In SV, we use mailbox to get data from different modules and compare the result.

class Scoreboard;
mailbox drvr2sb;
mailbox rcvr2sb;

function new(mailbox drvr2sb,mailbox rcvr2sb);
this.drvr2sb = drvr2sb;
this.rcvr2sb = rcvr2sb;
endfunction:new

task start();
packet pkt_rcv,pkt_exp;
forever
begin
rcvr2sb.get(pkt_rcv);
$display(" %0d : Scorebooard : Scoreboard received a packet from RECEIVER ",$time);
drvr2sb.get(pkt_exp);
if(pkt_rcv.compare(pkt_exp)) 
$display(" %0d : Scoreboardd :Packet Matched ",$time);
else
$root.error++;
end
endtask : start
endclass

In VMM, we use channels to CONNECT all the modules and compare the result.

class Scoreboard extends vmm_xactor;
Packet_channel drvr2sb_chan;
Packet_channel rcvr2sb_chan;

function new(string inst = "class",
INT unsigned stream_id = -1,
Packet_channel drvr2sb_chan = null,
Packet_channel rcvr2sb_chan = null);
super.new("sb",inst,stream_id);
if(drvr2sb_chan == null)
`vmm_fatal(this.log,"drvr2sb_channel is not constructed");
else
this.drvr2sb_chan = drvr2sb_chan;
if(rcvr2sb_chan == null)
`vmm_fatal(this.log,"rcvr2sb_channel is not constructed");
else
this.rcvr2sb_chan = rcvr2sb_chan;
`vmm_note(log,"Scoreboard created ");
endfunction:new

task main();
Packet pkt_rcv,pkt_exp;
string msg;
super.main(); 
forever
begin
rcvr2sb_chan.get(pkt_rcv);
$display(" %0d : Scoreboard : Scoreboard received a packet from receiver ",$time);
drvr2sb_chan.get(pkt_exp);
if(pkt_rcv.compare(pkt_exp,msg)) 
$display(" %0d : Scoreboard :Packet Matched ",$time);
else
`vmm_error(this.log,$psprintf(" Packet MissMatched N %s ",msg));
end
endtask : main
endclass

In SV, we use mailbox to get data from different modules and compare the result.

class Scoreboard;
mailbox drvr2sb;
mailbox rcvr2sb;

function new(mailbox drvr2sb,mailbox rcvr2sb);
this.drvr2sb = drvr2sb;
this.rcvr2sb = rcvr2sb;
endfunction:new

task start();
packet pkt_rcv,pkt_exp;
forever
begin
rcvr2sb.get(pkt_rcv);
$display(" %0d : Scorebooard : Scoreboard received a packet from receiver ",$time);
drvr2sb.get(pkt_exp);
if(pkt_rcv.compare(pkt_exp)) 
$display(" %0d : Scoreboardd :Packet Matched ",$time);
else
$root.error++;
end
endtask : start
endclass

In VMM, we use channels to connect all the modules and compare the result.

class Scoreboard extends vmm_xactor;
Packet_channel drvr2sb_chan;
Packet_channel rcvr2sb_chan;

function new(string inst = "class",
int unsigned stream_id = -1,
Packet_channel drvr2sb_chan = null,
Packet_channel rcvr2sb_chan = null);
super.new("sb",inst,stream_id);
if(drvr2sb_chan == null)
`vmm_fatal(this.log,"drvr2sb_channel is not constructed");
else
this.drvr2sb_chan = drvr2sb_chan;
if(rcvr2sb_chan == null)
`vmm_fatal(this.log,"rcvr2sb_channel is not constructed");
else
this.rcvr2sb_chan = rcvr2sb_chan;
`vmm_note(log,"Scoreboard created ");
endfunction:new

task main();
Packet pkt_rcv,pkt_exp;
string msg;
super.main(); 
forever
begin
rcvr2sb_chan.get(pkt_rcv);
$display(" %0d : Scoreboard : Scoreboard received a packet from receiver ",$time);
drvr2sb_chan.get(pkt_exp);
if(pkt_rcv.compare(pkt_exp,msg)) 
$display(" %0d : Scoreboard :Packet Matched ",$time);
else
`vmm_error(this.log,$psprintf(" Packet MissMatched n %s ",msg));
end
endtask : main
endclass