comp 180 Lecture 25 Outline of Lecture The ALU Control Operation & Design The Datapath Control Operation & Design HKUST 1 Computer Science
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1 Outline of Lecture The Control Operation & Design The Datapath Control Operation & Design HKST 1 Computer Science
2 Control After the design of partial single IPS datapath, we need to add the control unit that controls the whole operation of the datapath (generatse appropriate signals for the operation of the datapath). From the previous chapter - when we designed the - these are the control signals that we came up with: Control lines Function 0 00 AND 0 01 OR 0 10 ADD 1 10 SB 1 11 SLT For load and store, we need to calculate the memory address by addition. For R-type instructions, the needs to perform one of five operations (Subtract, add, AND, OR, SLT) - depending on the value of the 6-bit funct filed. HKST 2 Computer Science
3 Control For branch subtraction. equal, the must perform a By using the function field (6 bits for IPS), the table above can be expanded to cover a wider range of instructions. Instruction opcode Op Instruction operation Function code Desired action control input LW 00 load word add 010 SW 00 store word add 010 Branch equal 01 branch equal subtract 110 R-type 10 add add 010 R-type 10 subtract subtract 110 R-type 10 AND and 000 R-type 10 OR or 001 R-type 10 SLT slt 111 HKST 3 Computer Science
4 In order to design the logic for this control unit, we create a truth table. The input of the truth table is a 2-bit Op and a 6-bit Function code, and the output is a 3-bit control signals Op Function code Operation Op1 Op2 F5 F4 F3 F2 F1 F HKST 4 Computer Science
5 sing the above truth table, we can design the control unit: Op Control Block Op0 Op1 Operation2 F3 F2 Operation1 Operation F(5-0) F1 Operation0 F0 HKST 5 Computer Science
6 Adding the control unit to the Datapath 4 Add Add PC address Instruction [31-0] Shift left 2 PCSrc Instruction memory [15-11] [25-21] [20-16] RegDst register 1 register 2 register data Reg Registers data 1 data 2 Src Zero address address Data memory data em emtoreg data [15-0] 16 sign extend 32 [5-0] control Op em HKST 6 Computer Science
7 The function of each of the control signals in the datapath is given in the following table: Signal name Effect when deasserted Effect when asserted em None Data memory contents at the read address are put on read data output em None Data memory contents at address given by write address is replaced by value on write data input Src The second operand comes from the second register file output RegDst The register destination number for the write register comes from the rt field The second operand is the sign-extended lower 16-bits of the instruction The register destination number for the write register comes from the rd field Reg None The register on the write register input is written into with the value on the write data input PCSrc emtoreg The PC is replaced by the output of the adder that computes the value of PC+4 The Value fed to the register write data input comes from the The PC is replaced by the output of the adder that computes the branch target The value fed to the register write data input comes from the data memory The control signals can be set by the datapath control unit based only on the opcode field of the instruction. HKST 7 Computer Science
8 The only exception is the PCSrc control line. It should be set if the instruction is a branch on equal and the Zero output of the is true. To generate the PRSrc signal, we will AND toegther a signal from the control unit, called branch, with the Zero signal out of the. The Whole Datapath including all the control signals will be as follows: HKST 8 Computer Science
9 4 Add Add PC address Instruction [31-0] [31-26] Shift left 2 PCSrc Instruction memory Control [15-11] [25-21] [20-16] RegDst register 1 register 2 register data Reg Registers data 1 data 2 Src Zero address address Data memory data em data emtoreg [15-0] 16 sign extend 32 [5-0] control Op em HKST 9 Computer Science
10 The logic circuits for the datapath control unit. The setting of the control lines is completely determined by the opcode fields of the instruction. Instructio n Reg Dst Src emto Reg Reg em em Branch Op1 Op2 R-format lw sw beq The input to the datapath control unit: Name Opcode in decimal Opcode in binary Op5 Op4 Op3 Op2 Op1 Op0 R-format lw sw beq HKST 10 Computer Science
11 Truth Table of the Datapath Control nit R-format lw sw beq Op Op Inputs Op Op Op Op RegDst 1 0 Src emtoreg 0 1 Outputs Reg em em Branch Op Op HKST 11 Computer Science
12 Implementation We can easily implement the above truth table using simple gates. If we used all possible instructions, then a PLA would be more appropriate. Inputs Op5 Op4 Op3 Op2 Op1 Op0 Outputs R-foramt lw sw beq RegDst Src emtoreg Reg em em Branch Op1 Op0 HKST 12 Computer Science
13 Further ing Chapter 5 & Appendix B. David A. Patterson and John L. Hennessy. Computer Organization & Design: The Hardware / Software Interface. organ Kaufman Publishers, 1998 (page ). HKST 13 Computer Science
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