diff --git a/src/ieu/ieu.sv b/src/ieu/ieu.sv index 38d50e3c3..65a43db5b 100644 --- a/src/ieu/ieu.sv +++ b/src/ieu/ieu.sv @@ -28,85 +28,97 @@ //////////////////////////////////////////////////////////////////////////////////////////////// module ieu import cvw::*; #(parameter cvw_t P) ( - input logic clk, reset, + input logic clk, reset, // Decode stage signals - input logic [31:0] InstrD, // Instruction - input logic [1:0] STATUS_FS, // is FPU enabled? - input logic [3:0] ENVCFG_CBE, // Cache block operation enables - input logic IllegalIEUFPUInstrD, // Illegal instruction - output logic IllegalBaseInstrD, // Illegal I-type instruction, or illegal RV32 access to upper 16 registers + input logic [31:0] InstrD, // Instruction + input logic [1:0] STATUS_FS, // is FPU enabled? + input logic [3:0] ENVCFG_CBE, // Cache block operation enables + input logic IllegalIEUFPUInstrD, // Illegal instruction + output logic IllegalBaseInstrD, // Illegal I-type instruction, or illegal RV32 access to upper 16 registers // Execute stage signals - input logic [P.XLEN-1:0] PCE, // PC - input logic [P.XLEN-1:0] PCLinkE, // PC + 4 - output logic PCSrcE, // Select next PC (between PC+4 and IEUAdrE) - input logic FWriteIntE, FCvtIntE, // FPU writes to integer register file, FPU converts float to int - output logic [P.XLEN-1:0] IEUAdrE, // Memory address - output logic IntDivE, W64E, // Integer divide, RV64 W-type instruction - output logic [2:0] Funct3E, // Funct3 instruction field - output logic [P.XLEN-1:0] ForwardedSrcAE, ForwardedSrcBE, // ALU src inputs before the mux choosing between them and PCE to put in srcA/B - output logic [4:0] RdE, // Destination register - output logic MDUActiveE, // Mul/Div instruction being executed - output logic [3:0] CMOpM, // 1: cbo.inval; 2: cbo.flush; 4: cbo.clean; 8: cbo.zero - output logic IFUPrefetchE, // instruction prefetch - output logic LSUPrefetchM, // datata prefetch - // Memory stage signals - input logic SquashSCW, // Squash store conditional, from LSU - output logic [1:0] MemRWE, // Read/write control goes to LSU - output logic [1:0] MemRWM, // Read/write control goes to LSU - output logic [1:0] AtomicM, // Atomic control goes to LSU - output logic [P.XLEN-1:0] WriteDataM, // Write data to LSU - output logic [2:0] Funct3M, // Funct3 (size and signedness) to LSU - output logic [P.XLEN-1:0] SrcAM, // ALU SrcA to Privileged unit and FPU - output logic [4:0] RdM, // Destination register - input logic [P.XLEN-1:0] FIntResM, // Integer result from FPU (fmv, fclass, fcmp) - output logic InvalidateICacheM, FlushDCacheM, // Invalidate I$, flush D$ - output logic InstrValidD, InstrValidE, InstrValidM, // Instruction is valid - output logic BranchD, BranchE, - output logic JumpD, JumpE, + input logic [P.XLEN-1:0] PCE, // PC + input logic [P.XLEN-1:0] PCLinkE, // PC + 4 + output logic PCSrcE, // Select next PC (between PC+4 and IEUAdrE) + input logic FWriteIntE, FCvtIntE, // FPU writes to integer register file, FPU converts float to int + output logic [P.XLEN-1:0] IEUAdrE, // Memory address + output logic IntDivE, W64E, // Integer divide, RV64 W-type instruction + output logic [2:0] Funct3E, // Funct3 instruction field + output logic [P.XLEN-1:0] ForwardedSrcAE, ForwardedSrcBE, // ALU src inputs before the mux choosing between them and PCE to put in srcA/B + output logic [4:0] RdE, // Destination register + output logic MDUActiveE, // Mul/Div instruction being executed + output logic [3:0] CMOpM, // 1: cbo.inval; 2: cbo.flush; 4: cbo.clean; 8: cbo.zero + output logic IFUPrefetchE, // instruction prefetch + output logic LSUPrefetchM, // datata prefetch + // Memory stage signals + input logic SquashSCW, // Squash store conditional, from LSU + output logic [1:0] MemRWE, // Read/write control goes to LSU + output logic [1:0] MemRWM, // Read/write control goes to LSU + output logic [1:0] AtomicM, // Atomic control goes to LSU + output logic [P.XLEN-1:0] WriteDataM, // Write data to LSU + output logic [2:0] Funct3M, // Funct3 (size and signedness) to LSU + output logic [P.XLEN-1:0] SrcAM, // ALU SrcA to Privileged unit and FPU + output logic [4:0] RdM, // Destination register + input logic [P.XLEN-1:0] FIntResM, // Integer result from FPU (fmv, fclass, fcmp) + output logic InvalidateICacheM, FlushDCacheM, // Invalidate I$, flush D$ + output logic InstrValidD, InstrValidE, InstrValidM, // Instruction is valid + output logic BranchD, BranchE, + output logic JumpD, JumpE, // Writeback stage signals - input logic [P.XLEN-1:0] FIntDivResultW, // Integer divide result from FPU fdivsqrt) - input logic [P.XLEN-1:0] CSRReadValW, // CSR read value, - input logic [P.XLEN-1:0] MDUResultW, // multiply/divide unit result - input logic [P.XLEN-1:0] FCvtIntResW, // FPU's float to int conversion result - input logic FCvtIntW, // FPU converts float to int - output logic [4:0] RdW, // Destination register - input logic [P.XLEN-1:0] ReadDataW, // LSU's read data + input logic [P.XLEN-1:0] FIntDivResultW, // Integer divide result from FPU fdivsqrt) + input logic [P.XLEN-1:0] CSRReadValW, // CSR read value, + input logic [P.XLEN-1:0] MDUResultW, // multiply/divide unit result + input logic [P.XLEN-1:0] FCvtIntResW, // FPU's float to int conversion result + input logic FCvtIntW, // FPU converts float to int + output logic [4:0] RdW, // Destination register + input logic [P.XLEN-1:0] ReadDataW, // LSU's read data // Hazard unit signals - input logic StallD, StallE, StallM, StallW, // Stall signals from hazard unit - input logic FlushD, FlushE, FlushM, FlushW, // Flush signals - output logic StructuralStallD, // IEU detects structural hazard in Decode stage - output logic LoadStallD, // Structural stalls for load, sent to performance counters - output logic StoreStallD, // load after store hazard - output logic CSRReadM, CSRWriteM, PrivilegedM,// CSR read, CSR write, is privileged instruction - output logic CSRWriteFenceM // CSR write or fence instruction needs to flush subsequent instructions + input logic StallD, StallE, StallM, StallW, // Stall signals from hazard unit + input logic FlushD, FlushE, FlushM, FlushW, // Flush signals + output logic StructuralStallD, // IEU detects structural hazard in Decode stage + output logic LoadStallD, // Structural stalls for load, sent to performance counters + output logic StoreStallD, // load after store hazard + output logic CSRReadM, CSRWriteM, PrivilegedM, // CSR read, CSR write, is privileged instruction + output logic CSRWriteFenceM, // CSR write or fence instruction needs to flush subsequent instructions + // Debug scan chain + input logic DebugScanEn, + input logic DebugScanIn, + output logic DebugScanOut, + // GPR debug scan chain + input logic GPRSel, + input logic DebugCapture, + input logic DebugGPRUpdate, + input logic [P.E_SUPPORTED+3:0] GPRAddr, + input logic GPRScanEn, + input logic GPRScanIn, + output logic GPRScanOut ); - logic [2:0] ImmSrcD; // Select type of immediate extension - logic [1:0] FlagsE; // Comparison flags ({eq, lt}) - logic ALUSrcAE, ALUSrcBE; // ALU source operands - logic [2:0] ResultSrcW; // Selects result in Writeback stage - logic ALUResultSrcE; // Selects ALU result to pass on to Memory stage - logic [2:0] ALUSelectE; // ALU select mux signal - logic SCE; // Store