ebay - cardamatic

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Wed Feb 16 17:13:07 2005

> I have heard some TTL logic designs where very bad too.

Alas yes.... Mostly where the so-called designer decided to adulterate
the circuit with RC delays (not that those are _necessarily_ bad. They're
like GOTOs in programming. Can be useful, but all to easy to misuse...)

But I never came across a designer who'd randomly change TTL AND gates
for OR gates in the hope it improved matters...

> From what little I have seen FPGA's 99% is VHDL and VERLOG

The FPGA tools I used started with a schematic capture program. And I
certainly saw so-called designers who'd make what appeared to be random
chagnes (and who couldn't explain their changes), recompile, and hope for
the best.

Oh, and I rememebr many late nights going through the output of that
compiler to see what mess it had made of my design this time. Patching
the output (there was a program that let to display the result as a map
of the logic blocks on the chip and edit the result) was common...

-tony
Received on Wed Feb 16 2005 - 17:13:07 GMT