I am reviewing long FIR options with SHARC.
Usually the maximum length is a function of memory as opposed to MIPs.
Is there support for external memory? If yes, what is possible?
On the 21489, adding external SRAM is one option. This would be its only purpose.
On the 21469, DDR2 makes more sense.
On a sane 21479 (TQFP-100) package, a SPI based memory buffer would be possible.