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Visitor
Visitor
4,931 Views
Registered: ‎05-13-2008

Bram Configuration vs speed

I have a design that does a lot of calculations in the ISR: It does need about 50µs with a single bram of 64k.

 

Currently, the design takes about 60k of the bram, so I thought I decrease the size of the current bram to 32k and add another bram with 64k and put the huge .text -section in it.

 

Problem is: With the same code the ISR now needs 4 times longer: 200µs.

 

If I remove the second bram it is back to 64k.

Any ideas why? -Or can point me to the right documentation where I can find the answer?

 

Thanks,

Erik

 

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Visitor
Visitor
4,871 Views
Registered: ‎05-13-2008

aah ok, my extra bram is connected to an opb bus, not lmb. Looks like the opb is 4 times slower then.
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