Subversion Repositories wisbone_2_ahb

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


//File name             :       wb_ahb_monitor.svh
//Date                  :        Aug, 2007
//Description           :       Monitor for WISHBONE_AHB Bridge
//Revision              :       1.0

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

// monitor class
import avm_pkg::*;
import global::*;
class wb_ahb_monitor extends avm_threaded_component;

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

local bit flag1;
local bit flag2;

virtual wb_ahb_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.we_i);
                $display("Event on Read/Write");
                flag1='b1;
                end
endtask
// task to monitor event on ack_o or stb_i (wait state)
task wait_ms;
        forever 
                begin
                @(pin_if.monitor.stb_i or pin_if.monitor.ack_o);
                flag2='b1;
                end             
endtask

task main_run;
        forever 
        begin
                @(posedge pin_if.monitor.clk_i);        
                $display("At %0d,Values at ahb :%0d, %0d",$time,pin_if.monitor.haddr,pin_if.monitor.hwdata);
                if(pin_if.monitor.stb_i)//No wait state
                   begin
                    if(pin_if.monitor.we_i) //write mode
                        begin
                                if(flag1) // first clock
                                begin   
                                        m_pkt.adr1=pin_if.monitor.addr_i;
                                        m_pkt.wr='b1;
                                        m_pkt.stb=pin_if.monitor.stb_i;
                                        m_pkt.flag1='b1;
                                        // write packet to scoreboard
                                        ap_sb.write(m_pkt);
                                        flag1='b0;
                                end
                                else
                                begin
                                        m_pkt.adr1=pin_if.monitor.addr_i;
                                        m_pkt.dat1=pin_if.monitor.data_i;
                                        m_pkt.adr2=pin_if.monitor.haddr;
                                        m_pkt.dat2=pin_if.monitor.hwdata;
                                        m_pkt.wr='b1;
                                        m_pkt.stb=pin_if.monitor.stb_i;
                                        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.addr_i;
                                        m_pkt.wr='b0;
                                        m_pkt.stb=pin_if.monitor.stb_i;
                                        m_pkt.flag1='b1;
                                        //write packet to scoreboard
                                        ap_sb.write(m_pkt);     
                                        flag1='b0;
                                end
                                else
                                begin
                                        m_pkt.adr1=pin_if.monitor.addr_i;
                                        m_pkt.dat1=pin_if.monitor.data_i;
                                        m_pkt.adr2=pin_if.monitor.haddr;
                                        m_pkt.dat2=pin_if.monitor.hrdata;
                                        m_pkt.wr='b0;
                                        m_pkt.stb=pin_if.monitor.stb_i;
                                        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.we_i) // write mode 
                        begin
                                if(flag2) // latch the value
                                begin
                                        m_pkt.adr1=pin_if.monitor.addr_i;
                                        m_pkt.dat1=pin_if.monitor.data_i;
                                        m_pkt.adr2=pin_if.monitor.haddr;
                                        m_pkt.dat2=pin_if.monitor.hwdata;
                                        m_pkt.wr='b1;
                                        m_pkt.stb=pin_if.monitor.stb_i;
                                        m_pkt.flag2='b1;
                                        ap_sb.write(m_pkt);
                                        flag2='b0;
                                end
                                else
                                begin
                                        m_pkt.adr1=pin_if.monitor.addr_i;
                                        m_pkt.dat1=pin_if.monitor.data_i;
                                        m_pkt.adr2=pin_if.monitor.haddr;
                                        m_pkt.dat2=pin_if.monitor.hwdata;
                                        m_pkt.wr='b1;
                                        m_pkt.stb=pin_if.monitor.stb_i;
                                        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.addr_i;
                                        m_pkt.dat1=pin_if.monitor.data_o;
                                        m_pkt.adr2=pin_if.monitor.haddr;
                                        m_pkt.dat2=pin_if.monitor.hrdata;
                                        m_pkt.wr='b0;
                                        m_pkt.stb=pin_if.monitor.stb_i;
                                        m_pkt.flag2='b1;
                                        ap_sb.write(m_pkt);
                                        flag2='b0;
                                end
                                else
                                begin
                                        m_pkt.adr1=pin_if.monitor.addr_i;
                                        m_pkt.dat1=pin_if.monitor.data_o;
                                        m_pkt.adr2=pin_if.monitor.haddr;
                                        m_pkt.dat2=pin_if.monitor.hrdata;
                                        m_pkt.wr='b0;
                                        m_pkt.stb=pin_if.monitor.stb_i;
                                        m_pkt.flag2='b0;
                                        ap_sb.write(m_pkt);
                                end
                        end
                end
        end     
endtask 

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

endclass