MPC5604B/C Microcontroller Reference Manual, Rev. 8
820 Freescale Semiconductor
33.7.8.4 OTM Flow
Ownership trace messages are generated when the operating system writes to the e200z0h process ID
register or the memory mapped ownership trace register.
The following flow describes the OTM process:
1. The process ID register is a system control register. It is internal to the e200z0h processor and can
be accessed by using PPC instructions mtspr and mfspr. The contents of this register are replicated
on the pins of the processor and connected to Nexus.
2. OTR/process ID register reads do not cause ownership trace messages to be transmitted by the
NZ0H module.
3. If the periodic OTM message counter expires (after 255 queued messages without an OTM), an
OTM is sent using the latched data from the previous OTM or process ID register write.
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