Debug and trace interface
The Arm debug and trace interface enables powerful software debug and optimization on an Arm® processor-based target system. It is based on the IEEE 1149.1 (JTAG) interface coupled with various additional signals. This chapter introduces these signals and describes their use within the interface.
Unless otherwise specified, all pull-up/pull-down resistors that are discussed in this chapter must be between 1K and 100K (10K is recommended).
Unless otherwise specified, any signals beginning with a lowercase 'n' are, by default, active-