Nexus
MPC5565 Microcontroller Reference Manual, Rev. 1.0
24-52
Freescale Semiconductor
24.11.12.2.3 Direct Branch Messages (Traditional)
Direct branches (conditional or unconditional) are all taken branches whose destination is fixed in the
instruction opcode. Direct branch information is messaged out in the following format:
Figure 24-31. Direct Branch Message Format
NOTE
When DC[PTM] is set, direct branch messages will not be transmitted.
Instead, each direct branch or predicated instruction will toggle a bit in the
history buffer.
24.11.12.2.4 Resource Full Messages
The resource full message is used in conjunction with the branch history messages. The resource full
message is generated when the internal branch/predicate history buffer is full, or if the BTM Instruction
sequence counter (I-CNT) overflows. If synchronization is needed at the time this message is generated,
the synchronization is delayed until the next branch trace message that is not a resource full message.
The current value of the history buffer is transmitted as part of the resource full message. This information
can be concatenated by the tool with the branch/predicate history information from subsequent messages
to obtain the complete branch history for a message. The internal history value is reset by this message,
and the I-CNT value is reset as a result of a bit being added to the history buffer.
Figure 24-32. Resource Full Message Format
24.11.12.2.5 Debug Status Messages
NOTE
Debug Status Messages (DSMs) are enabled if the Nexus module is enabled.
Debug status messages report low power mode and debug status. Entering/exiting debug mode as well as
entering a low power mode will trigger a debug status message.
I-CNT
MSB
LSB
1
2
SRC
TCODE (000011)
3
6 bits
4 bits
1-8 bits
Max length = 18 bits; Min length = 11 bits
TCODE (011011)
RCODE
(6 bits)
(4 bits)
Src. Proc.
(4 bits)
Max length = 46 bits; Min length = 15 bits
(1-32 bits)
RDATA
Summary of Contents for MPC5565
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