TinyMicro control unit X66986

Design the control unit of the TinyMicro.

Specification

module control_unit (Instruction, Instruction_Address, EnA, EnB, Op, ReadWrite, MemConst, MemALU, Zero, Positive, Const, clk, rst); input [7:0] Instruction; output [5:0] Instruction_Address; output [1:0] Op; output [7:0] Const; output EnA, EnB, ReadWrite, MemConst, MemALU; input Zero, Positive; input clk, rst;

Input

• Instruction is the instruction coming from the instruction memory.
• Zero is the signal that is asserted when the zero condition for a jump is true.
• Positive is the signal that is asserted when the positive condition for a jump is true.
• clk is the clock signal of the circuit.
• rst is the reset signal of the circuit.

Output

• Instruction_Address is the address sent to the instruction memory (program counter).
• Op indicates the type of operation for ALU instructions.
• Const is the constant encoded in instruction register (sign-extended up to 8 bits).
• EnA and EnB are the signals that enable writing into registers RA ad RB, respectively.
• ReadWrite is the signal the indicates whether to read (0) from or write (1) into data memory.
• MemConst is the signal that controls the datapath multiplexer selecting between data memory (0) and constant from the instruction register (1).
• MemALU is the signal that controls the datapath multiplexer selecting between memory/constant (0) and the ALU output (1).