The PORTMODE output bus provides a copy of the contents of bits [17:16] of the ETM control register. PORTMODE enables the trace debug tools to configure how the trace port signals from the ETM (PIPESTATA, PIPESTATB, TRACEPKTA, and TRACEPKTB) are mapped onto the trace port pins of the ASIC. The following modes of operation are supported:

In each mode, both normal and half-rate clocking are supported. The clocking mode is controlled by CLKDIVTWOEN (this is a copy of ETM control register bit 13).

Normal and demultiplexed modes are supported directly on ETM10. Multiplexed mode is not supported directly by ETM10, because it is unlikely that the system speed will be slow enough for it to be used. You can implement multiplexed mode with logic external to ETM10 in the same way as for ETM9 (see the ETM9 Technical Reference Manual for details).