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22.8.2.1 OTM Flow
Ownership trace messages are generated when the operating system (privileged supervisor
task) writes to the memory-mapped ownership trace register.
The following flow describes the OTM process.
1. The OT register is a memory-mapped register, whose address is located in the UBA.
The OT register address can be read from the UBA register by the IEEE-ISTO 5001
tool.
2. Only privileged writes (byte/half word or word) initiated by the RCPU to the OT
register that terminate normally are valid. The data value (word) written into the
register is formed into the ownership trace message that is queued to be
transmitted.
3. OT register reads and non-privileged OT register writes, or writes initiated by any
source other than the RCPU, do not cause ownership trace messages to be
transmitted by the READI module.
22.8.2.2 OTM Queueing
READI implements a queue 32 messages deep for program trace, data trace, and ownership
trace messages. Messages that enter the queue are transmitted via the output auxiliary port
in the order in which they are queued.
If multiple trace messages need to be queued at the same time,
ownership trace messages will have the lowest priority.
22.8.3
OTM Timing Diagrams
MCKO
MSEO
MDO[7:0]
TCODE = 2
Task/Process ID Tag = 0x87654321
MOTOROLA
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
NOTE
01000010 11001000 01010000 11011001
Figure 22-75. Ownership Trace Message
Chapter 22. READI Module
Ownership Trace
00100001 00000000
Don't care data
(idle clock)
22-81
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