Signal Descriptions
ARM DDI0198D Copyright © 2001-2003 ARM Limited. All rights reserved. A-7
A.4 Debug signals
Table A-3 describes the ARM926EJ-S processor debug signals.
Table A-3 Debug signals
Name Direction Description
COMMRX
Communications
channel receive
Output When HIGH, this signal denotes that the comms
channel receive buffer contains valid data waiting to
be read.
COMMTX
Communications
channel transmit
Output When HIGH, this signal denotes that the comms
channel transmit buffer is empty.
DBGACK
Debug acknowledge
Output When HIGH indicates that the processor is in debug
state.
DBGDEWPT
Data watchpoint
Input Asserted by external hardware to halt execution of
the processor for debug purposes. If HIGH at the end
of a data memory request cycle, it causes the
ARM926EJ-S processor to enter debug state.
DBGEN
Debug enable
Input Enables the debug features of the processor. This
signal must be tied LOW if debug is not required.
DBGEXT[1:0]
EmbeddedICE-RT
external input
Input Inputs to the EmbeddedICE-RT logic that enable
breakpoints or watchpoints to be dependent on
external conditions.
DBGIEBKPT
Instruction breakpoint
Input Asserted by external hardware to halt execution of
the processor for debug purposes. If HIGH at the end
of an instruction fetch, it causes the ARM926EJ-S
processor to enter debug state if that instruction
reaches the Execute stage of the processor pipeline.
DBGINSTREXEC
Instruction executed
Output Indicates that the instruction in the Execute stage of
the processor pipeline has been executed.
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