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?