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Altera_Forum
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15 years ago

Code in tightly coupled memory

Hi all, I placed a function in a section different from the main code. More exactly, my code is mapped to sdram and I linked a function testcall() into a tightly coupled memory section which I pr...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

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If ISR function is that short I wouldn't expect great performance improvements with TTC. Probably most of the performance losses are due to ISR dispatcher.

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Definitely be sure to include the interrupt vector custom instruction. This replaces slow C code which is calculating and jumping to the vector.

I put ISRs in TCM because I guessed that the ISR would rarely if ever be in cache and I wanted it to execute as fast as possible. TCM executes as if it's in cache.

Bill