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Table 2-12 On-Chip Emulation Port Signals (Continued)
Signal
Signal
Name
Type
DR
Input
MOTOROLA
State
during
Reset
Input
Debug Request (DR)—The debug request input
provides a means of entering the Debug mode of
operation. This signal, when asserted (pulled low),
will cause the DSP to finish the current instruction
being executed, to save the instruction pipeline
information, to enter the Debug mode, and to wait
for commands to be entered from the debug serial
input line. While the DSP is in the Debug mode, the
user can reset the OnCE port controller by
asserting DR, waiting for an acknowledge pulse on
DSO, and then deasserting DR. It may be necessary
to reset the OnCE port controller in cases where
synchronization between the OnCE port controller
and external circuitry is lost. Asserting DR when
the DSP is in the Wait or the Stop mode, and
keeping it asserted until an acknowledge pulse in
the DSP is produced, puts the DSP into the Debug
mode. After receiving the acknowledge pulse, DR
must be deasserted before sending the first OnCE
port command. For more information, see Methods
Of Entering The Debug Mode in the DSP56000
Family Manual.
Note: If the OnCE port is not in use, an external
pull-up resistor should be attached to the DR
line.
DSP56009 User's Manual
Signal Descriptions
On-Chip Emulation (OnCE
Signal Description
TM
) Port
2-25
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