RISC Architecture: Multi-Cycle Implementation
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1 RISC Architecture: Multi-Cycle Implementation Virendra Singh Associate Professor Computer Architecture and Dependable Systems Lab Department of Electrical Engineering Indian Institute of Technology Bombay Computer Organization & Architecture Lecture 14 (19 April 2013)
2 Example Processor MIPS subset MIPS Instruc,on Subset v Arithme,c and Logical Instruc,ons Ø add, sub, or, and, slt v Memory reference Instruc,ons Ø lw, sw v Branch Ø beq, j 16 Apr 2013 Computer Architecture@IIT Mandi 2
3 Multicycle Datapath PCSource IorD out MUX in1 PCWrite etc. PC in2 control Data Addr. Memory to Control FSM Instr. reg. (IR) IRWrite Mem. Data (MDR) Register file RegDst RegWrite B Reg. A Reg. ALUSrcA ALUSrcB Shift left ALU ALUOut Reg. MemRead MemWrite MemtoReg Sign extend Shift left 2 ALU control ALUOp 16 Apr 2013 Computer Architecture@IIT Mandi 3
4 3 to 5 Cycles for an Instruction Step R-type Mem. Ref. Branch type J-type (4 cycles) (4 or 5 cycles) (3 cycles) (3 cycles) Instruc(on fetch IR Memory[PC]; PC PC+4 Instr. decode/ Reg. fetch Execu(on, addr. Comp., branch & jump comple(on ALUOut A op B A Reg(IR[21-25]); B Reg(IR[16-20]) ALUOut PC + (sign extend IR[0-15]) << 2 ALUOut A+sign extend (IR[0-15]) If (A= =B) then PC ALUOut PC PC[28-3 1] (IR[0-25]<<2) Mem. Access or R- type comple(on Memory read comple(on Reg(IR[11-1 5]) ALUOut MDR M[ALUout] or M[ALUOut] B Reg(IR[16-20]) MDR 16 Apr 2013 Computer Architecture@IIT Mandi 4
5 Cycle 1 of 5: Instruction Fetch (IF) Read instruc,on into IR, M[PC] IR Control signals used:» IorD = 0 select PC» MemRead = 1 read memory» IRWrite = 1 write IR Increment PC, PC + 4 PC Control signals used:» ALUSrcA = 0 select PC into ALU» ALUSrcB = 01 select constant 4» ALUOp = 00 ALU adds» PCSource = 00 select ALU output» PCWrite = 1 write PC 16 Apr 2013 Computer Architecture@IIT Mandi 5
6 Cycle 2 of 5: Instruction Decode (ID) R I J opcode reg 1 reg 2 reg 3 shamt fncode opcode reg 1 reg 2 word address increment opcode word address jump Control unit decodes instruc,on Datapath prepares for execu,on R and I types, reg 1 A reg, reg 2 B reg» No control signals needed Branch type, compute branch address in ALUOut» ALUSrcA = 0 select PC into ALU» ALUSrcB = 11 Instr. Bits 0-15 shi` 2 into ALU» ALUOp = 00 ALU adds 16 Apr 2013 Computer Architecture@IIT Mandi 6
7 Cycle 3 of 5: Execute (EX) R type: execute func,on on reg A and reg B, result in ALUOut Control signals used:» ALUSrcA = 1 A reg into ALU» ALUsrcB = 00 B reg into ALU» ALUOp = 10 instr. Bits 0-5 control ALU I type, lw or sw: compute memory address in ALUOut A reg + sign extend IR[0-15] Control signals used:» ALUSrcA = 1 A reg into ALU» ALUSrcB = 10 Instr. Bits 0-15 into ALU» ALUOp = 00 ALU adds 16 Apr 2013 Computer Architecture@IIT Mandi 7
8 Cycle 3 of 5: Execute (EX) I type, beq: subtract reg A and reg B, write ALUOut to PC Control signals used:» ALUSrcA = 1 A reg into ALU» ALUsrcB = 00 B reg into ALU» ALUOp = 01 ALU subtracts» If zero = 1, PCSource = 01 ALUOut to PC» If zero = 1, PCwriteCond = 1 write PC» Instruc(on complete, go to IF J type: write jump address to PC IR[0-25] shi` 2 and four leading bits of PC Control signals used:» PCSource = 10» PCWrite = 1 write PC» Instruc(on complete, go to IF 16 Apr 2013 Computer Architecture@IIT Mandi 8
9 Cycle 4 of 5: Reg Write/Memory R type, write des,na,on register from ALUOut Control signals used:» RegDst = 1 Instr. Bits specify reg.» MemtoReg = 0 ALUOut into reg.» RegWrite = 1 write register» Instruc(on complete, go to IF I type, lw: read M[ALUOut] into MDR Control signals used:» IorD = 1 select ALUOut into mem adr.» MemRead = 1 read memory to MDR I type, sw: write M[ALUOut] from B reg Control signals used:» IorD = 1 select ALUOut into mem adr.» MemWrite = 1 write memory» Instruc(on complete, go to IF 16 Apr 2013 Computer Architecture@IIT Mandi 9
10 Cycle 5 of 5: Reg Write I type, lw: write MDR to reg[ir(16-20)] Control signals used:» RegDst = 0 instr. Bits are write reg» MemtoReg = 1 MDR to reg file write input» RegWrite = 1 read memory to MDR» Instruc(on complete, go to IF For an alternative method of designing datapath, see N. Tredennick, Microprocessor Logic Design, the Flowchart Method, Digital Press, Apr 2013 Computer Architecture@IIT Mandi 10
