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Help reading/writing 2-Kbit serial presence detect (SPD) EEPROM
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flyrod:
Hello. I've got a computer project that I've run into a problem with. There are some little EEPROM chips that I need to adjust. I could buy a programmer, just for this project, but I figure there are people here who already have them and know how to use them. The chip is a ST M34C02 2-Kbit EEPROM for DDR1, DDR2 and DDR3 serial presence detect in a TSSOP8 package. I have several of them that I would like to read, compare the values, adjust, and write. I'm in the USA; can anyone help with this?
flyrod:
Anyone with a reader able to help?
coromonadalix:
you should adjust your location in you profile, you say you're in usa but it is set to afghanistan ??
Ian.M:
Its a bog-standard 2kbit I2C serial EEPROM. [datasheet].
What you can use to read and program it depends on what PC you have, its available ports and what OS you are running. Linux offers the most flexibility, but if you have a legacy PC with a real parallel port running Windows XP, Win9x or even DOS, there are various minimal hardware options. Anything more recent, and you are likely to need to invest in some sort of USB serial EEPROM programmer that can do I2C, though you could also access it using an Arduino and a sketch to dump it to the terminal and another sketch to write it back after editing, or (assuming you are a competent programmer) you could write an interactive I2C EEPROM editor sketch.
magic:
On Linux I literally used i2cget/i2cset to manually write a few bytes to some EEPROM once. It's relatively simple and wouldn't be hard to automate. On the hardware side, any VGA/DVI/HDMI port supported by open source drivers can do.
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