Subversion Repositories wisbone_2_ahb

//******************************************************************************************************
// Copyright (c) 2007 TooMuch Semiconductor Solutions Pvt Ltd.


//File name             :       wb_ahb_stim_gen.svh
//Date                  :        Aug, 2007
//Description           :       Stimulus Generation for WISHBONE_AHB Bridge
//Revision              :       1.0

//******************************************************************************************************

// class to generate write and read packet
import avm_pkg::*;
import global::*;
class wb_ahb_stim_gen extends avm_named_component;


avm_blocking_put_port#( wb_req_pkt) initiator_port;
tlm_fifo#(wb_req_pkt) fifo;

        function new(string name ,avm_named_component parent);
                super.new(name,parent);
                initiator_port=new("initiatot_port",this);
                fifo =new("fifo",this);
        endfunction

task stimulus(input int count = 41);

        wb_req_pkt p;
//*****************************************
//Write operations with no wait states
//*****************************************
                for(int i=0; i<8 ;i++)
                begin
                                p.wr='b1;
                                p.adr=i+1;      
                                p.dat=i;        
                                p.stb='b1;      
                                write_to_pipe(p);
                end

//************************************************
//Write operations with wait states from AHB Slave
//************************************************
                for(int i=8;i<10;i++)
                begin
                                p.wr='b1;//Wait state from AHB SLAVE
                                p.stb='b1;
                                write_to_pipe(p);
                end

//*****************************************
//Write operations with no wait states
//*****************************************
                for(int i=10; i<14 ;i++)
                begin
                                p.wr='b1;
                                p.adr=i+1;      
                                p.dat=i;
                                p.stb='b1;
                                write_to_pipe(p);
                end

//***********************************************
//Write operations with wait states from WB Master
//***********************************************
                for(int i=14;i<16;i++)
                begin
                                p.stb='b0;
                                p.wr='b1;//Wait state from AHB SLAVE
                write_to_pipe(p);
                end

//*****************************************
//Write operations with no wait states
//*****************************************
                for(int i=15; i<19 ;i++)
                begin
                                p.wr='b1;
                                p.adr=i+1;      
                                p.dat=i;
                                p.stb='b1;      
                                write_to_pipe(p);
                end

//*************************************
//Read operations without wait states
//*************************************
                for(int i=19; i<25 ;i++)
                begin
                                p.wr='b0;
                                p.adr=i+1;
                                p.stb='b1;      
                                write_to_pipe(p);
                end

//**********************************************
//Read operations with wait states from AHB Slave
//**********************************************
                for(int i=25; i<27 ;i++)
                begin
                                p.wr='b0;
                write_to_pipe(p);
                end
//*************************************
//Read operations without wait states
//*************************************
                for(int i=27; i<31 ;i++)
                begin
                                p.wr='b0;
                                p.adr=$random;  
                                $display("%0d, %0d", p.wr, p.adr );
                write_to_pipe(p);
                end
//**********************************************
//Read operations with wait states from WB Master
//**********************************************
                for(int i=31; i<33 ;i++)
                begin
                                p.wr='b0;
                write_to_pipe(p);
                end
//*************************************
//Read operations without wait states
//*************************************
                for(int i=33; i<38 ;i++)
                begin
                                p.wr='b0;
                                p.adr=$random;  
                                $display("%0d, %0d",p.wr, p.adr );
                write_to_pipe(p);
                end
//*****************************************
//Write operations with no wait states
//*****************************************
                for(int i=38; i<41 ;i++)
                begin
                                p.wr='b1;
                                p.adr=$random;  
                                p.dat=$random;  
                                $display("%0d, %0d", p.adr , p.dat );
                write_to_pipe(p);
                end 

endtask

// task to push transaction in the fifo
task write_to_pipe(wb_req_pkt p);
                initiator_port.put(p);
endtask

endclass