CSE 2021 COMPUTER ORGANIZATION
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1 CSE 2021 COMPUTER ORGANIZATION HUGH LAS CHESSER 1012U HUGH CHESSER CSEB 1012U W10-M
2 Agenda Topics: 1. Multiple cycle implementation review 2. State Machine 3. Control Unit implementation for Multi-cycle core Patterson: Section 4.5, Appendix C Reminder: Quiz #2 Wednesday (November 7) W10-M 2
3 Breaking the Instruction Execution into Clock Cycles Execution of each instruction is broken into a series of steps Each step is balanced to do almost equal amount of work Each step takes one clock cycle Each step contains at the most 1 ALU operation, or 1 register file access, or 1 memory access Operations listed in 1 step occurs in parallel in 1 clock cycle Different steps occur in different clock cycles Different steps are: 1. IF: Instruction fetch step 2. ID: Instruction decode and register fetch step 3. EX: Execution, memory address computation, or branch completion step 4. MEM: Memory access of R-type instruction completion step 5. WB: Write back completion step W10-M 3
4 Multicycle Implementation: Control Units added W10-M 4
5 Action of 2-bit Control Signals Control Input ALUOp ALUSrcB Value Effect 00 ALU performs an add operation 01 ALU performs a subtract operation 10 The function field of Instruction defines the operation of ALU 00 The second operand of ALU comes from Register B 01 The second operand of ALU = 4 10 The second operand of ALU is sign extended Instruction[15-0] 11 The second operand of ALU is sign extended, 2-bit left shifted Instruction[15-0] PCSource 00 Output of ALU (PC + 4) is sent to PC 01 Contents of ALUOut (branch target address = PC x offset) is sent to PC 10 Contents of Instruction[25-0], shift left by 2, and concatenated with the MSB 4- bits of PC is sent to PC (jump instruction) W10-M 5
6 Action of 1-bit Control Signals Control Input Effect when Deasserted (0) Effect when asserted (1) IorD PC supplies address to memory (instruction fetch) ALUout supplies address to memory (lw/sw) MemRead None Memory content specified by address is placed on Memdata o/p (lw/any instruction) MemWrite None I/p Write data is stored at specified address (sw) IRWrite None MemData o/p is written on IR (instruction fetch) RegDst RegWrite Write Register specified by Instruction[20-16] (lw) None WriteRegister specified by Instruction[15-11] (Rtype) Data from WriteData i/p is written on the register specified by WriteRegister number ALUSrcA PC is the first operand in ALU (increment PC) Register A is the first operand in ALU MemtoReg WriteData of the register file comes from ALUOut WriteData of the register file comes from MDR PCWrite PCWriteCond Operation at PC depends on PCWriteCond and zero output of ALU Operation at PC depends on PCWrite PC is written; Source is determined by PCSource PC is written if zero o/p of ALU = 1; Source is determined by PCSource W10-M 6
7 Summary of Steps used in different Instructions Step Name IF - Instruction fetch ID - Instruction decode / Register fetch EX R-type Execution / address comp. / Branch /Jump MEM - Memory Access / R-type Completion WB - Memory Read Completion R-type Instruction ALUOut=A op B Reg[IR[15-11]] = ALUOut; Memory Reference Instruction Action for IR = Memory[PC]; PC = PC + 4; Branch A = Reg[IR[25-21]]; B = Reg[IR[20-16]]; ALUOut = PC + (sign-extend(ir[15-0])<<2); ALUOut = A + signextend(ir[15-0]) lw: MDR = Memory[ALUOut] or sw: Memory[ALUOut] = B lw: Reg[IR[20-16]]=MDR; if(a == B) then PC = ALUOut; Jump PC = PC[31-28] (IR[25-0)<<2); W11-M 7
