forked from Github_Repos/cvw
fixed issue with BTB's valid bit not updating. There is still a problem is valid not ocurring in the correct clock cycle.
This commit is contained in:
Ross Thompson
parent
95dbc5f1fa
commit
49348d734b
@ -38,21 +38,24 @@ add wave -noupdate -expand -group HDU -expand -group Stall -color Orange /testbe
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add wave -noupdate -expand -group HDU -expand -group Stall /testbench/dut/hart/ifu/StallE
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add wave -noupdate -expand -group HDU -expand -group Stall /testbench/dut/hart/ifu/StallM
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add wave -noupdate -expand -group HDU -expand -group Stall /testbench/dut/hart/ifu/StallW
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add wave -noupdate -expand -group Bpred -group direction -color Yellow /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/GHRF
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add wave -noupdate -expand -group Bpred -group direction -divider Lookup
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add wave -noupdate -expand -group Bpred -group direction /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/LookUpPC
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add wave -noupdate -expand -group Bpred -group direction /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/LookUpPCIndex
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add wave -noupdate -expand -group Bpred -group direction /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/PredictionMemory
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add wave -noupdate -expand -group Bpred -group direction /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/Prediction
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add wave -noupdate -expand -group Bpred -group direction -divider Update
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add wave -noupdate -expand -group Bpred -group direction /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/UpdatePC
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add wave -noupdate -expand -group Bpred -group direction /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/UpdatePCIndex
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add wave -noupdate -expand -group Bpred -group direction /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/UpdateEN
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add wave -noupdate -expand -group Bpred -group direction /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/UpdatePrediction
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add wave -noupdate -expand -group Bpred -group direction -expand -group other /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/DoForwarding
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add wave -noupdate -expand -group Bpred -group direction -expand -group other /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/DoForwardingF
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add wave -noupdate -expand -group Bpred -group direction -expand -group other /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/GHRD
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add wave -noupdate -expand -group Bpred -group direction -expand -group other /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/GHRE
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add wave -noupdate -expand -group Bpred -expand -group direction -color Yellow /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/GHRF
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add wave -noupdate -expand -group Bpred -expand -group direction -divider Lookup
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add wave -noupdate -expand -group Bpred -expand -group direction /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/LookUpPC
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add wave -noupdate -expand -group Bpred -expand -group direction /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/LookUpPCIndex
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add wave -noupdate -expand -group Bpred -expand -group direction /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/PredictionMemory
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add wave -noupdate -expand -group Bpred -expand -group direction /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/Prediction
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add wave -noupdate -expand -group Bpred -expand -group direction /testbench/dut/hart/ifu/bpred/BPPredF
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add wave -noupdate -expand -group Bpred -expand -group direction -expand -group output /testbench/dut/hart/ifu/bpred/BPPredPCF
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add wave -noupdate -expand -group Bpred -expand -group direction -expand -group output /testbench/dut/hart/ifu/bpred/SelBPPredF
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add wave -noupdate -expand -group Bpred -expand -group direction -divider Update
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add wave -noupdate -expand -group Bpred -expand -group direction /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/UpdatePC
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add wave -noupdate -expand -group Bpred -expand -group direction /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/UpdatePCIndex
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add wave -noupdate -expand -group Bpred -expand -group direction /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/UpdateEN
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add wave -noupdate -expand -group Bpred -expand -group direction /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/UpdatePrediction
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add wave -noupdate -expand -group Bpred -expand -group direction -group other /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/DoForwarding
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add wave -noupdate -expand -group Bpred -expand -group direction -group other /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/DoForwardingF
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add wave -noupdate -expand -group Bpred -expand -group direction -group other /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/GHRD
