What is JTAG?

What is JTAG? Introduction JTAG, or the Joint Test Action Group, is a standard protocol used for testing and debugging digital circuits. It is a powerful tool that allows engineers to perform various tasks such as testing and verifying circuit functionality, debugging hardware, and programming FPGAs and microcontrollers. JTAG was developed in the late 1980s as an industry-standard for boundary-scan testing. It is a standard interface used to access the embedded hardware of a device for testing, debugging, and programming. The JTAG standard defines a standard set of pins and their functions, making it possible to test and program chips from different vendors using a common interface.   One of the key benefits of JTAG is that it provides access to the internal circuitry of a device without the need for additional hardware such as a test probe or emulator. This is possible because JTAG uses a series of test access ports (TAPs) that are built into a device's boundary-scan ar...