Forums

563xx address trace mode

Started by rathben March 26, 2002
I want to use address trace mode on the 56321 and 56303 so that I can
watch internal Pmem fetches with a logic analyzer. I would like to
use the logic analyzer in a mode where it is clocked from the DSP. Is
there any signal from the DSP that I could use for this?



--- In motoroladsp@y..., "rathben" <rathben@y...> wrote:
> I want to use address trace mode on the 56321 and 56303 so that I
can
> watch internal Pmem fetches with a logic analyzer. I would like to
> use the logic analyzer in a mode where it is clocked from the DSP.
Is
> there any signal from the DSP that I could use for this?

(This is for the benefit of the group, since the answer was provided
offline.)

Take a look at pages 29 (1-7), 168 (7-36), and 182 (9-4) of the
DSP56300 Family Manual (http://e-
www.motorola.com/brdata/PDFDB/docs/DSP56300FM.pdf):

According to the family manual, though, it would appear that the BCLK
pin does not exist on the 321, so you won't be able to use that
signal. I would try hooking it up anyway, since they may have bonded
that pin out internally and not documented that fact. In any event,
the driver for that pin will not allow full speed operation, even if
it is bonded out.

The best bet would be to model your algorithm with the 303 and then
move your code to the 321, as far as the internal versus external
accesses go.