How to erase/write/program the EEPROM?

[tinytseng]

i am doing a mmu design in a soc chip while the mmu manage the reading from/writing to Rom or Ram or EEprom

for i know little about the work scheme on EEprom,i want to learn about how to erase/write/program the EEprom.

are these work done by software? If so,what need my mmu do while doing these work?


help me,please

thanks :|

 

[kctang]

Re: mmu design help

Reading from eeprom is straight forward. However, the erase & program will take quite a long time and post serious performance impact on your chip if your CPU has to wait until the erase/program finishes.

My suggestion is to do simple read, but add data buffer for eeprom programming and status registers(or interrupts) such that the programmer can know when the erase/program finishes while he can do some other things (e.g. servicing interrupts, taking inputs..etc... as long as the code not trying to read eeprom region.

BTW, you can implement a state machine for EEPROM read & programming.

 

[bfkwan]

Re: mmu design help

a good way of doing this is to use state machine in a scheduler based kernel to avoid MCU being occupied by the write process. this allows the MCU to service other routine.
Assign status to EEPROM write process is a good way to probe the write process.