Re: [avr-chat] AVRDragon support JTAG clock

[David VanHorn]

Definitely.  It's the edges that get you, not so much how often the edges happen.

Termination will probably help, as will a very low impedance ground connection, but shortening that cable is the best answer.

On Thu, Jul 11, 2013 at 12:40 PM, Joerg Wunsch <address@hidden> wrote:

coxster dillon <address@hidden> wrote:

> The shell switch -B does not seem to affect JTAG clock on the Dragon.

It does, but a reduced clock speed is no guarantee that *any* type of
cable would work.  The rule of thumb is that you can usually use an
STK500 ribbon cable successfully (which is about 15 cm) but not much
more, not even with slower clocking.

You could try a serial termination (a resistor of about 100 ohm at the
driving end of each line) if you really can't use a shorter
connection.
--
cheers, Joerg               .-.-.   --... ...--   -.. .  DL8DTL

http://www.sax.de/~joerg/
Never trust an operating system you don't have sources for. ;-)

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