to write n read the eeprom. It works fine. >now, the doubt is, when i sent more than 64bytes continuously, the >excess bytes are getting written into the next page rather than >rolling-over and getting written to the same page beginning, which i >confirmed by reading the pages one by one. >well, this doesn't do any harm, but i'm just curious, how come >datasheet is wrong?? or did i misunderstand something?? > >Thanx.

There are subtle differences between manufacturers of eeproms, and page-write behaviour can be different. If you have the correct datasheet for the maker of your eeprom, it is also possible the that datasheet has been copy-and-pasted from previous versions and they didn't update it properly. Or they did a die rev.

The wrap-to-start behaviour is rarely useful, so people would be unlikely to notice as it;s unlikely to have been used. However anyone designing around a chip that does cross boundaries 'properly', and then encountering one that same-page-wrapped would quickly see problems. (e.g. when production changes supplier...)

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Mike Harrison
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