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The LOCK (active low) is activated automatically by hardware using

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in Microprocessor by (39.4k points)
The LOCK (active low) is activated automatically by hardware using

(a) XCHG signal

(b) Interrupt acknowledge

(c) Descriptor table access

(d) All of the mentioned

The question was posed to me in quiz.

My doubt stems from Signal Descriptions of 80286 topic in chapter 80286-80287-A Microprocessor with Memory Management and Protection of Microprocessor

1 Answer

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by (49.2k points)
The correct option is (d) All of the mentioned

Easiest explanation: The lock pin is used to prevent the other masters from gaining the control of the bus, for the current and the following bus cycles. This pin is activated by a “LOCK” instruction prefix, or automatically by hardware during XCHG, interrupt acknowledge or descriptor table access.

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