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NOR flash programming

jgauthier

Mar 22, 2013
63
Joined
Mar 22, 2013
Messages
63
I am going to implement a microcontroller based on ARM926 that boots from a NOR flash chip. I also want to program that NOR flash chip on board (non-removable). The programmer will power the chip, but while the rest of the circuit is off, I do not want to have the programmer power the rest of the circuit/board. SPI is used as the bus between processor and flash.

I'm wondering:
* What method should I use to provide two isolated power paths to the IC (one from the board, one from the programmer)
* Should I also implement this protection on the SPI lines?

Thanks!
 

bidrohini

Feb 1, 2023
164
Joined
Feb 1, 2023
Messages
164
I am going to implement a microcontroller based on ARM926 that boots from a NOR flash chip. I also want to program that NOR flash chip on board (non-removable). The programmer will power the chip, but while the rest of the circuit is off, I do not want to have the programmer power the rest of the circuit/board. SPI is used as the bus between processor and flash.

I'm wondering:
* What method should I use to provide two isolated power paths to the IC (one from the board, one from the programmer)
* Should I also implement this protection on the SPI lines?

Thanks!
You can also post this to the ARM community: https://community.arm.com/f
 
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