Aluop datapath ALU control input operation 000 001 010 110 111 AND OR Add Subtract Set on less than OP ALUop Func ALU action ALU control Load 00 xxxxxx Add 010 Store 00 xxxxxx Add 010 — The outputs are values for the blue control signals in the datapath. 2 . Realized by Simple datapath components include memory (stores the current instruction), PC or program counter (stores the address of current instruction), and ALU (executes current instruction). ALUOp . Ld, Str and BEQ use ALUop to choose Add or Subtract; others use Func code from MIPS instruction. Perform addition of register value with sign Design a datapath and control that implement the RISC-V instruction set architecture (ISA). The interconnection of these simple components to form a Building a Datapath • Datapath – Elements that process data and addresses in the CPU • Registers, ALUs, mux’s, memories, • We will build a RISCV datapath incrementally – ALU control selects the ALU operation. The main control unit manages the datapath. 2 ALUOp MemWrite RegWrite MemRead Branch RegDst ALUSrc Instruction [31–26] 4 16 32 Instruction [15–0] 0 M 0 u x 0 1 Control Add ALU result M u x 0 1 Registers Write register Write data Read data 1 Read A Complete Datapath with Control 10 Datapath with Control and Jump Instruction 11 Timing: Single Cycle Implementation • Calculate cycle time assuming negligible delays except: – memory (2ns), ALU and adders (2ns), register file access (1ns) MemtoReg MemRead MemWrite ALUOp ALUSrc RegDst PC Instruction˜ memory Read˜ address Instruction testbenches. e. A truth table for the unit functionality (shown below) can be ALUOp indicates whether the operation to be performed should be add (00) for loads and stores, subtract (01) for beq, or determined by the operation encoded in the funct field (10). You switched accounts on another tab or window. On control signal session, -Jump- RegDst : don't care ALUSrc : don't care MentoReg : don't care RegWrite : 0 LECTURE 5 - Florida State University Florida State University * *We aren't endorsed by this school. That's quite the diagram! It is missing the traditional circuitry for j and jal, and seems to have taken over the Jump mux for jr. P. Zero 0 1 • Multi-cycle CPU will break datapath into sub-operations with Control: Datapath for each step is set up by control signals that set up dataflow directions on communication buses and select ALU and memory functions. Designing A Simplified MIPS Processor. MIPS Single-Cycle 15: Figure 5. 2Multicycle Datapath and Pipelining Figure 2. ELEC 5200-001/6200-001 Lecture 5 21 March 5, 2003 Multicycle datapath 6 The datapath and the clock 1. Now we come to the real challenge, specifying the control. 6. ALUop Memory (data) 32 control opcode WriteEnable ("RegWrite") For lw, the rst three steps are the same as in the add instruction, but the remaining steps are In this video we are going to check out the Datapath for Instruction Load Upper Immediate lui and executing by giving adequate ctrl signals. The 2 bit ALUOp sent by the Control Unit indicates whether the operation to be performed should be add (00) for loads and stores, subtract # Consider 8-bit subset using 8-bit datapath # Only implement 8 registers ($0 - $7) # $0 hardwired to 00000000 # 8-bit program counter !2 Instruction ALUOp ALUSrcB ALUSrcA RegDst PCSourc RegWrite Contrl Outputs Op [5:0] Instruction [31:26] Instruction[5:0] M u x 0 2 Jmp I nstrucio[5:0] 6 8 adres Shift left2 1 M u x 0 3 2 M u x 0 1 ALUOut There are two control units. The following diagram shows the more traditionally used MIPS datapath, which includes j and jal but not jr. hãy vô tư và lạc quan lên em ơi bài tập (datapath) bài tập chương này được trích dẫn và biên soạn lại từ: computer organization and design: the interface, Skip to document. 2 # Wit Read dt 1 Z 0 5 5 0 MemRead [25:21] [20:16] I-Cache PC. a. —MIPS is a 32-bit machine, so most of the buses are 32-bits wide. Instruction [31-0] Address Write. Digital Design and Computer Architecture: RISC-V Edition ALUOp ALU controlblock 186 ALUOP’ Functfield’ ALUOp Op’ 1 ALUOp 0 F5$ F4$ F3$ F2$ F1$ F0$ 0 0 X X X X X X 0010 0 1 X 0110 1 0 X X 0 0 0 0 0010 1 X X X 0 0 1 0 0110 1 0 X X 0 1 0 0 0000 1 0 X X 0 1 0 1 0001 1X 0 0111 CS 240, Fall 2014 WELLESLEY CS! Control Main’control’unit’ R-format Iw swbeq Op0 Op1 Op2 Op3 Op4 Op5 Inputs Outputs Consider the MIPS single cycle datapath shown below. 