NXP Semiconductors MPC5566 - Data Trace Synchronization Messages

Nexus
MPC5566 Microcontroller Reference Manual, Rev. 2
25-88 Freescale Semiconductor
Error information is messaged out in the following format:
Figure 25-67. Error Message Format
25.17.5.3.3 Data Trace Synchronization Messages
A data trace write/read w/ sync. message is messaged via the auxiliary port (provided data trace is enabled)
for the following conditions (refer to Table 25-59):
• Initial data trace message upon exit from system reset or whenever data trace is enabled is a
synchronization message.
• Upon returning from a low power state, the first data trace message is a synchronization message.
• Upon returning from debug mode, the first data trace message is a synchronization message.
• After occurrence of queue overrun (can be caused by any trace message), the first data trace
message is a synchronization message.
• After the periodic data trace counter has expired indicating 255 without-sync data trace messages
have occurred since the last with-sync message occurred.
• Upon assertion of the Event In (EVTI) pin, the first data trace message is a synchronization
message if the eic bits of the dc register have enabled this feature.
• Upon data trace write/read after the previous dtm message was lost due to an attempted access to
a secure memory location.
• Upon data trace write/read after the previous dtm message was lost due to a collision entering the
fifo between the dtm message and any of the following: error message, or watchpoint message.
Data trace synchronization messages provide the full address (without leading zeros) and insure that
development tools fully synchronize with data trace regularly. Synchronization messages provide a
reference address for subsequent DTMs, in which only the unique portion of the data trace address is
transmitted. The format for data trace write/read w/ sync. messages is as follows:
Figure 25-68. Data Write/Read w/ Sync Message Format
ECODE (00010 / 01000)
MSB LSB
12
SRC TCODE (001000)
3
6 bits4 bits5 bits
Fixed length = 15 bits
DATA
MSB LSB
234
F-ADDR DSZ SRC
5
4 bits
1
TCODE (001101 or 001110)
3 bits1–32 bits1–64 bits 6 bits
Max length = 109 bits; Min length = 15 bits