Forums

Help with JTAG DE Pin?

Started by robatacp November 11, 2003
I'm moving from using the 8323EVM to a production board and need
assistance with the JTAG port. Most of the JTAG connections seem
straight forward but I cannot find out where the JTAG pin DE goes!

I've been unable to trace DE from the 14-Pin JTAG connector to the
processor on the EVM schematics. What is DE used for and where does
it go?

If it should be obvious from the documentation just point out where.

Thanks...
Rob BTW:
I tried searching the archives but "JTAG DE" brings up just about
everything....



Interesting question Rob.

I too noticed the missing DE pin and was wondering whether my Command
Converter is going to work with these chips. I think the DE pin is an output
from the DSP to signal a debug event but does the debugger use this pin?

Regards,

Mick

----- Original Message -----
From: "robatacp" <>
To: <>
Sent: Tuesday, November 11, 2003 6:56 PM
Subject: [motoroladsp] Help with JTAG DE Pin? > I'm moving from using the 8323EVM to a production board and need
> assistance with the JTAG port. Most of the JTAG connections seem
> straight forward but I cannot find out where the JTAG pin DE goes!
>
> I've been unable to trace DE from the 14-Pin JTAG connector to the
> processor on the EVM schematics. What is DE used for and where does
> it go?
>
> If it should be obvious from the documentation just point out where.
>
> Thanks...
> Rob > BTW:
> I tried searching the archives but "JTAG DE" brings up just about
> everything.... >
>
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/DE is Debug Event pin. As an input, it is a means of
entering debug mode of operation from an external
cammand controller. As an output, it is a means of
acknowledge that the chip has entered debug mode. What
my understand is that /DE pin is not being used in
Metrowerks tools. So that why Motorola does not have
this pin on 8323 package. I strongly suggest you
contact Motorola on this issue.

C.W
--- robatacp <> wrote:
> I'm moving from using the 8323EVM to a production
> board and need
> assistance with the JTAG port. Most of the JTAG
> connections seem
> straight forward but I cannot find out where the
> JTAG pin DE goes!
>
> I've been unable to trace DE from the 14-Pin JTAG
> connector to the
> processor on the EVM schematics. What is DE used
> for and where does
> it go?
>
> If it should be obvious from the documentation just
> point out where.
>
> Thanks...
> Rob > BTW:
> I tried searching the archives but "JTAG DE" brings
> up just about
> everything.... >


__________________________________


Charlie,
Thanks for the information.
It looks like we can ignore the DE pin and know the reason why.

Rob ----- Original Message -----
From: "Charlie W" <>
To: "robatacp" <>; <>
Sent: Tuesday, November 11, 2003 3:58 PM
Subject: Re: [motoroladsp] Help with JTAG DE Pin? > /DE is Debug Event pin. As an input, it is a means of
> entering debug mode of operation from an external
> cammand controller. As an output, it is a means of
> acknowledge that the chip has entered debug mode. What
> my understand is that /DE pin is not being used in
> Metrowerks tools. So that why Motorola does not have
> this pin on 8323 package. I strongly suggest you
> contact Motorola on this issue.
>
> C.W
> --- robatacp <> wrote:
> > I'm moving from using the 8323EVM to a production
> > board and need
> > assistance with the JTAG port. Most of the JTAG
> > connections seem
> > straight forward but I cannot find out where the
> > JTAG pin DE goes!
> >
> > I've been unable to trace DE from the 14-Pin JTAG
> > connector to the
> > processor on the EVM schematics. What is DE used
> > for and where does
> > it go?
> >
> > If it should be obvious from the documentation just
> > point out where.
> >
> > Thanks...
> > Rob
> >
> >
> > BTW:
> > I tried searching the archives but "JTAG DE" brings
> > up just about
> > everything....
> >
> >
> > __________________________________ > ---
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