How to put 2 or more fifos into 1 M9K in C3 device

Kaz,

I think it would still work, even with the pipe(although the output register could be removed). It's like time-sharing a DSP block, which could have multiple pipes in its path, it would just be running twice as fast and hence reading/writing data for each FIFO over the course of one regular clock cycle. The control/feedback paths are outside the memory, and would not be time-shared.

It's still not trivial, but I think it would work.