PALMiCE2H ARM is a JTAG emulator that supports a range of ARM cores including ARM7/9/11 and Cortex. JTAG model, which allows faster processing of various tasks, and ETM model, which allows by-second tracing with ETM by large-capacity tracing memory incorporated besides faster processing, are available. In ETM model, it made backward execution and back step that are not possible in ordinary execution possible by analyzing the traced contents and thereby retrieving register and memory contents to allow pseudo replication of CPU execution (Trace-back feature*1). Furthermore, Transition Window is available for viewing switching by function unit so that the contents taken into trace can be understood as a whole. When Linux is used, switching can be viewed by process unit. It allows to grasp the kernel and process operation flow easily. Debugging efficiency can be improved by capturing bug into large-capacity tracing memory, narrowing the suspected bug range down in Transition Window, and identifying the bug root by using trace-back feature. *1 Trace-back feature is optional.