C = 0

PC → IF → fRegNew (stall = 1)

fReg → ID → dRegNew (stall = 1)

dReg → EX → eRegNew

C = 1

PC → IF → fRegNew

fReg (stall = 1) → ID → dRegNew

dReg (stall = 1) → EX → eRegNew

C = 2

PC → IF → fRegNew

fReg → ID → dRegNew

dReg → EX → eRegNew

IF: xxx

ID: addi

EX: auipc

MEM: xxx

WB: xxx