Motorola DSP56305 Manuel d'utilisateur télécharger pdf (Page 102)

Debug and Test Support

Address Tracing

MOTOROLA Optimizing DSP56300/DSP56600 Applications B-3

• 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.

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Motorola DSP56305 Manuel d'utilisateur Page 102