Nexus
MPC5566 Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor 25-51
NOTE
When DC[PTM] is set, direct branch messages are not transmitted. Instead,
each direct branch or predicated instruction toggles a bit in the history
buffer.
25.13.2.4 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 25-32. Resource Full Message Format
25.13.2.5 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 triggers a debug status message.
Debug status information is sent out in the following format:
Figure 25-33. Debug Status Message Format
TCODE (011011)
RCODE
(6 bits)
(4 bits)
Src. Proc.
(4 bits)
Max length = 46 bits; Min length = 15 bits
(1–32 bits)
RDATA
STATUS [31:24]
MSB LSB
12
SRC TCODE (000000)
3
6 bits4 bits8 bits
Fixed length = 18 bits
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