We are planning on using ETM to aid in debugging but have found very few routing guidelines for the TRACE_D[0:3] and TRACE_CLK nets.
On the K22FX512, using a 120MHz core speed, What is:
- The clock speed of the TRACE nets? Datasheet says the interface is limited to 50MHz but offers no guidance for determining the speed.
- Is any particular characteristic impedance for the traces necessary?
- Do the lines need to be length-matched?
Design guild-lines seem to be largely unavailable and the Kinetis datasheets are light on details for this particular functionality. Any help is appreciated. Thanks!