Consider a digital display system (DDS) that displays the contents of register X. A 16-bit code word is used to load a word in X, either from S or from R.

Question

Consider a digital display system (DDS) that displays the contents of register X. A 16-bit code word is used to load a word in X, either from S or from R. S is a 1024-word memory segment and R is a 32-word register file. The code word consists of a mode bit M, an S-address field, and an R-address field. The S-address field feeds block P, whose output addresses S; the R-address field feeds block Q, whose output addresses R. Based on the value of the mode bit M, block T selects either the word read from S or the word read from R to load into X.
Which one of the following represents the functionality of P, Q, and T?

Accepted Answer

C. P is 10:$2^{10}$ decoder; Q is 5:$2^{5}$ decoder; T is 2:1 multiplexer

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