m3s088ct.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                                      //
// Post-Scaler
// Copyright Mentor Graphics Corporation and Licensors 1998.
// V1.000

// m3s088ct.v
// M320C50 CALU Post-scaler.

module m3s088ct (ACC, PostScalerShift, RegCntrl, DMAMode, DataWrite);
//*******************************************************************       //
//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  [31:0] ACC;
    input   [3:0] PostScalerShift;
    input         RegCntrl, DMAMode;
    output [15:0] DataWrite;

  tri [15:0] DataWrite;
  reg [22:0] PostScalerIp;
  reg [18:0] PostScalerA;
  reg [16:0] PostScalerB;
  reg [15:0] PostScalerOp;


// Post-scaler input selector
always @(ACC or PostScalerShift)
    if (PostScalerShift[3]) PostScalerIp = ACC[31:9];
    else PostScalerIp = {ACC[15:0],7'b0};
    
// Accumulator post scaler
always @(PostScalerIp or PostScalerShift)
begin
    if (~PostScalerShift[2]) PostScalerA = PostScalerIp[22:4];
    else PostScalerA = PostScalerIp[18:0];
    if (~PostScalerShift[1]) PostScalerB = PostScalerA[18:2];
    else PostScalerB = PostScalerA[16:0];
    if (~PostScalerShift[0]) PostScalerOp = PostScalerB[16:1];
    else PostScalerOp = PostScalerB[15:0];
end


assign DataWrite = (RegCntrl & ~DMAMode) ? PostScalerOp : 16'bZ;

endmodule