1 / 17

MIPS processor continued

Learn how to appropriately connect the different parts of a MIPS processor to carry out functions such as R-type, lw, sw, and beq instructions. Design a simplified MIPS processor that supports only addi instructions by designing the data path.

cfrancis
Download Presentation

MIPS processor continued

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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 Question • Design a simplified MIPS processor that supports only addi. 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 Exercise Answer • Design a simplified MIPS processor that supports only addi. 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) 26:21 20:16 15:0

  5. lw & sw?

  6. Data path only for lw and sw (answer)

  7. 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)

  8. 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)

  9. Answer

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

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

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

  13. 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

  14. 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?

  15. Add j?

  16. Supporting Jump Instruction

  17. In Class Exercise week-14-1.ppt

More Related