B.3 Address Tracing - Motorola DSP56600 Manual

• Force test data onto the outputs of a DSP or DSPs, while
replacing its boundary scan register in the serial data path
with a single bit register
• Enable a weak pull-up current device on all input signals of a
DSP or DSPs; this helps to ensures deterministic test results
in the presence of a continuity fault during interconnect
testing

B.3 ADDRESS TRACING

The Address Tracing (AT) mode is a feature that helps the user in
software development by generation of the internal program
address on the external address bus.
When the AT mode is enabled by setting the ATE bit in OMR, the
DSP56300/DSP56600 core reflects the addresses of internal fetches
and program space moves (MOVEM) to the External Address Bus,
if the Address Bus is not needed by the DSP56300/DSP56600 Core
for external accesses. During an Address Trace (AT) cycle, the RD
and WR strobes and the chip select or address attribute signals are
deasserted. This guarantees that an external device (e.g., memory)
that is connected to the external port will not be erroneously
activated.
The BCLK signal on the DSP56300/DSP56600 or the AT signal on
the DSP56600 indicates a new address on the Address Bus, for either
an AT cycle or a regular external memory or I/O access. The user
may sample the Address Bus with the rising edge of BCLK (or AT)
and sort between the AT cycles and the external accesses.
MOTOROLA Optimizing DSP56300/DSP56600 Applications
Debug and Test Support
Address Tracing
B-3