Problem
Extend the SRC instruction set by adding the x or command, (op = 19), which is similar to the and command, but performs the XOR operation instead of AND.
a. Develop the abstract RTN for the x or command.
b. Write the concrete RTN and control signals for the x or instruction for the 1-bus SRC microarchitecture. (Unfortunately, the SRC ALU does not have the XOR operation as one of its primitives, but only the operations ADD, SUB, AND, OR, SHR, SHL, NEG, NOT, C = B, and INC4.) ($4A) 4.4 Write concrete RTN steps and control sequences for the brl instruction implemented in the I-bus microarchitecture.