2.11.3.3 TAP Controller

The TAP Controller is compliant with the IEEE Standard 1149.1. It is a state machine of 16 states that controls the Instruction Register (IR) and the Data Registers (such as BSR, IDCODE, USRCODE, BYPASS, and so on.). The TAP Controller steps into one of the states depending on the sequence of TMS at the rising edges of TCK.