Re: 16 MB REU clone

From: Marko Mäkelä (
Date: 2001-08-22 13:19:12

On Wed, 22 Aug 2001, Ruud Baltissen wrote:

> Hallo Marko, Rainer,
> > It seems that the smallest chip in this Xilinx Spartan-II family (XC2S15,
> > 100 pins) could otherwise do the job.
> What hardware do you use to test if you can use this FPGA? Can one build it
> hisself?

I was just referring to the data sheets from the manufacturer's web pages.

Soldering surface mounted chips is not impossible, but manufacturing the
circuit board requires some equipment.  Luckily a friend of mine has
access to a plotter-like device that has small drills instead of pens.
This device can manufacture prototype boards with 0.2 mm (200 µm) line
widths, which should be enough even for tight SMD chips.  Using BGA chips
(whose contacts are small solder bubbles on the bottom side of the chip)
is still out of question.

I'm looking for solutions that are in-system programmable.  In that way,
the circuit board needs soldering only once, and everything else can be
made in small steps.


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