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Lpc2000

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RE: [lpc2000] Re: Debuging on Tini2131?

2005-10-09 by Randy M. Dumse

> Does NMI sell an adapter to let you connect a regular
> JTAG cable to the board?

The 20 pin JTAG connector is quite a waste of pins. There's only
a few active signals on the connector. A 20 pin connector would
dominate our boards, and in some cases, require us to double
their size. So on all our boards we have shrunk down to a 10 pin
JTAG connector. We have adapters that go from the JTAG connector
to the PC parallel port.

We could certainly come up with an adapter from our 10 to a
"regular" 20 if that's what folks want.

Since the parallel port on the PC is becoming legacy... We've
been working with MPE, to make a USB based "widget" for
development. http://www.mpeforth.com/jtagwidget.htm You'll
notice it is much faster than the wiggler.

> Some of us are mostly into software and we don't
> solder our own
> connectors unless we get super desparate.

On our other boards, we have usually just press fit the JTAG
connector in during downloads, and removed it when the JTAG was
not in use. This has proved quite satisfactory for the
occassional downloading of new code. It might not be convenient
for extended debug sessions. If someone wants the connector
soldered in, we'll be glad to do it. Just ask when ordering. But
by leaving it removeable, the form factor after programming is
much nicer without that extra connector sticking out sideways.

Randy
www.newmicros.com

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