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Which of the following allows access to all the hardware within the system?

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Which of the following allows access to all the hardware within the system?

(a) debugger

(b) JTAG

(c) onboard debugger

(d) simulator

The question was posed to me in a national level competition.

I want to ask this question from Emulation Techniques topic in division Emulation and Debugging Techniques of Embedded Systems

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Right answer is (b) JTAG

To explain: The JTAG can access all the hardware within the system. They provide a way of taking over the pins of a device and allows the different bit patterns to be imposed on the pins which allow other circuits to be tested with the imposed pins.

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