Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

How many AltAccumulates?

Hi, I am looking to instantiate 48000 64bit AltAccumulates in a Cyclone 3 device running at a 200MHz data input rate into the FPGA i.e this is the frequency required to switch between them, althou...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

If the accumulator/register design doesn't fit the internal RAM, it can never fit register resources. No use in trying further. If internal RAM isn't sufficient, only external RAM (at best SSRAM for it's fast interface) can do. EP3C120 actually has enough RAM.

A simple calculation furthermore clarifies, that more parallelization (at least 4x64 Bit in parallel) would be needed with external RAM.