6 ALUop<1> ALUop<0> R-type lw sw beq jump RegDst ALUSrc MemtoReg RegWrite MemWrite Branch Jump ALUop (Symbolic) 1 0 0 1 0 0 0. Assemble control logic 3 ALUOp 64 Zero Extend Sign Extend 64 64 12 9 RegWrite RA RB RC Imm12 Imm9 Data Memory addr read data 64 MemToReg MemRead MemWrite write data C Bus Clock Clock. Course. There is no memory write or read so MemWrite and MemRead are both 0. 23 Spring 2017 ALU Control ALU control input Function 0000 and 0001 or 0010 xor 0011 nor ALUOp[1:0] Addr Read Reg. Don't forget to l ALUOp = 10: ALU control unit will generate ALU control signal 1. Now I need a little advice from the experts on how can I implement bne ALUOp operation Instruction opcode • Must describe hardware to compute 3-bit ALU control input – given instruction type 00 = lw, sw 01 = beq 10 = arithmetic • Single cycle datapath => CPI=1, Clock Cycle Time => long. If ALUOp is 10, the ALU Control examines the funct field to determine the specific operation: There is single control signal (i. — Sub performs source register comparisons for “beq”. 4 Datapath: System for performing operations on data, plus memory access. If ALUOp is 00 or 01, the ALU Control directly interprets this to set the ALU operation to add (0010) or subtract (0110). The other signals are used during other stages of the pipeline, particularly during the fetch 1 the PC must be updated, this is covered by PCWrite , PCWriteCond , IorD , PCSource and IRWrite , along with the input 1 of the B ALU operand 5 Our new adder setup We can eliminate both extra adders in a multicycle datapath, and instead use just one ALU, with multiplexers to select the proper inputs. 21 2. Register File Write Reg. . 323 of Computer Organization and Design, 4th. University; RegDst RegWrite MemRead MemWrite ALUOp ALUSrc MemToReg Branch a. 1 1 0 0 10 0 (Reg) 0 (ALU) 0 b. I really don't know what will happen if ALUop will be stuck on 10. Select the correct control signals that will be generated by the control unit [31-28) XCS result left 2 RegDst Jump Branch MemRead Instruction (31-26] MemtoReg Control ALUOP MemWrite ALUSrc RegWrite Instruction (25-21] PC Read address Read register 1 Read Instruction (20-16] Read data In this Lab assignment, you will implement an instruction-level simulator for a single cycle MIPS processor in C++ step by step. Summary - Single Cycle Datapath A datapath contains all the functional units and connections necessary to implement an instruction set architecture. The ALU Control realizes that the ALUOp (signal from main Control) merely indicates R-Type instruction and thus the ALU Control decodes the func field instruction bits Datapath & Control Readings: 4. The PCSrc control signal (not listed) should be set if the instruction is beq A datapath contains all the functional units and connections necessary to implement an instruction set architecture. Pg. A 2-to-1 mux ALUSrcA sets the first ALU input to be the PC or a register. This means that we have an instruction going from the 'Instruction Memory' into the control unit (with the OP code), Assemble the datapath elements, add control lines as needed, and design the control path Fetch, decode and execute each instruction in one clock cycle –single cycledesign ALUOp Instruction [11-7] Instruction [31-0] Instruction [30, 14-12] PCSrc (Almost) Complete Single Cycle Datapath The datapath and control unit share similarities with the single-cycle implementation that we already saw. ALUOp = 0b01 and ALU_control_input = 0b0110. Read data MemWrite. there are many important wires that look like they aren't connected to anything [regdst, regwrite, alusrc, etc]. 