Joint Test Action Group (JTAG)
JTAG (Joint Test Action Group) is often used to program and debug microcontrollers, embedded systems, FPGAs, and much more. It has a wide range of capabilities and is supported by a large amount of hardware. It's extremely flexible and can be used for many other purposes. When using the JTAG analyzer, make sure you are sampling at least 4 times faster than the clock speed to accurately capture the data.
Top Resources
What Logic Decodes
TAP state machine states
Data from TDI data line
Data from TDO data line
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