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Begin commenting divsqrt

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Cedar Turek 2022-12-30 10:43:02 -08:00
parent 668c698bb4
commit d19192144b
1 changed files with 32 additions and 16 deletions
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48
pipelined/src/fpu/fdivsqrt/fdivsqrt.sv
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@ -56,6 +56,8 @@ module fdivsqrt(
// output logic [`XLEN-1:0] RemM,
);
// Floating-point division and square root module, with optional integer division and remainder
logic [`DIVb+3:0] WS, WC;
logic [`DIVb+3:0] X;
logic [`DIVb-1:0] D;
@ -63,29 +65,43 @@ module fdivsqrt(
logic [`DIVb:0] FirstU, FirstUM;
logic [`DIVb+1:0] FirstC;
logic Firstun;
logic WZeroE, AZeroM, BZeroM, AZeroE, BZeroE;
logic SpecialCaseM, MDUM;
logic WZeroE;
logic SpecialCaseM;
logic DivStartE;
// Integer div/rem signals
logic AZeroM, BZeroM, AZeroE, BZeroE, MDUM;
logic [`DIVBLEN:0] nE, nM, mM;
logic NegQuotM, ALTBM, AsM, W64M;
logic DivStartE;
logic [`XLEN-1:0] AM;
fdivsqrtpreproc fdivsqrtpreproc(
.clk, .IFDivStartE, .Xm(XmE), .QeM, .Xe(XeE), .Fmt(FmtE), .Ye(YeE),
.Sqrt(SqrtE), .Ym(YmE), .XZeroE, .X, .DPreproc, .AM, .MDUM, .W64M,
.nE, .nM, .mM, .NegQuotM, .ALTBM, .AZeroM, .BZeroM, .AZeroE, .BZeroE, .AsM,
.ForwardedSrcAE, .ForwardedSrcBE, .Funct3E, .MDUE, .W64E);
fdivsqrtfsm fdivsqrtfsm(
.clk, .reset, .FmtE, .XsE, .SqrtE, .nE,
.FDivBusyE, .FDivStartE, .IDivStartE, .IFDivStartE, .FDivDoneE, .StallM, .FlushE,
.XZeroE, .YZeroE, .AZeroE, .BZeroE,
.XNaNE, .YNaNE, .MDUE,
.XInfE, .YInfE, .WZeroE, .SpecialCaseM);
fdivsqrtiter fdivsqrtiter(
fdivsqrtpreproc fdivsqrtpreproc( // Preprocessor
// Inputs
.clk, .IFDivStartE, .Xm(XmE), .Ym(YmE), .Xe(XeE), .Ye(YeE),
.Fmt(FmtE), .Sqrt(SqrtE), .XZeroE, .Funct3E,
// Int-specific Inputs
.ForwardedSrcAE, .ForwardedSrcBE, .MDUE, .W64E,
// Outputs
.QeM, .X, .DPreproc,
// Int-specific Outputs
.AZeroE, .BZeroE, .nE,
.AZeroM, .BZeroM, .nM, .mM, .AM,
.MDUM, .W64M, .NegQuotM, .ALTBM, .AsM);
fdivsqrtfsm fdivsqrtfsm( // FSM
// Inputs
.clk, .reset, .FmtE, .XInfE, .YInfE,
.XZeroE, .YZeroE, .XNaNE, .YNaNE,
.FDivStartE, .XsE, .SqrtE, .WZeroE,
.FlushE, .StallM,
// Int-specific Inputs
.IDivStartE, .AZeroE, .BZeroE, .nE, .MDUE,
// Outputs
.FDivBusyE, .IFDivStartE, .FDivDoneE, .SpecialCaseM);
fdivsqrtiter fdivsqrtiter( // CSA Iterator
.clk, .Firstun, .D, .FirstU, .FirstUM, .FirstC, .SqrtE,
.X,.DPreproc, .FirstWS(WS), .FirstWC(WC),
.IFDivStartE, .FDivBusyE);
fdivsqrtpostproc fdivsqrtpostproc(
fdivsqrtpostproc fdivsqrtpostproc( // Postprocessor
.clk, .reset, .StallM,
.WS, .WC, .D, .FirstU, .FirstUM, .FirstC, .SqrtE, .Firstun,
.SqrtM, .SpecialCaseM, .RemOpM(Funct3M[1]), .AM,