CS2100 Computer Organisation The Processor: Control (AY2015/6) Semester 1.

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Presentation transcript:

CS2100 Computer Organisation The Processor: Control (AY2015/6) Semester 1

CS2100 Generating ALUControl Signal OpcodeALUop Instruction Operation Funct field ALU action ALU control lwload wordadd swstore wordadd beqbranch equalsubtract R-typeadd R-typesubtract R-typeAND R-typeOR R-type set on less than  Control ALUcontrolFunction 0000 AND 0001 OR 0010 add 0110 subtract 0111 slt 1100 NOR Generation of 2-bit ALUop signal will be discussed later xxxxxx Instruction Type ALUop lw / sw 00 beq 01 R-type 10 25

Design of ALU Control Unit (1/2) Input: 6-bit Funct field and 2-bit ALUop Output: 4-bit ALUcontrol Find the simplified expressions CS2100 Control  ALUop Funct Field ( F[5:0] == Inst[5:0] ) ALU control MSBLSBF5F4F3F2F1F0 lw sw beq add sub and or slt 00 XXXXXX XXXXXX 01 XXXXXX X X X X X X X X X X X X X X X X ALUcontrol3 = 0 ALUcontrol2 = ? ALUop0 + ALUop1  F1 26

CS2100 Control Design: Outputs RegDstALUSrc MemTo Reg Reg Write Mem Read Mem Write Branch ALUop op1op0 R-type lw sw beq  Control XX XX