11 Control FSM 3 State 0 2 Instr. fetch/ adv. PC Start 1 Instr. decode/reg. fetch/branch addr. R B J Read memory data Write register lw 4 5 Compute memory addr. sw Write memory data 6 7 ALU operation Write register Write PC on branch condition 8 9 Write jump addr. to PC 16 Apr 2013 Computer Architecture@IIT Mandi 11
12 Control FSM (Controller) 6 inputs (opcode) Combinational logic 16 control outputs Present state Next state Reset Clock FF FF FF FF 16 Apr 2013 Computer Architecture@IIT Mandi 12
13 Designing the Control FSM Encode states; need 4 bits for 10 states, e.g., State 0 is 0000, state 1 is 0001, and so on. Write a truth table for combina,onal logic: Opcode Present state Control signals Next state Synthesize a logic circuit from the truth table. Connect four flip- flops between the next state outputs and present state inputs. 16 Apr 2013 Computer Architecture@IIT Mandi 13
14 Block Diagram of a Processor MemWrite MemRead Controller (Control FSM) ALUOp 2-bits ALU control Opcode 6-bits zero Overflow ALUSrcA ALUSrcB 2-bits PCSource 2-bits RegDst RegWrite MemtoReg IorD IRWrite PCWrite PCWriteCond funct. [0,5] ALUOp 3-bits Reset Clock Mem. Addr. Datapath (PC, register file, registers, ALU) Mem. write data Mem. data out 16 Apr 2013 Computer Architecture@IIT Mandi 14
15 Exceptions or Interrupts Condi,ons under which the processor may produce incorrect result or may hang. Illegal or undefined opcode. Arithme,c overflow, divide by zero, etc. Out of bounds memory address. EPC: 32- bit register holds the affected instruc,on address. Cause: 32- bit register holds an encoded excep,on type. For example, 0 for undefined instruc,on 1 for arithme,c overflow 16 Apr 2013 Computer Architecture@IIT Mandi 15
16 Implementing Exceptions PCWrite etc.=1 PC MUX out in1 in2 control to Control FSM Instr. reg. (IR) 0 1 CauseWrite=1 Cause 32-bit register (hex) ALUSrcA=0 ALUSrcB=01 4 ALU ALU control Subtract PCSource 11 EPCWrite=1 EPC Overflow to Control FSM ALUOp =01 16 Apr 2013 Computer Architecture@IIT Mandi 16
17 How Long Does It Take? Again Assume control logic is fast and does not affect the cri,cal,ming. Major,me components are ALU, memory read/write, and register read/write. Time for hardware opera,ons, suppose Memory read or write 2ns Register read 1ns ALU opera,on 2ns Register write 1ns 16 Apr 2013 Computer Mandi 17
18 Single-Cycle Datapath R- type 6ns Load word (I- type) 8ns Store word (I- type) 7ns Branch on equal (I- type) 5ns Jump (J- type) 2ns Clock cycle,me = 8ns Each instruc,on takes one cycle 16 Apr 2013 Computer Architecture@IIT Mandi 18
19 Multicycle Datapath Clock cycle,me is determined by the longest opera,on, ALU or memory: Clock cycle,me = 2ns Cycles per instruc,on (CPI): lw 5 (10ns) sw 4 (8ns) R- type 4 (8ns) beq 3 (6ns) j 3 (6ns) 16 Apr 2013 Computer Architecture@IIT Mandi 19
20 CPI of a Computer k (Instructions of type k) CPI k CPI = k (instructions of type k) where CPI k = Cycles for instruction of type k Note: CPI is dependent on the instruction mix of the program being run. Standard benchmark programs are used for specifying the performance of CPUs. 16 Apr 2013 Computer Architecture@IIT Mandi 20
21 Example Consider a program containing: loads 25% stores 10% branches 11% jumps 2% Arithme,c 52% CPI = = 4.12 for mul,cycle datapath CPI = 1.00 for single- cycle datapath 16 Apr 2013 Computer Architecture@IIT Mandi 21
22 Multicycle vs. Single-Cycle Performance ratio = Single cycle time / Multicycle time (CPI cycle time) for single-cycle = (CPI cycle time) for multicycle ns = = ns Single cycle is faster in this case, but remember, performance ratio depends on the instruction mix. 16 Apr 2013 Computer Architecture@IIT Mandi 22
23 Traffic Flow 16 Apr 2013 Computer Mandi 23
24 ILP: Instruction Level Parallelism Single- cycle and mul,- cycle datapaths execute one instruc,on at a,me. How can we get beser performance? Answer: Execute mul,ple instruc,on at a,me: Pipelining Enhance a mul,- cycle datapath to fetch one instruc,on every cycle. Parallelism Fetch mul,ple instruc,ons every cycle. 16 Apr 2013 Computer Architecture@IIT Mandi 24
25 Thank You 16 Apr 2013 Computer Mandi 25
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