exception of Cortex-R4F

Haggy

Other Parts Discussed in Thread: TMS570LS3137-EP

I use TMS570LS3137-EP of the built-in Cortex-R4F.
Please tell me the difference in the Undefined instruction exception and Abort (prefetch) exception.

I read the manual. Both think as in the case that can not decode the instructions.

over 9 years ago

0 Bob Crosby over 9 years ago

TI__Guru 72500 points

An undefined instruction is when the CPU fetches an instruction and decodes it, but finds that it is not a valid op-code. A pre-fetch abort is when the CPU fetches an instruction and the memory system responds that the address used does not support instruction execution. (It does not matter if the data is a valid op-code or not.)

0 Haggy over 9 years ago in reply to Bob Crosby

Intellectual 440 points

Hi Bob,
Thank you answer.
I want to generate a pre-fetch abort order to verify the software.
Where is the area that prefetch abort occurs?
Also, I want to know the reference page of the manual.

0 Anthony F. Seely over 9 years ago in reply to Haggy

TI__Guru 69050 points

You can branch to an area of memory that you have marked as execute never in the MPU, and you will get a prefetch abort.

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exception of Cortex-R4F