Self-testing integrated circuit has switch which selectively provides either output signal of test access port or output signal of command decoder to shift register

摘要

A command decoder (60) stores system command data received through input port, in control register (61) and outputs command data through output port (80). A switch (50) selectively provides either output signal of test access port (TAP) (20) or output signal of decoder into shift register (30). The shift register shifts the received data and outputs shifted data. An Independent claim is also included for method for evaluating integrated circuit in system environment.