Consider the registers and ALU shown in Figure P6.22: 

The interpretation of various control points are summarized as follows:

Answer the following questions by writing suitable control word(s). Each control word must be specified according to the following format: C₄ C₃ C₂ C₁ C₀ For example:

(a) How will the A register be cleared? (Suggest at least two possible ways.) DIRECT CLEAR input is not available. 

(b) Suggest a sequence of control words that exchanges the contents of A and B registers (exchange means A ← B and B ← A).

Transcribed Image Text:

C Load B Load A 01 MUX R +-C ALU F 01 MUX S -C C C