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MIPS processor continued

MIPS processor continued. Review. Different parts in the processor should be connected appropriately to be able to carry out the functions. Connections depending on what we need Learnt R-type, lw, sw, beq. In class exercise.

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MIPS processor continued

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  1. MIPS processor continued

  2. Review • Different parts in the processor should be connected appropriately to be able to carry out the functions. • Connections depending on what we need • Learnt R-type, lw, sw, beq

  3. In class exercise • Design a simplified MIPS processor that supports onlyaddi. Assume the control signals have been generated and only the data path needs to be designed. addi $rt, $rs, imm opcode (6 bits) rs (5 bits) rt (5 bits) imm (16 bits)

  4. In class excercise

  5. Data path for both R-type and memory-type instructions add $rd, $rs, $rt, format: opcode (6 bits) rs (5 bits) rt (5 bits) rd (5 bits) 00000 funct (6 bits) lw $rt, offset_value($rs): opcode (6 bits) rs (5 bits) rt (5 bits) offset (16 bits) sw $rt, offset_value($rs): opcode (6 bits) rs (5 bits) rt (5 bits) offset (16 bits)

  6. Data path for both R-type and memory-type instructions add $rd, $rs, $rt, format: opcode (6 bits) rs (5 bits) rt (5 bits) rd (5 bits) 00000 funct (6 bits) lw $rt, offset_value($rs): opcode (6 bits) rs (5 bits) rt (5 bits) offset (16 bits) sw $rt, offset_value($rs): opcode (6 bits) rs (5 bits) rt (5 bits) offset (16 bits)

  7. Datapath for R-type, memory, and branch operations

  8. Datapath for R-type, memory, and branch operations (Answer)

  9. Datapath for Memory, R-type and Branch Instructions, plus the control signals

  10. Jump Instruction • Jump instruction seems easy to implement • We just need to replace the lower 28 bits of the PC with the lower 26 bits of the instruction shifted by 2 bits • The shift is achieved by simply concatenating 00 to the jump offset week-13-3.ppt

  11. 31 26 25 0 0 0 0 0 1 0 opcode Address Implementing Jumps • The one we have supports arithmetic/logic instructions, branch instructions, load and store instructions • We need also to support the jump instruction • What are the changes we need to make?

  12. Supporting Jump Instruction

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