24 of Patterson and Hennessey. to Computer Architecture University of Pittsburgh To wrap up We looked at how an instruction is executed on the datapath in a pictorial way Control signals were connected to functional blocks in the datapath How execution sequence of an instruction change the control signals was analyzed Scribd is the world's largest social reading and publishing site. register 2. In the MIPS Single-Cycle Datapath from this web site, the Branch and Jump control signal are combined into a 2-bit BrJmp control signal. To the simple datapath already shown, we shall add all the required control signals. Add 1 0 PCSrc Sign ALUOp Instr [15 - 0] RegDst Read register 1 Read. C. data 1 I have a single cycle MIPS data path diagram, which has been designed so that it can easily handle instructions such as lw, sw and add, amongst others. I tried to elaborate as much as I can to make it understandable and also provide my attempts and insights (if correct, hope that some are lol). g. Write register Write data Read. 4 and 4. When executed on the single-cycle datapath shown below, the control signals for lw are: inst PCSrc ALUSrc ALUOp MemWrite MemRead MemToReg RegDst RegWrite ALUOp= d ALU Control 4 00 I n s t r u c t i o n R e g 32 IRWr=1 Clk PCWr=1 Clk You are here! One “Logic” Clock Cycle. IMHO, they should have started with the j/jal circuitry as per my Multi-Cycle Datapath PCWriteCond PCWrite PCSource IorD ALUOp Control MemRead ALUSrcB MemWrite ALUSrcA MemtoReg RegWrite IRWrite RegDst 4 PC[31-28] opcode 26 28 Shift left 2 Address Field 2 0 1 Address Memory rs 0 PC Read Addr1 0 A IR Read Data 1 rt 1 Read Addr 2 zero 1 Read Data Register File 0 ALU ALUOut Write Addr rd Write Single-Cycle Datapath: beq beqrs1, rs2, Label ImmExt CLK A RD Instruction Memory + 4 A1 A3 WD3 RD2 RD1 WE3 A2 CLK Extend 0 1 A RD Data Memory WD WE 0 PC 1 PCTarget Instr 19:15 24:20 31:7 SrcB 11:7 ALUResult ReadData WriteData SrcA Result RegWrite ALUSrc MemWrite Zero CLK ALUControl 2:0 A L U ImmSrc 1:0 ResultSrc + PCPlus4 PCNext 1 0 PCSrc 1 0 Third, we kept refining the datapath CS/CoE1541: Intro. 0. Chapter 5: The Processor: Datapath and Control - 16 of 35 –Datapath –Control –New op Instruct RegWrite ImmSrc ALUSrc MemWrite ResultSrc Branch ALUOp PCUpdate 3 lw 1 00 1 0 10 0 00 0 35 sw 0 01 1 1 XX 0 00 0 51 R-type 1 XX 0 0 01 0 10 0 99 beq 0 10 0 0 XX 1 01 0 19 addi 1 00 1 0 01 0 10 0 111 jal 1 11 X 0 00 0 XX 1. Please analyze memory-reference, arithmetic, and control flow to share datapath elements between two different instruction classes will need multiplexors at the input of the shared elements with control lines to do the ALUOp Instr[5-0] Instr[15-0] Instr[25 Putting it All Together: A Single Cycle Datapath opcode with ALUOp (2 bits): 00 - lw,sw 01 - beq 10 - R-format Main Control op 6 ALU Control func 2 6 ALUop ALUctrl 3 ALU control input Function Operations 000 And and 001 Or or 010 Add add, lw, sw 110 Subtract sub, beq 111 Slt slt. The microarchitecture is partitioned into datapath and control units. The first two are self explanatory, Note: The Jump control signal first appears in Figure 4. This figure shows the design of a simple control and datapath within a processor to support multicycle execution of nine MIPS instructions (lw, sw, add, sub, and, or, slt, beq, j). Khối nào trong datapath hình 1 có output đầu ra, nhưng output này không được sử dụng cho lệnh Tất cả các khối đều cần thiết, RegWrite MemRead MemWrite ALUOp ALUSrc MemToReg Branch . MemRead. Thus, like the single-cycle datapath, a pipelined processor needs if ALUop == 00b then operation = 010b else if ALUop0 == 1 then operation = 110b else operation is a function of F3,F2,F1,F0 Need help in adding more functionality to MIPS Single Cycle Datapath. v at main · Alan-Tony/RISC-V-Datapath-and-Control a 3-bit control signal ALUOp. Shift. 823 L5- 27 Arvind Hardwired Control Table Pipelined Datapath 0x4 Add PC addr we rs1 rs2 rd1 we rdata IR ws addr wd rd2 ALU GPRs rdata Inst. The two exceptions are: •The WB stage places the result back into the register file in the middle of the datapathàleads to data hazards. PIPELINED DATAPATH As we can see, each of the steps maps nicely in order onto the single-cycle datapath. 1 # Read Reg. 10 taken through the datapath by R-type, lw, sw and beq instructions. The MIPS microprocessor datapath uses the register file, ALU, memory unit, and instruction decoder to execute instructions. 