Code execution from external RAM

[mbadanai]

Posted on October 19, 2009 at 12:31

Code execution from external RAM

#fsmc-code-execution-slow-in-sram #poorly-chosen-micro

[Tesla DeLorean]

Posted on January 15, 2014 at 20:42

It's always going to be egregiously slow. The pins transition on a 84 MHz clock, and several transitions are required for a complete transaction.

The SDRAM on the 429 is 6x slower

The FLASH while intrinsically slow is protected by a caching mechanism that in some cases makes it faster than Internal SRAM.

Solutions, run your code that's critical from Internal SRAM, or pick a more suitable processor with a proper cache architected into the design.