![]() ![]() BSR, IDCODES, BYPASS) depends on the value loaded into the instruction register.įor more detail on each state, refer to the IEEE 1149.1 Standard JTAG document. The two main paths allow for setting or retrieving information from either a data register or the instruction register of the device. Figure 2, below, shows the state-transition diagram.Īll states have two exits, so all transitions can be controlled by the single TMS signal sampled on TCK. The TAP controller, a state machine whose transitions are controlled by the TMS signal, controls the behaviour of the JTAG system. ![]() The file contains details of the Boundary Scan configuration for the device. This information allows the device to be linked to its Boundary Scan Description Language (BSDL) file.
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