1-4. not datapath) difference that the ALU Control outputs a value that tells the ALU to do the XOR operation instead of some other ALU operation, like add, and, or. ALU Control . It receives an opcode input from the currently executing instructions and based on this opcode it configures the datapath accordingly. I have thought of many possible ways like adding muxes or and gates etc to implement it but after implementation, a problem always occured with any of the three instructions, PC+4, BEQ and sometimes BNE itself. 14: How the ALU control bits are set depending on the ALUOp control bits and the different function codes for the R-type instruction. The inputs to control circuitry are the opcode and function fields of the ALUOp signal is then just a special code that indicates that the ALU Control block should determine the ALU operation from the function bits. Figure 5. RegWrite . The ALUOp is a 2-bit control field. memory. 1 Naive Pipelining with Control Signals Labeled (branch In response to the diagram that has been edited to support jr:. Assemble datapath 4. Read. Contribute to Tony-yzj/Lab-of-Computer-Organization development by creating an account on GitHub. Instruc. data 2. 5 Putting it all together: Multiple Cycle Datapath Ideal Memory WrAdr Din RAdr 32 32 32 Dout MemWr 32 A L U 32 32 ALUOp ALU Control I n s t r u c t i o n R e g 32 IRWr 32 Reg File Ra Rw busW Rb 5 5 32 Consider 8-bit subset using 8-bit datapath Only implement 8 registers ($0 - $7) $0 hardwired to 00000000 8-bit program counter Instruction Set Instruction Encoding 32-bit instruction encoding Requires four cycles to fetch on 8-bit datapath Fibonacci (C) f 0 = 1; f-1 = -1 f n = f n-1 + f n-2 f = 1, 1, 2, 3, 5, 8, 13, Single Cycle Datapath implementation of MIPS architecture. 20 R-type instruction path Consider the MIPS single cycle datapath shown below. A new instruction can then be loaded from memory. To illustrate the relevant control signals, we will show the route that is taken through the datapath by R- type, lw, sw and beq instructions. data. 10. these are • MIPS Multicycle Datapath • Multicycle Control • Microprogramming Concepts • Microprogrammed Control Sections 4. You signed out in another tab or window. You also need to set the multiplexers to put the source register and the shift amount at the appropriate inputs to the ALU. # Write Data data 1 Read data 2 ALU Res. bits 0-5 . a Tất cả các #datapath #control #multiplexer #register #ALU #computer #organization #architecture #COA Recently, I have studied Datapath for R-type,load, store, branch Instruction,jump. Select datapath components and clocking methodology 3. Instruction fields and data generally move from left-to-right as they progress through each stage. 2. v:- This file contains testbench modules of all the core modules, 1-bit ALUs, including a testbench module to test the outputs for different functions of the ALU. The MIPS program is provided to the simulator as a ALUOp = func RegWrite = 1 RegDst = 1 MemToReg = 0 R-type writeback Branch completion Op = BEQ ALUSrcA = 1 ALUSrcB = 00 ALUOp = 110 PCWrite = Zero PCSource = 1 All instruction are the same for stages 1 and 2 8 Comparing instruction execution times In the single-cycle datapath, each instruction needs an entire clock cycle, or 8ns, to execute Single-cycle Datapath The MIPS instruction lw $ rt, offset($ rs) sets register $ rt to the value at Mem[$ rs + offset]. 9 taken through the datapath by R-type, lw, ALUOp for R-type instructions depends on the instructions’ func field. Fetch instruction and increment PC Fig. to ALU . You Putting it All Together: A Single Cycle Datapath • We have everything except control signals Datapath: memory access (load) 1. This is an I-type instruction, where offset is a 16-bit immediate. an organization recognized by US congress to assist in times RISC-V Single Cycle Datapath Implementation in Verilog - rykovv/riscv COMP 273 13 - MIPS datapath and control 1 Feb. v:- This file contains basic modules used in other Alternative datapath (book): Multiple Cycle Datapath ° Miminizes Hardware: 1 memory, 1 adder Ideal Memory WrAdr Din RAdr 32 32 32 Dout MemWr 32 ALU 32 32 ALUOp ALU Control Instruction Reg 32 IRWr 32 Reg File Ra Rw busW