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Old 11-24-2007, 01:06 PM
Jonathan Bromley
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Default Re: using fpga as programmable connection

On Sat, 24 Nov 2007 12:56:34 +0100, joe <[email protected]> wrote:

>i would like to use a small fpga (or cpld) on a pcb to make direct
>bidirectional connections between pins.
>basically it should act like a programmable "cable".
>is this kind of application possible using programmable logic?


Not with a conventional CPLD. You would need to know enough
about the signal flow to control the CPLD's output buffers.

There are plenty of bidi switch devices around (QuickSwitch
and suchlike). It might be a good idea to build a crosspoint
matrix of such switches, and then use a small CPLD to control
the enables.

Lattice have a really interesting product that might suit
your needs:
http://www.latticesemi.com/products/...ct/ispgdx2.cfm

I have no idea about price, availability and development tools
for those parts.
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Jonathan Bromley, Consultant

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