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3.7.4. Operation with asynchronous TCK

You can use the ETM9 in systems that have a fully asynchronous TCK and CLK. All synchronization issues are taken care of in the ETM9. All groups of signals are synchronous to the relevant clock:

  • ARM9 interface CLK

  • Trace port CLK

  • JTAG port     TCK.

Slow system clock speeds

The ETM9 contains synchronizing D-types to synchronize between the TCK timing domain and the CLK timing domain. When the system clock speed is very slow, this synchronization time causes a delay of several cycles before you can disable tracing.

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