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What does AAU stand for?

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What does AAU stand for?

(a) arithmetic address unit

(b) address arithmetic unit

(c) address access unit

(d) arithmetic access unit

This question was addressed to me during a job interview.

Query is from Examples of Embedded System Digital Signal Processing in division Embedded Processors of Embedded Systems

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Right answer is (b) address arithmetic unit

For explanation I would say: DSP56000 possess two external bus switches in which one is for data and the other is for the address for communicating with the outside world and these two switches are reproduced by the internal data bus and AAU.

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