Large fast FIFO?

[Morten Leikvoll]

I need a large FIFO memory, preferably as 2Mx32bit (150Mhz clock) and I
don't want to spend the time and bucks on FPGA+memory to do this. I have a
hard time finding this. Is it really that useless?
Any clues?

 

[Dwayne Surdu-Miller]

I'd looked into this issue a few times over the last few years. The
largest dedicated FIFO's you can find these days are 256Kx36. You
usually pay through the nose for them and they usually have excessive
lead times. They are manufactured by IDT with generic part number 72T36125.

We settled on implementing FIFOs with an FPGA, an SDRAM, SDRAM
controller IP, and a bit of custom logic. With this setup, considering
what parts are commonly available with short lead times, we wound up
with a 512Mx32 FIFO, which was way beyond what we were orginally looking
for.

The memory situation has gotten to the point where the small specialty
FIFOs are very expensive and generalized memory is really, really big,
but cheap as borscht.

Dwayne Surdu-Miller

 

[Dwayne Surdu-Miller]

Oops! I got my bit and word totals confused. What we wound up with was
a 16Mx32 FIFO, not 512Mx32. My apologies.

Dwayne Surdu-Miller