Subversion Repositories ahb2wishbone

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//*****************************************************************************************************************
// Copyright (c) 2007 TooMuch Semiconductor Solutions Pvt Ltd.
//
//File name             :       ahb_wb_monitor.svh      
//Designer              :       Sanjay kumar    
//Date                  :       3rd Aug'2007            
//Description           :       ahb_wb_monitor:Class to monitor transaction on interface and send a copy of monitor 
//                              packets to each subscribers(scoreboard and coverage).
//Revision              :       1.0
//*****************************************************************************************************************
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////

import avm_pkg::*;
import global::*;

class ahb_wb_monitor extends avm_threaded_component;

avm_analysis_port#(monitor_pkt) ap_sb; // analysis port 
monitor_pkt m_pkt;  // instance of packet

local bit flag1;
local bit flag2;

virtual ahb_wb_if pin_if;

        function new(string name ,avm_named_component parent);
                super.new(name,parent);
                ap_sb = new("ap_sb",this);
                pin_if =null;
        endfunction
// task to monitor event on read/write signal
task rdwr;
        forever 
                begin
                @(pin_if.monitor.hwrite);
                flag1='b1;
                end
endtask
// task to monitor event on hready or htrans (wait state)
task wait_ms;
        forever 
                begin
                @(pin_if.monitor.hready or pin_if.monitor.htrans);
                flag2='b1;
                end             
endtask
                
task main_run;
        forever 
        begin
                @(posedge pin_if.monitor.hclk); 
                if((pin_if.monitor.hready) && (pin_if.monitor.htrans == 'b10)) //No wait state
                begin
                        if(pin_if.monitor.hwrite) //write mode
                        begin
                                if(flag1) // first clock
                                begin   
                                        m_pkt.adr1=pin_if.monitor.haddr;
                                        m_pkt.wr='b1;
                                        m_pkt.sel=pin_if.monitor.hready;
                                        m_pkt.mode=pin_if.monitor.htrans;
                                        m_pkt.flag1='b1;
                                        // write packet to scoreboard
                                        ap_sb.write(m_pkt);
                                        flag1='b0;
                                end
                                else
                                begin
                                        m_pkt.adr1=pin_if.monitor.haddr;
                                        m_pkt.dat1=pin_if.monitor.hwdata;
                                        m_pkt.adr2=pin_if.monitor.adr_o;
                                        m_pkt.dat2=pin_if.monitor.dat_o;
                                        m_pkt.wr='b1;
                                        m_pkt.sel=pin_if.monitor.hready;
                                        m_pkt.mode=pin_if.monitor.htrans;
                                        m_pkt.flag1='b0;
                                        m_pkt.flag2=flag2;
                                        ap_sb.write(m_pkt);
                                end
                        end
                        else// read mode
                        begin
                                if(flag1) // first clock
                                begin
                                        m_pkt.adr1=pin_if.monitor.haddr;
                                        m_pkt.wr='b0;
                                        m_pkt.sel=pin_if.monitor.hready;
                                        m_pkt.mode=pin_if.monitor.htrans;
                                        m_pkt.flag1='b1;
                                        //write packet to scoreboard
                                        ap_sb.write(m_pkt);     
                                        flag1='b0;
                                end
                                else
                                begin
                                        m_pkt.adr1=pin_if.monitor.haddr;
                                        m_pkt.dat1=pin_if.monitor.hrdata;
                                        m_pkt.adr2=pin_if.monitor.adr_o;
                                        m_pkt.dat2=pin_if.monitor.dat_i;
                                        m_pkt.wr='b0;
                                        m_pkt.sel=pin_if.monitor.hready;
                                        m_pkt.mode=pin_if.monitor.htrans;
                                        m_pkt.flag1='b0;
                                        m_pkt.flag2=flag2;
                                        // write packet to scoreboard
                                        ap_sb.write(m_pkt);
                                end
                        end
                end
                else // wait state by slave or master
                begin
                        if(pin_if.monitor.hwrite) // write mode 
                        begin
                                if(flag2) // latch the value
                                begin
                                        m_pkt.adr1=pin_if.monitor.haddr;
                                        m_pkt.dat1=pin_if.monitor.hwdata;
                                        m_pkt.adr2=pin_if.monitor.adr_o;
                                        m_pkt.dat2=pin_if.monitor.dat_o;
                                        m_pkt.wr='b1;
                                        m_pkt.sel=pin_if.monitor.hready;
                                        m_pkt.mode=pin_if.monitor.htrans;
                                        m_pkt.flag2='b1;
                                        ap_sb.write(m_pkt);
                                        flag2='b0;
                                end
                                else
                                begin
                                        m_pkt.adr1=pin_if.monitor.haddr;
                                        m_pkt.dat1=pin_if.monitor.hwdata;
                                        m_pkt.adr2=pin_if.monitor.adr_o;
                                        m_pkt.dat2=pin_if.monitor.dat_o;
                                        m_pkt.wr='b1;
                                        m_pkt.sel=pin_if.monitor.hready;
                                        m_pkt.mode=pin_if.monitor.htrans;
                                        m_pkt.flag2='b0;
                                        ap_sb.write(m_pkt);
                                end
                        end
                        else    
                        begin
                                if(flag2) // latch the value
                                begin
                                        m_pkt.adr1=pin_if.monitor.haddr;
                                        m_pkt.dat1=pin_if.monitor.hrdata;
                                        m_pkt.adr2=pin_if.monitor.adr_o;
                                        m_pkt.dat2=pin_if.monitor.dat_i;
                                        m_pkt.wr='b0;
                                        m_pkt.sel=pin_if.monitor.hready;
                                        m_pkt.mode=pin_if.monitor.htrans;
                                        m_pkt.flag2='b1;
                                        ap_sb.write(m_pkt);
                                        flag2='b0;
                                end
                                else
                                begin
                                        m_pkt.adr1=pin_if.monitor.haddr;
                                        m_pkt.dat1=pin_if.monitor.hrdata;
                                        m_pkt.adr2=pin_if.monitor.adr_o;
                                        m_pkt.dat2=pin_if.monitor.dat_i;
                                        m_pkt.wr='b0;
                                        m_pkt.sel=pin_if.monitor.hready;
                                        m_pkt.mode=pin_if.monitor.htrans;
                                        m_pkt.flag2='b0;
                                        ap_sb.write(m_pkt);
                                end
                        end
                end     
        end
endtask 

// run all task simultanoe task 
task run;
        fork
                rdwr();
                wait_ms();
                main_run();
        join
endtask

endclass