m3s080ct.v

这是16位定点dsp源代码。已仿真和综合过了

//*******************************************************************       //
//IMPORTANT NOTICE                                                          //
//================                                                          //
//Copyright Mentor Graphics Corporation 1996 - 1998.  All rights reserved.  //
//This file and associated deliverables are the trade secrets,              //
//confidential information and copyrighted works of Mentor Graphics         //
//Corporation and its licensors and are subject to your license agreement   //
//with Mentor Graphics Corporation.                                         //
//                                                                          //
//These deliverables may be used for the purpose of making silicon for one  //
//IC design only.  No further use of these deliverables for the purpose of  //
//making silicon from an IC design is permitted without the payment of an   //
//additional license fee.  See your license agreement with Mentor Graphics  //
//for further details.  If you have further questions please contact        //
//Mentor Graphics Customer Support.                                         //
//                                                                          //
//This Mentor Graphics core (m320c50eng v1999.010) was extracted on         //
//workstation hostid 800059c1 Inventra                                      //
// Port Address Incrementer
// Copyright Mentor Graphics Corporation and Licensors 1998. 
// V1.000

// m3s080ct.v
// M320C50 16-bit look-ahead carry incrementer
// for port address incrementer.

module m3s080ct (DataIn, DataOut);
//*******************************************************************       //
//IMPORTANT NOTICE                                                          //
//================                                                          //
//Copyright Mentor Graphics Corporation 1996 - 1998.  All rights reserved.  //
//This file and associated deliverables are the trade secrets,              //
//confidential information and copyrighted works of Mentor Graphics         //
//Corporation and its licensors and are subject to your license agreement   //
//with Mentor Graphics Corporation.                                         //
//                                                                          //
//These deliverables may be used for the purpose of making silicon for one  //
//IC design only.  No further use of these deliverables for the purpose of  //
//making silicon from an IC design is permitted without the payment of an   //
//additional license fee.  See your license agreement with Mentor Graphics  //
//for further details.  If you have further questions please contact        //
//Mentor Graphics Customer Support.                                         //
//                                                                          //
//This Mentor Graphics core (m320c50eng v1999.010) was extracted on         //
//workstation hostid 800059c1 Inventra                                      //
    input  [15:0] DataIn;
    output [15:0] DataOut;

    reg  NPropagate4, NPropagate8, NPropagate12;
    reg  Carry4, Carry8, Carry12;
    wire [15:0] DataOut;

// First 4-bit incrementer stage
assign DataOut[0] = ~DataIn[0];
assign DataOut[1] = DataIn[1] ^ DataIn[0];
assign DataOut[2] = DataIn[2] ^ (DataIn[1] & DataIn[0]); 
assign DataOut[3] = DataIn[3] ^ (DataIn[2] & DataIn[1] & DataIn[0]); 

// Other 4-bit incrementers
m3s081ct U1 (DataIn[7:4], Carry4, DataOut[7:4]);
m3s081ct U2 (DataIn[11:8], Carry8, DataOut[11:8]);
m3s081ct U3 (DataIn[15:12], Carry12, DataOut[15:12]);

// Generate not carry propagate signals for the lower 3 4-bit slices
always @(DataIn)
begin
    NPropagate4 = ~(DataIn[0] & DataIn[1] & DataIn[2] & DataIn[3]);
    NPropagate8 = ~(DataIn[4] & DataIn[5] & DataIn[6] & DataIn[7]);
    NPropagate12 = ~(DataIn[8] & DataIn[9] & DataIn[10] & DataIn[11]);
end

// Look-ahead carry generation
always @(NPropagate4 or NPropagate8 or NPropagate12)
begin
    Carry4 = ~NPropagate4;
    Carry8 = ~(NPropagate8 | NPropagate4);
    Carry12 = ~(NPropagate12 | NPropagate8 | NPropagate4);
end

endmodule