Nexus
MPC5566 Microcontroller Reference Manual, Rev. 2
25-50 Freescale Semiconductor
25.13.2 BTM Message Formats
The e200z6 Nexus3 module supports three types of traditional BTM messages—direct, indirect, and
synchronization messages. It supports two types of branch history BTM messages—indirect branch
history, and indirect branch history with synchronization messages. Debug status messages and error
messages are also supported.
25.13.2.1 Indirect Branch Messages (History)
Indirect branches include all taken branches whose destination is determined at run time, interrupts and
exceptions. If DC[PTM] is set, indirect branch information is messaged out in the following format:
Figure 25-29. Indirect Branch Message (History) Format
25.13.2.2 Indirect Branch Messages (Traditional)
If DC[PTM] is cleared, indirect branch information is messaged out in the following format:
Figure 25-30. Indirect Branch Message Format
25.13.2.3 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 25-31. Direct Branch Message Format
HIST
MSB LSB
234
U-ADDR I-CNT SRC
5
4 bits
1
TCODE (011100)
1–8 bits1–32 bits1–32 bits 6 bits
Max length = 82 bits; Min length = 13 bits
msb LSB
234
U-ADDR I-CNT SRC
4 bits
1
TCODE (000100)
1–8 bits1–32 bits 6 bits
Max length = 50 bits; Min length = 12 bits
I-CNT
MSB LSB
12
SRC TCODE (000011)
3
6 bits4 bits1–8 bits
Max length = 18 bits; Min length = 11 bits
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