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add wave -noupdate -expand -group Bpred -expand -group direction -group other /testbench/dut/hart/ifu/bpred/Predictor/DirPredictor/GHRE
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add wave -noupdate -expand -group Bpred -expand -group {bp wrong} /testbench/dut/hart/ifu/bpred/TargetWrongE
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add wave -noupdate -expand -group Bpred -expand -group {bp wrong} /testbench/dut/hart/ifu/bpred/FallThroughWrongE
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add wave -noupdate -expand -group Bpred -expand -group {bp wrong} /testbench/dut/hart/ifu/bpred/PredictionDirWrongE
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@ -62,11 +65,17 @@ add wave -noupdate -expand -group Bpred -expand -group {bp wrong} /testbench/dut
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add wave -noupdate -expand -group Bpred -expand -group {bp wrong} -divider pcs
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add wave -noupdate -expand -group Bpred -expand -group {bp wrong} /testbench/dut/hart/ifu/bpred/PCD
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add wave -noupdate -expand -group Bpred -expand -group {bp wrong} /testbench/dut/hart/ifu/bpred/PCTargetE
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add wave -noupdate -expand -group Bpred -expand -group BTB /testbench/dut/hart/ifu/bpred/TargetPredictor/validMem/memory
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add wave -noupdate -expand -group Bpred -expand -group BTB /testbench/dut/hart/ifu/bpred/TargetPredictor/validMem/WA1
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add wave -noupdate -expand -group Bpred -expand -group BTB /testbench/dut/hart/ifu/bpred/TargetPredictor/validMem/WEN1
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add wave -noupdate -expand -group Bpred -expand -group BTB /testbench/dut/hart/ifu/bpred/TargetPredictor/validMem/RA1
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add wave -noupdate -expand -group Bpred -expand -group BTB /testbench/dut/hart/ifu/bpred/TargetPredictor/validMem/RD1
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add wave -noupdate -expand -group Bpred -expand -group BTB -divider Update
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add wave -noupdate -expand -group Bpred -expand -group BTB /testbench/dut/hart/ifu/bpred/TargetPredictor/UpdateEN
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add wave -noupdate -expand -group Bpred -expand -group BTB /testbench/dut/hart/ifu/bpred/TargetPredictor/UpdatePC
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add wave -noupdate -expand -group Bpred -expand -group BTB /testbench/dut/hart/ifu/bpred/InstrClassE
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add wave -noupdate -expand -group Bpred -expand -group BTB /testbench/dut/hart/ifu/bpred/TargetPredictor/UpdateTarget
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add wave -noupdate -expand -group Bpred -expand -group BTB /testbench/dut/hart/ifu/bpred/TargetPredictor/UpdatePCIndexQ
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add wave -noupdate -expand -group Bpred -expand -group BTB -divider Lookup
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add wave -noupdate -expand -group Bpred -expand -group BTB /testbench/dut/hart/ifu/bpred/TargetPredictor/TargetPC
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add wave -noupdate -expand -group Bpred -expand -group BTB /testbench/dut/hart/ifu/bpred/TargetPredictor/InstrClass
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@ -91,31 +100,31 @@ add wave -noupdate -group {Decode Stage} /testbench/dut/hart/ieu/c/RegWriteD
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add wave -noupdate -group {Decode Stage} /testbench/dut/hart/ieu/dp/RdD
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add wave -noupdate -group {Decode Stage} /testbench/dut/hart/ieu/dp/Rs1D
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add wave -noupdate -group {Decode Stage} /testbench/dut/hart/ieu/dp/Rs2D
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add wave -noupdate -expand -group RegFile /testbench/dut/hart/ieu/dp/regf/rf
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add wave -noupdate -expand -group RegFile /testbench/dut/hart/ieu/dp/regf/a1
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add wave -noupdate -expand -group RegFile /testbench/dut/hart/ieu/dp/regf/a2
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add wave -noupdate -expand -group RegFile /testbench/dut/hart/ieu/dp/regf/a3
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add wave -noupdate -expand -group RegFile /testbench/dut/hart/ieu/dp/regf/rd1
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add wave -noupdate -expand -group RegFile /testbench/dut/hart/ieu/dp/regf/rd2
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add wave -noupdate -expand -group RegFile /testbench/dut/hart/ieu/dp/regf/we3
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add wave -noupdate -expand -group RegFile /testbench/dut/hart/ieu/dp/regf/wd3
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add wave -noupdate -expand -group RegFile -group {write regfile mux} /testbench/dut/hart/ieu/dp/ALUResultW
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add wave -noupdate -expand -group RegFile -group {write regfile mux} /testbench/dut/hart/ieu/dp/ReadDataW
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add wave -noupdate -expand -group RegFile -group {write regfile mux} /testbench/dut/hart/ieu/dp/CSRReadValW
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add wave -noupdate -expand -group RegFile -group {write regfile mux} /testbench/dut/hart/ieu/dp/ResultSrcW
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add wave -noupdate -expand -group RegFile -group {write regfile mux} /testbench/dut/hart/ieu/dp/ResultW
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add wave -noupdate -expand -group alu /testbench/dut/hart/ieu/dp/alu/a
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add wave -noupdate -expand -group alu /testbench/dut/hart/ieu/dp/alu/b
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add wave -noupdate -expand -group alu /testbench/dut/hart/ieu/dp/alu/alucontrol
