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Can this be done?

2004-03-01 by Kathy Quinlan

Can I emulate easily an EEPROM with an AVR ?

Problem: I have an Atmel USB DEV kit, it will not program the EEPROM via
the parallel port like it should. Atmel have taken 3 months soo far and
still it is not resolved.

I need to get an urgent job done, so I was thinking of using an 8515 or
Mega128 to emulate the EEPROM and download the code via RS-232.

The EEPROM is an AT25HP256, it is not the EEPROM that is faulty, it is
the GAL on the BOARD :o( (I wish they would email me the code for it
then I could knock something up.

The two options I am toying with :

#1 an AVR emulates the EEPROM

#2 the AVR programs the EEPROM and then tri states after programming so
that the EEPROM is connected to the DEV board


Which option seems the best ?

I do not want to be plugging and unplugging the EEPROM as it is in a
machine pin socket :o(

Regards,

Kat.

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