Implementing echo on adsp 21262 I'm working on an echo implementation on the board adsp 21262. I've added a buffer to have more samples to work with. I end up then with 4 buffers of size 2048 each.

The problem is that I need to access at least 7000 samples back. (An echo can only be heard with a delay of 1/15th of a second, we have 2*48K~100k samples per second. So we need 100k/15~7k samples).

The problem is that 2048 samples per buffer is the max we can have because afterwards we're out of memory.
I'm trying to access the ROM but I have no idea as to how to do that. I've spent a lot of time looking for this information finds nothing.

Thank you !
Assuming you have this board, there are 512kByte of SRAM on the board. That should easily accommodate a 7k delay buffer.