1 / 13

RegDst 1: RegFile destination No. for the WR Reg. comes from rd field.

RegDst 1: RegFile destination No. for the WR Reg. comes from rd field. 0: RegFile destination No. for the WR Reg. comes from rt field. RegWrite 1: general-purpose Reg. selected by the WR Reg. No. is written with the value of the WR data input. 0: None. ALUSrcA

flynn-moon
Download Presentation

RegDst 1: RegFile destination No. for the WR Reg. comes from rd field.

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. RegDst 1: RegFile destination No. for the WR Reg. comes from rdfield. 0: RegFile destination No. for the WR Reg. comes from rtfield.

  2. RegWrite 1: general-purpose Reg. selected by the WR Reg. No. is written with the value of the WR data input. 0: None.

  3. ALUSrcA 1: 1st ALU operand comes from Reg. A. 0: 1st ALU operand is the PC.

  4. MemRead 1: Memory contents as the location specified by the address input is put on MDR. 0: None.

  5. MemWrite 1: Memory contents as the location specified by the address input is replaced by the value on WR data input. 0: None.

  6. MemtoReg 1: Value fed to the RegFile WR data input comes from MDR. 0: Value fed to the RegFile WR data input comes from ALUOut.

  7. IorD 1: ALUOut is used to supply the address to the MEM. 0: PC is used to supply the address to the MEM.

  8. IRWrite 1: Output of the MEM is written into the IR. 0: None.

  9. PCWrite 1: PC is written; its source is decided by PCSource. 0: None.

  10. PCWriteCond 1: PC is written if Zero output of ALU is 1. 0: None.

  11. ALUOp 00: ALU performs add operation. 01: ALU performs subtract operation. 10: ALU operation determined by Func. field of instruction.

  12. ALUSrcB 00: 2nd ALU input comes from Reg. B. 01: 2nd ALU input is constant 4. 10: 2nd ALU input is sign-extended 16 LSBs of IR. 11: 2nd ALU input is sign-extended 16 LSBs of IR, left shifted in 2 bits.

  13. PCSource 00: Output of ALU (PC + 4). 01: ALUOut Reg. (branch target address). 10: Jump address (PC[31:28]IR[25:0]00).

More Related