The register transfer statements for a register R and the memory in a computer are as follows (the X's are control functions that occur at random):

X'₃X₁: R←M[AR]             Read memory word into R

X'₁X₂: R←AC                   Transfer AC to R

X'₁X₃: M[AR]←R              Write R to memory

The memory has data inputs, data outputs, address inputs, and control inputs to read and write as in Fig. 2-12. Draw the hardware implementation of R and the memory in block diagram form. Show how the control functions X₁ through X₃ select the load control input of R, the select inputs of multiplexers that you include in the diagram, and the read and write inputs of the memory.

Fig. 2-12

k address lines Read Write n data input lines Memory unit 2k words n bits per word n data output lines