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which is better for performance fetching instructions from flash or SRAM?

Hello,

If I copy the firmware to SRAM and start execute program from there using STM32F429 (which means that system bus is used to fetch instructions instead of I-code bus).

At this case do fetching instructions and data access can be carried out in parallel ? and which is better for performance fetching instructions from flash or SRAM?

( I know that SRAM is faster than FLASH).

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