CSE 141 Lecture Notes - Lecture 6: Combinational Logic, Longest Path Problem, Datapath

• School: UCSD
• Department: Computer Science & Engineering
• Course: CSE 141
• Professor: Leonard Emerson Porter

Document Summary

Ignoring control - which instruction does this active datapath represent? (#1) Ignoring control - which instruction does this active datapath represent? (#2) Ignoring control - which instruction does this active datapath represent? (#3) Doesn"t write out to reg file or reads from memory. Note: cpu is just a collection of state & combinational logic. A. register can be read in parallel w/ control signal gen place. B. instruction read can be done in parallel w/ control signal generation. D. the main alu can execute in parallel w/ control signal gen. Ops and or add, lw, sw sub, beq slt. Only the function codes tell you to add for an r-type instruction! D. regdst - want this to be 1 (for rd) B. alusrc - 1 (for sign-extend imm value) D. regdst - want it to be 0 (write to rt, not rd) C. no - be we should for better performance. D. no - just changing control signals is fine.