USB TAP probe internal software overview

The loader software provides initial USB connectivity to the host, tools for reprogramming the USB TAP loader firmware, and the underlying software framework required to run the debugger.

When the USB TAP probe is first connected to the host USB port it runs the loader software. This is indicated by the red or green blinking heartbeat of the probe's TX/RX indicator light. To reprogram the loader image stored in the probe's flash EPROM, see Reprogramming USB TAP firmware image topic.

The USB TAP dispatcher software is basically transparent to the user, and is simply the application that tells the USB TAP probe how to control the target. It recognizes the specific target processor and debug port interface, and carries out the instructions of the debugger.