Intel® System Debugger - System Debug User and Reference Guide
User and Reference Guide
Reliable Target Connection
With a reliable target connection, the signaling requirements of JTAG are met, and communication at the JTAG protocol level is possible. Additionally, there may be sideband signals that are not part of the generic JTAG spec but are required for debugging Intel® processors. Specific requirements for each platform are described in the "Debug Port Design Guide" available from Intel.