large FIFO buffer

[Adam Kumpf]

Hello all,

I am in the middle of laying out a design for a medical device the reads
in data pretty quickly (~20MHz) in bursts, but is limited to a slow serial
connection to transfer the data. The solution that comes to my mind is a
large FIFO buffer (~100k+) that can take an 8-bit parallel input, but I
can't find them anywhere in a reasonable price range. I've looked all over
at the common manufactures of logic devices (TI,nationalsemi) and some
distributors (digikey,mouser) but can't find much. I hear of hard drives
with 512k buffers/caches quite commonly. what am I missing here?

Does anyone know of a model/part# of a pretty high speed, 100k+ fifo
buffer?

Thanks in advance for your help.

Best Regards,
Adam Kumpf
kumpf@mit.edu
http://web.mit.edu/kumpf/www/kumpf-projects.html

 

"Adam Kumpf" <kumpf@mit.edu> wrote:

in data pretty quickly (~20MHz) in bursts, but is limited to a slow serial
connection to transfer the data. The solution that comes to my mind is a
large FIFO buffer (~100k+) that can take an 8-bit parallel input, but I
can't find them anywhere in a reasonable price range.

Dunno about input speed, but lots of folks back in the dark ages used
to make parallel printer buffers, I've got a Heathkit kicking around
somewhere that had parallel and serial inputs and outputs...

Can you throttle the input by handshaking slower? If so, that'd look
like the ideal solution for some kind of PIC. If not, you probably
have to build a high-speed buffer, which isn't rocket science, and use
a micro to spool it out.

How about a digital data capture board for a PeeCee?