Below is a diagram of a simple cpu. For easy identification, all control signals are shown in red. Study the diagram and answer the following questions:

1. What is the purpose of the PC and IR registers?

2. Take a guess at the function of the Immed register.

3. Describe the possible sources for data stored in the register file (i.e., the inputs to the MUX whose output can be written to the register file).

4. Describe the various sources for data placed on the address bus (i.e., the inputs to the MUX whose output goes on the address bus).

address bus MUX sbus PC dous addrsel MU pcload pesel aluop ImmedPc PC Adder sregsel imload sbus RAM datain bus MUX Regs IR dwrite readwribe iload ALU dataout bus