The J-Trace Mictor 38 Adapter connects to the 38 pin Mictor connector. The pin out follows the single target connector pinout specification as defined in the ARM "ETM Architecture Specification". The adapter connects the GND, JTAG and some trace pins to their counterparts on the 19-pin Cortex-M connector.
Four trace data pins as well as the trace clock pin present on the Mictor connector are routed to the Cortex-M connector for trace. The 38-pin Mictor side of the adapter can be plugged either directly into the target side or via trace cable. The J-Trace side connects to J-Trace via half-pitch flat cable. Take a look at the J-Trace PRO Trace Probe for more infos on trace.