NOR flash programming

[jgauthier]

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!

 

[Delta Prime]

Documentation – Arm Developer

developer.arm.com

 

[jgauthier]

Documentation – Arm Developer

developer.arm.com

This seems very specific to the Versatile/AB926EJ-S Single on board computer. But i could implement a physical switch like they are talking about. I'm just quite limited on space.

 

[bidrohini]

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!

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