Front Panel Unit (FPU)

The Front Panel Unit (FPU) contains the necessary connectors, switches,

logic, and LED indicators for the Front Panel. For every type of Trusted I/O

Module, the FPU contains the Slice Healthy, Active/Standby, the Educated

LED indicators, and the Module removal switches. Additional bicolor LEDs

provide status indication for the individual I/O signals. Serial data interfaces

connect the FPU to each of the HIU slices to control the LED status indicators

and monitor the Module removal switches.