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add wave -noupdate -expand -group alu /testbench/dut/hart/ieu/dp/alu/result
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add wave -noupdate -expand -group alu /testbench/dut/hart/ieu/dp/alu/flags
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add wave -noupdate -expand -group alu -divider internals
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add wave -noupdate -expand -group alu /testbench/dut/hart/ieu/dp/alu/overflow
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add wave -noupdate -expand -group alu /testbench/dut/hart/ieu/dp/alu/carry
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add wave -noupdate -expand -group alu /testbench/dut/hart/ieu/dp/alu/zero
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add wave -noupdate -expand -group alu /testbench/dut/hart/ieu/dp/alu/neg
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add wave -noupdate -expand -group alu /testbench/dut/hart/ieu/dp/alu/lt
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add wave -noupdate -expand -group alu /testbench/dut/hart/ieu/dp/alu/ltu
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add wave -noupdate -group RegFile /testbench/dut/hart/ieu/dp/regf/rf
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add wave -noupdate -group RegFile /testbench/dut/hart/ieu/dp/regf/a1
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add wave -noupdate -group RegFile /testbench/dut/hart/ieu/dp/regf/a2
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add wave -noupdate -group RegFile /testbench/dut/hart/ieu/dp/regf/a3
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add wave -noupdate -group RegFile /testbench/dut/hart/ieu/dp/regf/rd1
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add wave -noupdate -group RegFile /testbench/dut/hart/ieu/dp/regf/rd2
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add wave -noupdate -group RegFile /testbench/dut/hart/ieu/dp/regf/we3
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add wave -noupdate -group RegFile /testbench/dut/hart/ieu/dp/regf/wd3
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add wave -noupdate -group RegFile -group {write regfile mux} /testbench/dut/hart/ieu/dp/ALUResultW
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add wave -noupdate -group RegFile -group {write regfile mux} /testbench/dut/hart/ieu/dp/ReadDataW
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add wave -noupdate -group RegFile -group {write regfile mux} /testbench/dut/hart/ieu/dp/CSRReadValW
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add wave -noupdate -group RegFile -group {write regfile mux} /testbench/dut/hart/ieu/dp/ResultSrcW
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add wave -noupdate -group RegFile -group {write regfile mux} /testbench/dut/hart/ieu/dp/ResultW
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add wave -noupdate -group alu /testbench/dut/hart/ieu/dp/alu/a
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add wave -noupdate -group alu /testbench/dut/hart/ieu/dp/alu/b
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add wave -noupdate -group alu /testbench/dut/hart/ieu/dp/alu/alucontrol
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add wave -noupdate -group alu /testbench/dut/hart/ieu/dp/alu/result
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add wave -noupdate -group alu /testbench/dut/hart/ieu/dp/alu/flags
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add wave -noupdate -group alu -divider internals
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add wave -noupdate -group alu /testbench/dut/hart/ieu/dp/alu/overflow
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add wave -noupdate -group alu /testbench/dut/hart/ieu/dp/alu/carry
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add wave -noupdate -group alu /testbench/dut/hart/ieu/dp/alu/zero
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add wave -noupdate -group alu /testbench/dut/hart/ieu/dp/alu/neg
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add wave -noupdate -group alu /testbench/dut/hart/ieu/dp/alu/lt
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add wave -noupdate -group alu /testbench/dut/hart/ieu/dp/alu/ltu
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add wave -noupdate /testbench/InstrFName
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add wave -noupdate -expand -group dcache /testbench/dut/hart/MemAdrM
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add wave -noupdate -expand -group dcache /testbench/dut/hart/MemPAdrM
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@ -145,6 +154,9 @@ add wave -noupdate -expand -group PCS /testbench/dut/hart/ifu/PCD
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add wave -noupdate -expand -group PCS /testbench/dut/hart/PCE
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add wave -noupdate -expand -group PCS /testbench/dut/hart/PCM
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add wave -noupdate -expand -group PCS /testbench/dut/hart/ifu/PCW
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add wave -noupdate -expand -group PCS -expand -group pcnextmux /testbench/dut/hart/ifu/PCNextF
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add wave -noupdate -expand -group PCS -expand -group pcnextmux /testbench/dut/hart/ifu/PCNext0F
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add wave -noupdate -expand -group PCS -expand -group pcnextmux /testbench/dut/hart/ifu/PCNext1F
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add wave -noupdate -group {function radix debug} /testbench/functionRadix/function_radix/FunctionAddr
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add wave -noupdate -group {function radix debug} -radix unsigned /testbench/functionRadix/function_radix/ProgramAddrIndex
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add wave -noupdate -group {function radix debug} /testbench/functionRadix/function_radix/reset
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@ -164,8 +176,9 @@ add wave -noupdate -expand -group {performance counters} /testbench/dut/hart/pri
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add wave -noupdate -expand -group {performance counters} /testbench/dut/hart/priv/csr/genblk1/counters/MHPMCOUNTERH
