ETMv3 Trace Port Mode

Specify the Port speed:ETM clock speed ratio. This enables the trace port to run at a different speed to that of the core. Select the require ratio from the drop-down list.

Available options are:

• Dynamic (for use with on-chip trace buffers). Select this option if you are using ETB 11.

• 1:1 (the port speed is the same as the ETM clock speed).

• 1:2 (the port speed is half the ETM clock speed).

• 1:3 (the port speed is one third of the ETM clock speed).

• 1:4 (the port speed is one quarter of the ETM clock speed).

• 2:1 (the port speed is double the ETM clock speed).

• Implementation defined (defined by the ASIC manufacturer).

  The Port speed:ETM clock speed ratio defines the rate of the trace port, not the trace clock speed. The trace clock speed is always half the trace port rate, because half-rate clocking is always enabled for ETMv3.

For all ETM architectures:

Half-rate clocking enabled   Select this option if you want to set the ETM half-rate clocking signal. The effect of this signal is dependent on the implementation of your system.

 See the ETM control register section of the ARM Embedded Trace Macrocell Specification.

Disabled traceport                 Select this option if you want to suppress the output from the trace port. Use this to control trace output if your hardware has two or more ETMs sharing a single trace port.Type topic text here.