8 Multipath Datapath Implementation: Control Recall that design of single cycle datapath was based on a combinational circuit Design of multicycle datapath is more complicated 1. Instructions are executed in a series of steps 2. Each step must occur in a sequence 3. Control of multicycle must specify both the control signals and the next step The control of a multicycle datapath is based on a sequential circuit referred to as a finite state machine State 0 A finite state diagram for a 2-bit counter Each state specifies a set of outputs By default, unspecified outputs are assumed disabled The number of the arrows identify inputs 00 State State 3 10 W11-M 8 State 2
9 Finite State Machine? See Appendix C A sequential logic function which has a state and inputs the logic function determines the next state and outputs Moore machine outputs depend on just the current state Mealy machine outputs depend on current state and inputs Book uses Moore machine description W11-M 9
10 Finite State Machine Control of Multicycle Datapath (1) Start Instruction fetch/decode and register fetch (Figure 4.36) Memory access Instructions (Figure 4.20) R-type instructions Figure (4.19) Branch instruction (Figure 4.21) Jump instruction (Figure 4.24) High-Level View W11-M 10
11 Finite State Machine Control of Multicycle Datapath (2) Start 0 Instruction fetch MemRead ALUSrcA = 0 IorD = 0 IRWrite ALUSrcB = 01 ALUOp = 00 PCWrite PCSource = 00 Instruction decode/ Register fetch 1 ALUSrcA = 0 ALUSrcB = 11 ALUOp = 00 (Op = 'LW') or (Op = 'SW') (Op = R-type) (Op = 'BEQ') (Op = 'JMP') Memory reference FSM R-type FSM Branch FSM Jump FSM Fig. D.3.1: Steps 1 and 2: Instruction Fetch and Decode Instructions W11-M 11
12 Finite State Machine Control of Multicycle Datapath (3) From state 1 2 (Op = 'lw') or (Op = 'sw') Memory address computation ALUSrcA = 1 ALUSrcB = 10 ALUOp = 00 Finite State Machine for Memory Reference Instructions (Op = 'lw') Memory access (Op = 'sw') Memory access 3 5 MemRead IorD = 1 MemWrite IorD = 1 Write-back step 4 RegWrite MemtoReg = 1 RegDst = 0 To state 0 W11-M 12
13 Finite State Machine Control of Multicycle Datapath (4) 6 From state 1 (Op = R-type) Execution ALUSrcA = 1 ALUSrcB = 00 ALUOp = 10 7 RegDst = 1 RegWrite Memto Reg = 0 R-type completion To state 0 Finite State Machines for R-type Instructions W11-M 13
14 Finite State Machine Control of Multicycle Datapath (5) From state 1 (Op = 'beq') From state 1 (Op = 'j') 8 ALUSrcA = 1 ALUSrcB = 00 ALUOp = 01 PCWriteCond PCSource = 01 Branch completion 9 PCWrite PCSource = 10 Jump completion To state 0 To state 0 Finite State Machine for Branch Instruction Finite State Machine for Jump Instruction W11-M 14
15 2 Memory address computation ALUSrcA = 1 ALUSrcB = 10 ALUOp = 00 Start (Op = 'lw' or 'sw') Execution Instruction fetch 0 MemRead = 1 ALUSrcA = 0 1 IorD = 0 IRWrite ALUSrcB = 01 ALUOp = 00 PCWrite = 1 PCSource = 00 6 ALUSrcA = 1 ALUSrcB = 00 ALUOp = 10 (Op = R-type) 8 Branch completion ALUSrcA = 1 ALUSrcB = 00 ALUOp = 01 PCWriteCond = 1 PCSource = 01 (Op = 'beq') 9 Instruction decode/ register fetch ALUSrcA = 0 ALUSrcB = 11 ALUOp = 00 (Op = 'j') Jump completion PCWrite = 1 PCSource = 10 3 (Op = 'lw') Memory access MemRead = 1 IorD = 1 5 (OP = 'sw') Memory access MemWrite = 1 IorD = 1 7 RegDst = 1 RegWrite = 1 MemtoReg = 0 R-type completion 4 Write-back step RegDst = 0 RegWrite = 1 MemtoReg = 1 W11-M 15
16 Finite State Machine Control of Multicycle Datapath (5) Outputs Control logic Inputs W11-M 16
17 Control Logic Truth Table Note that control outputs depend only on current state (Op column is blank for all output rows) Next state depends on current state and inputs (opcode from instruction) W11-M 17
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