--- In l..., "georgeioak" wrote: >
> OK then, how about P0.14, that also needs a pull-up too, right? Any
> other signals that we need to be aware of in order to program the
> part through JTAG?
OK then, how about P0.14, that also needs a pull-up too, right? Any
other signals that we need to be aware of in order to program the
part through JTAG?
--- In l..., "roger_lynx" wrote: >
> I beg to differ, KEIL schematic is correct.
> It is as ARM Ltd. says it ought to be:
>
> http://www.arm.com/support/faqdev/1277.html
>
> Perhaps something else is going on with your design?
> BTW, it may work either way, as long as TCK/RTCK do not float.
> Roger
>
> --- In l..., "georgeioak" wrote:
> >
> > Hello Everyone:
> >
> > We just started working on our first design based on the LPC2101 part. > > We have a Keil MDB2103 Eval Board and followed the
reference design > > schematic for the JTAG interface which showed TCK
and RTCK being
> > pulled down. We had nothing but troubles trying to get the ULINK JTAG > > adapter communicating and only after we changed
these 2 signals to > > being pull-ups did we successfully communicate and
download our code. > >
> > We had a few other problems going on and haven't gone back since we > > got everything working but I thought I would post a
question and see > > what others are doing to there JTAG signals and if
the schematic is > > incorrect from Keil.
> >
> > Thanks,
> > George
>
Reply by roger_lynx●November 21, 20062006-11-21
I beg to differ, KEIL schematic is correct.
It is as ARM Ltd. says it ought to be:
Perhaps something else is going on with your design?
BTW, it may work either way, as long as TCK/RTCK do not float.
Roger
--- In l..., "georgeioak" wrote: >
> Hello Everyone:
>
> We just started working on our first design based on the LPC2101 part.
> We have a Keil MDB2103 Eval Board and followed the reference design
> schematic for the JTAG interface which showed TCK and RTCK being
> pulled down. We had nothing but troubles trying to get the ULINK JTAG
> adapter communicating and only after we changed these 2 signals to
> being pull-ups did we successfully communicate and download our code.
>
> We had a few other problems going on and haven't gone back since we
> got everything working but I thought I would post a question and see
> what others are doing to there JTAG signals and if the schematic is
> incorrect from Keil.
>
> Thanks,
> George
>
Reply by georgeioak●November 21, 20062006-11-21
Hello Everyone:
We just started working on our first design based on the LPC2101 part.
We have a Keil MDB2103 Eval Board and followed the reference design
schematic for the JTAG interface which showed TCK and RTCK being
pulled down. We had nothing but troubles trying to get the ULINK JTAG
adapter communicating and only after we changed these 2 signals to
being pull-ups did we successfully communicate and download our code.
We had a few other problems going on and haven't gone back since we
got everything working but I thought I would post a question and see
what others are doing to there JTAG signals and if the schematic is
incorrect from Keil.