Conditional instruction - logic FWriteIntM; // FPU writing to integer register file - logic IntDivW; // Integer divide instruction - logic [3:0] BSelectE; // Indicates if ZBA_ZBB_ZBC_ZBS instruction in one-hot encoding - logic [3:0] ZBBSelectE; // ZBB Result Select Signal in Execute Stage - logic [2:0] BALUControlE; // ALU Control signals for B instructions in Execute Stage - logic SubArithE; // Subtraction or arithmetic shift + logic [2:0] ImmSrcD; // Select type of immediate extension + logic [1:0] FlagsE; // Comparison flags ({eq, lt}) + logic ALUSrcAE, ALUSrcBE; // ALU source operands + logic [2:0] ResultSrcW; // Selects result in Writeback stage + logic ALUResultSrcE; // Selects ALU result to pass on to Memory stage + logic [2:0] ALUSelectE; // ALU select mux signal + logic SCE; // Store Conditional instruction + logic FWriteIntM; // FPU writing to integer register file + logic IntDivW; // Integer divide instruction + logic [3:0] BSelectE; // Indicates if ZBA_ZBB_ZBC_ZBS instruction in one-hot encoding + logic [3:0] ZBBSelectE; // ZBB Result Select Signal in Execute Stage + logic [2:0] BALUControlE; // ALU Control signals for B instructions in Execute Stage + logic SubArithE; // Subtraction or arithmetic shift logic [6:0] Funct7E; // Forwarding signals logic [4:0] Rs1D, Rs2D; - logic [4:0] Rs2E; // Source registers - logic [1:0] ForwardAE, ForwardBE; // Select signals for forwarding multiplexers - logic RegWriteM, RegWriteW; // Register will be written in Memory, Writeback stages - logic MemReadE, CSRReadE; // Load, CSRRead instruction - logic BranchSignedE; // Branch does signed comparison on operands - logic MDUE; // Multiply/divide instruction - logic BMUActiveE; // Bit manipulation instruction being executed - logic [1:0] CZeroE; // {czero.nez, czero.eqz} instructions active + logic [4:0] Rs2E; // Source registers + logic [1:0] ForwardAE, ForwardBE; // Select signals for forwarding multiplexers + logic RegWriteM, RegWriteW; // Register will be written in Memory, Writeback stages + logic MemReadE, CSRReadE; // Load, CSRRead instruction + logic BranchSignedE; // Branch does signed comparison on operands + logic MDUE; // Multiply/divide instruction + logic BMUActiveE; // Bit manipulation instruction being executed + logic [1:0] CZeroE; // {czero.nez, czero.eqz} instructions active controller #(P) c( .clk, .reset, .StallD, .FlushD, .InstrD, .STATUS_FS, .ENVCFG_CBE, .ImmSrcD, @@ -120,13 +132,14 @@ module ieu import cvw::*; #(parameter cvw_t P) ( .StallM, .FlushM, .MemRWE, .MemRWM, .CSRReadM, .CSRWriteM, .PrivilegedM, .AtomicM, .Funct3M, .RegWriteM, .FlushDCacheM, .InstrValidM, .InstrValidE, .InstrValidD, .FWriteIntM, .StallW, .FlushW, .RegWriteW, .IntDivW, .ResultSrcW, .CSRWriteFenceM, .InvalidateICacheM, - .RdW, .RdE, .RdM); - + .RdW, .RdE, .RdM, .DebugScanEn, .DebugScanIn, .DebugScanOut(DSCR)); + datapath #(P) dp( .clk, .reset, .ImmSrcD, .InstrD, .Rs1D, .Rs2D, .Rs2E, .StallE, .FlushE, .ForwardAE, .ForwardBE, .W64E, .SubArithE, .Funct3E, .Funct7E, .ALUSrcAE, .ALUSrcBE, .ALUResultSrcE, .ALUSelectE, .JumpE, .BranchSignedE, .PCE, .PCLinkE, .FlagsE, .IEUAdrE, .ForwardedSrcAE, .ForwardedSrcBE, .BSelectE, .ZBBSelectE, .BALUControlE, .BMUActiveE, .CZeroE, .StallM, .FlushM, .FWriteIntM, .FIntResM, .SrcAM, .WriteDataM, .FCvtIntW, .StallW, .FlushW, .RegWriteW, .IntDivW, .SquashSCW, .ResultSrcW, .ReadDataW, .FCvtIntResW, - .CSRReadValW, .MDUResultW, .FIntDivResultW, .RdW); + .CSRReadValW, .MDUResultW, .FIntDivResultW, .RdW, .DebugScanEn, .DebugScanIn(DSCR), .DebugScanOut, + .GPRSel, .DebugCapture, .DebugGPRUpdate, .GPRAddr, .GPRScanEn, .GPRScanIn, .GPRScanOut); endmodule