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<title>Jtag-Arm9 - JTAG interface for ARM9 Processors</title>
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<h1>Home made JTAG interface</h1>
<p>As part of getting the Jtag-Arm9 program going I had to create a simple
JTAG interface. This interface is just a simple buffer between the PC's
parallel port and the JTAG pins on the processor. </p>
<p>Modeled around the same pin out as the Macriagor Wiggler (to enable the
use of either with Jtag-Arm9), it is extremely simple. The circuit diagram can
be found here (<a href='circuit.png'>png</a> or <a href='circuit.txt'>txt
</a>).<p>
<p>Building the board is a simple proceedure, I have use SMD devices as they
were available through work and size wise they work quite nicely. There is
no reason why you can't use a large through hole devices, in fact it doesn't
even have to be a '244<p>
<p>The unused pins of the '244 where removed to allow the device to be soldered
down to 0.1" veroboard without them shorting out. The device is also fitted
at a slight angle to allow 'tracked out'.</p>
<h2>Bare Board</h2>
<img src='board1.png'alt='picture of bare circuit board'>
<h2>Front</h2>
<img src='board3.png'alt='picture of front of board'>
<h2>Reverse</h2>
<img src='board2.png'alt='picture of reverse of board'>
<p>Hope you guys have fun....<br>
Simon Wood. (c) July 2001</p>
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