For sub $rd, $rs, $rtReg[rd] = Reg[rs] + Reg[rt] - Which resources (blocks) perform a useful function for the given instructions? - Use the following diagram for each instruction and trace its flow(use pen or highlighter) for the execution of that instruction. - List the units that are used for each instruction. (I mainly need help with tracing, please and thank you)

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For sub $rd, $rs, $rtReg[rd] = Reg[rs] + Reg[rt]

- Which resources (blocks) perform a useful function for the given instructions?

- Use the following diagram for each instruction and trace its flow(use pen or highlighter) for the execution of that instruction.

- List the units that are used for each instruction.

(I mainly need help with tracing, please and thank you)

 

The image contains a detailed diagram and explanation of the basic implementation of the MIPS subset, including the necessary multiplexors and control lines. Below is the transcription and description as it would appear on an educational website:

---

**Diagram Explanation:**

The diagram illustrates the core components and data flow in a MIPS processor subset. Here's a breakdown of the key elements and processes:

- **PC (Program Counter):** Initiates the instruction fetch.
- **Instruction Memory:** Outputs the instruction to be executed.
- **PCMux:** A multiplexer determining the source of the next PC value, either PC + 4 or a branch destination.
- **ALU (Arithmetic Logic Unit):** Performs arithmetic/logical operations.
- **Register File:** Contains multiple registers identified by register numbers.
- **Data Memory:** Stores data that can be read or written.

**Control Lines:**

1. **RegWrite:** Controls writing data to a register.
2. **MemRead:** Enables reading data from memory.
3. **ALUMux:** Selects ALU operands from registers or immediate values.
4. **MemWrite:** Controls writing data to memory.
5. **ALUOp:** Specifies the operation the ALU should perform.
6. **RegMux:** Selects the source of data to be written to a register.
7. **Branch:** Determines if the next instruction is a branch.

**Control Line Operation Logic:**

- The top multiplexer controls the next PC address.
- The "AND" gate combines the Zero output of the ALU and a control signal to detect branch instructions.
- The middle multiplexer routes data to the register file from the ALU or Data Memory.
- The bottom multiplexer selects the ALU input source, either from registers or immediate values.

**TABLE OF INSTRUCTIONS AND SETTINGS:**

| **Instruction** | **RegWrite** | **MemRead** | **ALUMux** | **MemWrite** | **ALUOp** | **RegMux** | **Branch** |
|------------------|--------------|-------------|-------------|--------------|-----------|------------|-----------|
| sub rd, rs, rt   |              |             |             |              |           |            |           |
| sw Srt, imm(Srs) |              |             |             |              |           |            |           |
| beq Srs, Srt, Label |          |             |             |              |           |            |           |
| and
Transcribed Image Text:The image contains a detailed diagram and explanation of the basic implementation of the MIPS subset, including the necessary multiplexors and control lines. Below is the transcription and description as it would appear on an educational website: --- **Diagram Explanation:** The diagram illustrates the core components and data flow in a MIPS processor subset. Here's a breakdown of the key elements and processes: - **PC (Program Counter):** Initiates the instruction fetch. - **Instruction Memory:** Outputs the instruction to be executed. - **PCMux:** A multiplexer determining the source of the next PC value, either PC + 4 or a branch destination. - **ALU (Arithmetic Logic Unit):** Performs arithmetic/logical operations. - **Register File:** Contains multiple registers identified by register numbers. - **Data Memory:** Stores data that can be read or written. **Control Lines:** 1. **RegWrite:** Controls writing data to a register. 2. **MemRead:** Enables reading data from memory. 3. **ALUMux:** Selects ALU operands from registers or immediate values. 4. **MemWrite:** Controls writing data to memory. 5. **ALUOp:** Specifies the operation the ALU should perform. 6. **RegMux:** Selects the source of data to be written to a register. 7. **Branch:** Determines if the next instruction is a branch. **Control Line Operation Logic:** - The top multiplexer controls the next PC address. - The "AND" gate combines the Zero output of the ALU and a control signal to detect branch instructions. - The middle multiplexer routes data to the register file from the ALU or Data Memory. - The bottom multiplexer selects the ALU input source, either from registers or immediate values. **TABLE OF INSTRUCTIONS AND SETTINGS:** | **Instruction** | **RegWrite** | **MemRead** | **ALUMux** | **MemWrite** | **ALUOp** | **RegMux** | **Branch** | |------------------|--------------|-------------|-------------|--------------|-----------|------------|-----------| | sub rd, rs, rt | | | | | | | | | sw Srt, imm(Srs) | | | | | | | | | beq Srs, Srt, Label | | | | | | | | | and
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