Digital-Logic-Design

(a) Assume that a CPU has only two registers R₁ and R₂ and that only the following instruction is available XOR R_i, R_j; {R_j ← R_i ⊕ R_j, for i,j = 1,2}
Using this XOR instruction, find an instruction sequence in order to exchange
the contents of the registers R₁ and R₂.

(b) The line p of the circuit shown in figure has stuck at 1 fault. Determine an input test to detect the fault.