Nexus
MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor
24-53
Debug status information is sent out in the following format:
Figure 24-33. Debug Status Message Format
24.11.12.2.6 Program Correlation Messages
Program correlation messages are used to correlate events to the program flow that may not be associated
with the instruction stream. To maintain accurate instruction tracing information when entering debug
mode or a CPU low power mode (where tracing may be disabled), this message is sent upon entry into one
of these two modes and includes the instruction count and branch history. Program correlation is messaged
out in the following format:
Figure 24-34. Program Correlation Message Format
24.11.12.2.7
BTM Overflow Error Messages
An error message occurs when a new message cannot be queued due to the message queue being full. The
FIFO will discard incoming messages until it has completely emptied the queue. After it is emptied, an
error message will be queued. The error encoding will indicate which types of messages attempted to be
queued while the FIFO was being emptied.
If only a program trace message attempts to enter the queue while it is being emptied, the error message
will incorporate the program trace only error encoding (00001). If both OTM and program trace messages
attempt to enter the queue, the error message will incorporate the OTM and program trace error encoding
(00111). If a watchpoint also attempts to be queued while the FIFO is being emptied, then the error
message will incorporate error encoding (01000).
NOTE
The OVC bits within the DC1 register can be set to delay the CPU to
alleviate (but not eliminate) potential overrun situations.
STATUS [31:24]
MSB
LSB
1
2
SRC
TCODE (000000)
3
6 bits
4 bits
8 bits
Fixed length = 18 bits
HIST
MSB
LSB
2
3
4
I-CNT
EVCODE
SRC
5
4 bits
1
TCODE (100001)
4 bits
1-8 bits
1-32 bits
6 bits
Max length = 54 bits; Min length = 16 bits
Содержание MPC5565
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