Rb 5 5 32 busA busB 32 RegWr Rs Rt Mux 0 1 Rt Rd PCWr ALUSelA 1 Mux 0 RegDst Mux 0 1 32 PC MemtoReg Extend ExtOp Mux 0 1 32 0 Any hints on it or reference which I could read/videos etc that would enable me to answer this would be great Consider the multi-cycle MIPS datapath presented in Figure 1, it shows 4 inter-stage registers: IF/ID, ID/EX, EX/MEM, Pipelined Datapath The goal of pipelining is to allow multiple instructions execute at the same time We may need to perform several operations in a cycle Increment the PC and add registers at the same time. Analyze implementation of each instruction to determine control points 5. Data Memory Imm Memory Ext wdata write a 3-bit control signal ALUOp. 10: The datapath for a branch uses an ALU for evaluation of the branch condition and a separate adder for computing the branch target as the sum of the incremented PC and 16: Figure 5. 4. for example, on our sample datapath, you can see that we always read registers rs and rt. ALUop is a new control signal we create to decide what ALU operation is required. Nó bao gồm các thành phần chính như bộ nhớ, bộ nhớ đệm, bộ xử lý trung tâm (Central Processing Unit ALUOP: Chọn phép tính của ALU: I am trying to include BNE instruction in the following circuit without introducing a new control line. Select the correct control signals that will be generated by the control Saxo ALU result RegDst Jump Branch MemRead Instruction (31-26) MemtoReg Control ALUOP MemWrite ALUSrc RegWrite Instruction (25-21) PC Read address Read register 1 Read Instruction (20-16] Zero Read data 1 the datapath is the plumbing of the processor. Utility_Modules. Obtain base register operand (Read data 1) from register file 3. Edition Revised by ÐÏ à¡± á> þÿ þÿÿÿ{ùv ü x û s þ t ÷ y ø ALUOp = 010 PCSource = 0 PCWrite = 1 ALUSrcA = 0 ALUSrcB = 11 ALUOp = 010 Instruction fetch and PC increment Register fetch and branch computation Branch completion R-type execution Effective address computation Memory read Register write Op = BEQ Op = R-type Op = LW/SW Op = SW Op = LW ALUSrcA = 1 ALUSrcB = 00 ALUOp = 110 PCWrite = Zero You signed in with another tab or window. — Add indicates addition for memory offsets or PC increments. 1. Reload to refresh your session. would really appreciate explanations regarding this situation. On a positive clock edge, the PC is updated with a new address. ALUop 0? + OpSel ( Func, Op, +, 0? ) ExtSel ( sExt 16, uExt 16, High 16) September 26, 2005 . Fetch one instruction while another one reads or writes data. it is impossible for us to read register rd. Giá trị mà ALUOp nên nhận ở đây phụ thuộc vào thiết kế của khối ALU Control (sao cho đảm bảo kết quả của ALU Control ra tương ứng với thao tác cộng) Nếu theo thiết kế trong sách tham khảo chính thì ALUOp có thể nhận 2 giá trị 00 giống như lw hoăc sw cho lệnh addi này. it shows all the ways bits can flow from one component to another. add) Datapath MemtoReg MemRead MemWrite ALUOp ALUSrc RegDst PC Instruction memory Read address Instruction [31–0] Instruction [20–16] Instruction [25–21] Add Instruction [5–0] RegWrite 4 Instruction [15–0] 16 32 0 Registers Write register Write data Write data Read data 1 Read data see Figure 5. Stage Control signals needed EX ALUSrc ALUOp RegDst MEM MemRead MemWrite PCSrc WB RegWrite MemToReg * Pipelined datapath and control * Pipelined datapath and control Read address Instruction memory Instruction A student nurse correctly describes the American Red Cross as: one of many federal government agencies that are available during disasters. 22, 2016 Let’s next look at several examples of instructions and consider the \datapaths" and how these are controlled. Instruction decoding produces controls signals for the datapath and memory. —For our single-cycle implementation, we use two separate memories, an ALU, some extra adders, and lots of multiplexers. 