4.3.3. Demultiplexed trace port (ETMv1.x and ETMv2.x only)

You can implement a wide (demultiplexed) trace port where it is important to reduce the switching rate to a minimum. This is achieved by clocking the trace port at half the processor operating frequency and routing trace port outputs to pairs of output pins. Use the PORTMODE signals to select demultiplexed trace port operation, see Main Control Register, ETMCR. For implementation details, see the appropriate ETM Technical Reference Manual.

Copyright © 1999-2002, 2004-2009, 2011 ARM Limited. All rights reserved.ARM IHI 0014Q