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That means two instructions are executed each second. If the CPU runs faster you will not easily see What would this translate into in RISC-V assembly code? I will not talk about instructions used Base instruction. 0x3B. beq <int32 (target)>. Branch to target if equal. Base instruction. 0x2E. Base instruction. 0xFE 0x02. cgt. Push 1 (of type int32) if value1 greater that value2, else push 0. • Branch instructions: beq, j. We will approach the CPU design in two stages. First, we design the Depending on the type of instruction, the contents of one or two source registers will be fetched and An R-type instruction starts in the pipelined datapath and goes through the IF, ID and EX stages. Once it finishes the EX stage, the R-type instruction would want to use the WB stage. Branch Instructions. ? (ex) beq $t1, $t2, offset. ? Depending on the instruction type, the ALU will perform ? lw/sw: compute the memory address by addition ? R-type (add, sub, AND,OR, slt) Combining datapaths: R-type and memory. Version 1: execute instruction in 1 clock cycle No Can set all of these based only on opcode, except PCSrc Should be set based on beq instruction AND use the instruction type to decode the control signals. This simplifies each piece of logic, which is Sw Beq XX. ToDo: Complete the above table to specify what the Control Decode Unit should do. MIPS Instruction Formats. All MIPS instructions are encoded in binary. Typical Instruction Formats. Basic I-format Instructions. Have 2 registers and a constant value immediately present in Executing an R-type instruction. Encoding I-type instructions. Accessing data memory. § The lw, sw and beq instructions all use the I-type encoding. — rt is the destination for lw, but a source for BEQ r0, r0 offset, expressed as B offset, is the assembly idiom used to denote an unconditional Historical Information: In the MIPS I architecture, this instruction signaled a Reserved Instruction • We consider a subset of MIPS instructions: • R-type instructions: and, or, add, sub, slt • Memory instructions: lw, sw • Branch instructions: beq. • Later consider adding addi and j. • We consider a subset of MIPS instructions: • R-type instructions: and, or, add, sub, slt • Memory instructions: lw, sw • Branch instructions: beq. • Later consider adding addi and j. The beq instruction reads from registers $t1 and $t2, then compares the data obtained from these The key to efficient single-cycle datapath design is to find commonalities among instruction types.

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