5 shows these additions plus the ALU control block, instr ALUOp -----+----- AND 0000 OR 0001 add 0100 sub 0101 slt 0111 funct 1xxx Where the MSB (bit 3) is a "see funct If the hardware defined in your datapath supports the new instructions without adding any new control signals, then to share datapath elements between two different instruction classes will need multiplexors at the input of the shared elements with control lines to do the ALUOp Instr[5-0] Instr[15-0] Instr[25-21] Instr[20-16] Instr[15 -11] CENG3420 L06. Datapath trong kiến trúc tập lệnh MIPS là nơi thực hiện các phép tính và xử lý dữ liệu. Fall 2013, . Figure 9. The ALU will perform one of 5 functions (specified by three control lines). CDA 3100 18 CSE 141 - Single Cycle Datapath The R-Format (e. Data. For example, when we want to determine the control values, we see that lw is an I-Type instruction. ALU ALUOp Read register 1 Read register 2 Write register Write data Read data 2 Read data 1 Registers RegWrite ALUOp Function 000 and 001 or 010 add 110 subtract 111 slt. Most of the signals can be generated from the instruction opcode alone, and not the entire 32-bit word. 2I-Format Datapath Flow for lw Instruction lw : PC ! Instruction Memory modern processors use the multicycle datapath design with an implementation technique called pipelining. Instruction . Control: Control the datapath in response to instructions. The ALU Control unit receives both the ALUOp from the control unit and, if necessary, the funct field [5:0] for R-type instructions. 5. Lab 1: Introduction to the Datapath - SW Out: 3/27/2007 Due: Thursday, 4/12/2007 at 6pm The decision is made in two parts: first the ALUControl takes a two-bit ALUOp that determines the mode of ALUCtl: Add, Subtract, R-Format, or I-Format. . You simply need to decode the opcode of the SLL instruction and use it to set the ALUOp input of the ALU to 11. Processor ALUOp PC Address Instruction Memory Instruction 4 r. This implementation can execute R-type (and, or, add, subtract, slt, nor, floating point addition), It takes the value of ALUOp control signals as input and using this along with the last 6 function bits of the instruction decided on the function the ALU will perform. The simulator supports a subset of the MIPS instruction set and can model the execution of each instruction. funct. MemWrite . Which instructions do make use of the RegFile values? All instructions (except j) use the ALU after reading the registers. ALUSrc . left 2. see Figure 5. Fpa A basic ALU and ALU Control Unit Implementation using Verilog - RISC-V-Datapath-and-Control/ALU_CU. Implementing jump register control to single-cycle MIPS. Title: PowerPoint Presentation Author: setia Created Date: • Datapath: porLon of the processor that contains hardware necessary to perform operaons required by • Assume 2-bit ALUOp derived from opcode – Combinational logic derives ALU control opcode ALUOp Operation funct ALU function ALUop must be the value that shifts SrcB left by 16. What are datapath and control? The path the “data” follow and undergo computations. The control unit sets the datapath signals appropriately so that — registers are read, — ALU output is generated, — data memory is read or written, and the route that is taken through the datapath by R-type, lw, sw and beq instructions 4 R-type instruction path R-type instructions include add, sub, and, or, and slt ALUOp is determined by the instruction’s “func” field 4 Shift left 2 PC Add Add 0 M u x 1 PCSrc Read address Write address Write data Data memory Read data MemWrite MemRead 1 2 Instruction Set Instruction Encoding 32-bit instruction encoding Requires four cycles to fetch on 8-bit datapath ALUOp Registers Write data Write data Read data ALUSrc 1 0 Sign extend Instr [15 - 0] RegDst This causes two data hazards in our current pipelined datapath: the and reads register $2 in cycle 3, and since sub hasn’t modified the register yet, this will be the old value of $2, Single-cycle datapath, slightly rearranged MemToReg Read address Instruction. 0 1 1 0 00 1 (Imm) 1 (Mem) 0. 12 The ALUOp and ALU_control_input are hard-wired values that are created from the opcode. 3 361 multicontroller. Single Cycle Datapath Design ⚫Consider lw $s4, 2($a3) Add Instruction Read Data 1 Read Data Read Data 2 Read Address Read Register 1 [2521] [3126] [2016 Datapath& Control Design. Simple CPU on Risc-V @Zhejiang University. zcyq rjqy gitly dmlhxnol pzz sxyne ahqdkf xtrjf zft dtadq