Read-While-Write on MPC5675K Code Flash modules

JChMathae · ‎09-27-2021

Hello,

According to the MPC5675K Reference Manual in chapter 8 "Flash Memory", Read-While-Write accesses within a Flash module is not possible. That is, it is impossible to erase or program a Flash sector when executing code from another sector within the same Flash module.

But when I am using the Standard Software C90LC Driver it seems to do exactly that: executing from a Flash module sector when erasing/programming another sector within this same Flash module...

Where is the truth?!

Thank you for your help.

Best regards.

Hello,According to the MPC5675K Reference Manual in chapter 8 "Flash Memory", Read-While-Write accesses within a Flash module is not possible. That is, it is impossible to erase or program a Flash sector when executing code from another sector within the same Flash module.But when I am using the Standard Software C90LC Driver it seems to do exactly that: executing from a Flash module sector when erasing/programming another sector within this same Flash module...Where is the truth?!Thank you for your help.Best regards.

davidtosenovjan · ‎09-29-2021

Hi, by default bus stall happens instead of RWW, thus example will run even without relocation to SRAM.

However driver also includes macro COPY_TO_RAM, so you can simply relocate flash routine to the SRAM, what you should do in real application.

View solution in original post

davidtosenovjan · ‎09-29-2021

Hi, by default bus stall happens instead of RWW, thus example will run even without relocation to SRAM.

However driver also includes macro COPY_TO_RAM, so you can simply relocate flash routine to the SRAM, what you should do in real application.

JChMathae · ‎09-30-2021

David,

Thank you very much for your answer!

It explains a lot.

Thank you also for your little example on Data Flash use

Best regards.