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add wave -noupdate -expand -group {performance counters} /testbench/dut/hart/priv/csr/genblk1/counters/MCOUNTEN
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add wave -noupdate -expand -group {performance counters} /testbench/dut/hart/priv/csr/genblk1/counters/MCOUNTINHIBIT_REGW
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add wave -noupdate /testbench/dut/hart/ifu/SelBPPredF
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TreeUpdate [SetDefaultTree]
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WaveRestoreCursors {{Cursor 2} {5407 ns} 0}
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WaveRestoreCursors {{Cursor 2} {5208 ns} 0}
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quietly wave cursor active 1
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configure wave -namecolwidth 250
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configure wave -valuecolwidth 229
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@ -181,4 +194,4 @@ configure wave -griddelta 40
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configure wave -timeline 0
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configure wave -timelineunits ns
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update
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WaveRestoreZoom {5204 ns} {5476 ns}
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WaveRestoreZoom {4927 ns} {5489 ns}
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@ -33,6 +33,7 @@ module BTBPredictor
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)
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(input logic clk,
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input logic reset,
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input logic StallF, StallD, StallE, FlushF, FlushD, FlushE,
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input logic [`XLEN-1:0] LookUpPC,
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output logic [`XLEN-1:0] TargetPC,
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output logic [3:0] InstrClass,
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@ -58,7 +59,7 @@ module BTBPredictor
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flopenr #(Depth) UpdatePCIndexReg(.clk(clk),
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.reset(reset),
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.en(1'b1),
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.en(~StallE),
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.d(UpdatePCIndex),
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.q(UpdatePCIndexQ));
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@ -66,18 +67,33 @@ module BTBPredictor
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always_ff @ (posedge clk) begin
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if (reset) begin
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ValidBits <= #1 {TotalDepth{1'b0}};
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end else if (UpdateEN) begin
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end else
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if (UpdateEN) begin
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ValidBits[UpdatePCIndexQ] <= #1 1'b1;
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end
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end
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assign Valid = ValidBits[LookUpPCIndexQ];
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/* -----\/----- EXCLUDED -----\/-----
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regfile2p1r1w #(10, 1) validMem(.clk(clk),
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.reset(reset),
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.RA1(LookUpPCIndexQ),
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.RD1(Valid),
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.REN1(1'b1),
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.WA1(UpdatePCIndexQ),
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.WD1(1'b1),
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.WEN1(UpdateEN));
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-----/\----- EXCLUDED -----/\----- */
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flopenr #(Depth) LookupPCIndexReg(.clk(clk),
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.reset(reset),
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.en(1'b1),
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.en(~StallF),
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.d(LookUpPCIndex),
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.q(LookUpPCIndexQ));
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assign Valid = ValidBits[LookUpPCIndexQ];
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// the BTB contains the target address.
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// Another optimization may be using a PC relative address.
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@ -87,7 +103,7 @@ module BTBPredictor
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.reset(reset),
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.RA1(LookUpPCIndex),
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.RD1({{InstrClass, TargetPC}}),
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.REN1(1'b1),
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.REN1(~StallF),
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.WA1(UpdatePCIndex),
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.WD1({UpdateInstrClass, UpdateTarget}),
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.WEN1(UpdateEN),
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@ -121,6 +121,7 @@ module bpred
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BTBPredictor TargetPredictor(.clk(clk),
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.reset(reset),
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.*, // Stalls and flushes
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.LookUpPC(PCNextF),
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.TargetPC(BTBPredPCF),
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.InstrClass(BPInstrClassF),
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Block a user