pipline核心模块的判断代码.txt

hazardunit——loaduse stall判断
3.  ID Hazard Detection
if    (ID/EX.MemRead
and ((ID/EX.RegisterRt——mux2_out = IF/ID.RegisterRs——Instruction[25:21])
or   (ID/EX.RegisterRt ——mux2_out = IF/ID.RegisterRt——Instruction[20:16])))
stall the pipeline

forwardunit——R-beq
4. 从EX/MEM中旁路源操作数

if (IDcontrol.Branch
and EX/MEM.MemRead==1
and (EX/MEM.RegisterRd != 0)
and (EX/MEM.RegisterRd = IF/ID.RegisterRs))
mux4_control=2 (数据通路为RData)

if (IDcontrol.Branch
and EX/MEM.MemRead==1
and (EX/MEM.RegisterRd != 0)
and (EX/MEM.RegisterRd = IF/ID.RegisterRt))
mux3_control=2(数据通路为RData)

if (IDcontrol.Branch
and (EX/MEM.RegisterRd != 0)
and (EX/MEM.RegisterRd = IF/ID.RegisterRs))
	mux4_control=1	
if (IDcontrol.Branch
and (EX/MEM.RegisterRd != 0)
and (EX/MEM.RegisterRd = IF/ID.RegisterRt))
mux3_control=1












默认值都为0！！！！！！！！！！！！！！！！！！！！！！！！！！！
（r-r型）相邻指令的转发
if (EX/MEM.RegWrite
and (EX/MEM.RegisterRd != 0)
and (EX/MEM.RegisterRd == ID/EX.RegisterRs))
mux5_control=2
//mux1_control=2


if (EX/MEM.RegWrite
and (EX/MEM.RegisterRd != 0)
and (EX/MEM.RegisterRd == ID/EX.RegisterRt))
//mux5_control=
mux1_control=2

（r-r/r-l/r-l在install后）隔一条指令的转发
2.  MEM/WB hazard:
if (MEM/WB.RegWrite
and (MEM/WB.RegisterRd != 0)
and (MEM/WB.RegisterRd == ID/EX.RegisterRs)
and (EX/MEM.RegisterRd != ID/EX.RegisterRs || ~ EX/MEM.RegWrite))
mux5_control=1
//mux1_control=

if (MEM/WB.RegWrite
and (MEM/WB.RegisterRd != 0)
and (MEM/WB.RegisterRd == ID/EX.RegisterRt)
and (EX/MEM.RegisterRd != ID/EX.RegisterRt || ~ EX/MEM.RegWrite)))
//mux5_control=
mux1_control=1