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For MEMR(active low) and MEMWR(active low) operations the mode of isolation buffer should respectively be in

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For MEMR(active low) and MEMWR(active low) operations the mode of isolation buffer should respectively be in

(a) receiver mode, receiver mode

(b) transmit mode, receiver mode

(c) receiver mode, transmit mode

(d) transmit mode, transmit mode

This question was posed to me in an international level competition.

This intriguing question originated from Design of a PC Based Multimicroprocessor System in portion Multimicroprocessor Systems of Microprocessor

1 Answer

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by (49.2k points)
Right answer is (c) receiver mode, transmit mode

Explanation: During MEMR(active low) the data flow from memory to CPU so isolation buffer should be in receiver mode and data flows from CPU to memory during MEMWR(active low) operation and so buffer should be in transmit mode.

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