class stimulus;
logic [2:0]opcode;
logic [7:0] op1,op2;
task gen;
op1 = $random;
op2 = 'd8;
opcode = $random;
#1 stimulus_vectors();
op1 = 0;
op2 = $random;
opcode = opcode + 1'b1;
#1 stimulus_vectors();
op1 = $random;
op2 = ~op1;
opcode = 3;
#1 stimulus_vectors();
op1 = $random;
op2 = $random;
opcode = $random;
#1 stimulus_vectors();
endtask
task stimulus_vectors();
$display("stimulus vector is : at %g",$time);
$display("[Stimulus]:stimulus is generated :: op1 = %d , op2 = %d , opcode = %d",op1,op2,opcode);
endtask
endclass
i want to put the messages in the mailbox for all the changes in the inputs.
i .e. i m changing my inputs for every #1 so i want to put these in mailbox.
i have tried like this below code, where my last value is put in the mailbox :
(i’m unable to break the gen task in between to access my mailbox. can we do this ? if so how can this be done)
class generator;
stimulus sti;
mailbox m_box;
function new(mailbox m_box);
this.m_box = m_box;
endfunction
task run();
repeat(5) begin
sti = new();
sti.gen();
m_box.put(sti);
$display("message is put into mailbox at %g %d",$time,m_box.num());
end
endtask
endclass
have u tried by declaring mailbox of stimulus class type? if not please try it and let me know.
In reply to shreebamnikar :
how can i do that ? can you please guide me
dave_59
September 20, 2016, 5:12am
4
*In reply to sreelaxmi : *You should always parameterize your mailbox with the type of item being put/get.
mailbox #(stimulus) m_box;
function new(mailbox #(stimulus) m_box);
this.m_box = m_box;
endfunction
But this is not your problem. You need to show us what you expect to happen to your inputs and you need to show who does the get(). What you are doing does not make much sense. Normally, your class ‘stimulus’ represents one set of values for (opcode,op1,o2) and create an class object for each set. The each object goes onto the mailbox.
In reply to sreelaxmi :
You want something like this?
class stimulus;
logic [2:0]opcode;
logic [7:0] op1,op2;
//Store messages here
string message;
//Create constructor and pass mailbox
//...
mailbox#(string) msg_mbx;
//..
task gen;
op1 = $random;
op2 = 'd8;
opcode = $random;
#1 stimulus_vectors();
op1 = 0;
op2 = $random;
opcode = opcode + 1'b1;
#1 stimulus_vectors();
op1 = $random;
op2 = ~op1;
opcode = 3;
#1 stimulus_vectors();
op1 = $random;
op2 = $random;
opcode = $random;
#1 stimulus_vectors();
endtask //gen
task stimulus_vectors();
$display("stimulus vector is : at %g",$time);
$display("[Stimulus]:stimulus is generated :: op1 = %d , op2 = %d , opcode = %d",op1,op2,opcode);
//Store message into mailbox
message = $sformatf("[Stimulus]:stimulus is generated :: op1 = %d , op2 = %d , opcode = %d",op1,op2,opcode);
msg_mbx.put(message);
endtask //stimulus_vectors
endclass //stimulus
In reply to dave_59 :
i’m learning how mailboxes work so as an example i have considered an alu block and by using mailbox im accessing the inputs.
i want to access my mailbox everytime my inputs(opcode op1,op2 ) changes at #1 time .
class driver;
stimulus sti;
mailbox m_box;
//constructor, getting mailbox handle
function new(mailbox m_box);
this.m_box = m_box;
endfunction
task run;
repeat(5) begin
m_box.get(sti); //getting stimulus from mailbox
$display("Driver:: stimulus is received at %g",$time);
$display("[Driver]:stimulus is generated :: op1 = %d , op2 = %d , opcode = %d %d",sti.op1,sti.op2,sti.opcode,m_box.num());
end
endtask
endclass
In reply to mayurkubavat :
In reply to sreelaxmi :
class stimulus;
logic [2:0]opcode;
logic [7:0] op1,op2;
//Store messages here
string message;
//Create constructor and pass mailbox
//...
mailbox#(string) msg_mbx;
//..
task gen;
op1 = $random;
op2 = 'd8;
opcode = $random;
#1 stimulus_vectors();
op1 = 0;
op2 = $random;
opcode = opcode + 1'b1;
#1 stimulus_vectors();
op1 = $random;
op2 = ~op1;
opcode = 3;
#1 stimulus_vectors();
op1 = $random;
op2 = $random;
opcode = $random;
#1 stimulus_vectors();
endtask //gen
task stimulus_vectors();
$display("stimulus vector is : at %g",$time);
$display("[Stimulus]:stimulus is generated :: op1 = %d , op2 = %d , opcode = %d",op1,op2,opcode);
//Store message into mailbox
message = $sformatf("[Stimulus]:stimulus is generated :: op1 = %d , op2 = %d , opcode = %d",op1,op2,opcode);
msg_mbx.put(message);
endtask //stimulus_vectors
endclass //stimulus
class type doesnot allow string type message
In reply to dave_59 :
*In reply to sreelaxmi : *You should always parameterize your mailbox with the type of item being put/get.
mailbox #(stimulus) m_box;
function new(mailbox #(stimulus) m_box);
this.m_box = m_box;
endfunction
But this is not your problem. You need to show us what you expect to happen to your inputs and you need to show who does the get(). What you are doing does not make much sense. Normally, your class ‘stimulus’ represents one set of values for (opcode,op1,o2) and create an class object for each set. The each object goes onto the mailbox.
stimulus vector is : at 1
i want my driver output to work at every #1
In reply to sreelaxmi :
then u have to create one diver handle and call driver run task . in initial block like drv.run.
In reply to shreebamnikar :
`timescale 1 ns/ 100 ps
//`include "test.sv"
`include "stimulu.sv"
`include "generator.sv"
`include "driver.sv"
module test_top();
generator gen;
mailbox #(stimulus)m_box;
driver dri;
initial begin
m_box = new();
gen = new(m_box);
dri = new(m_box);
fork
gen.run();
dri.run();
join
#1000 $finish ;
end
endmodule:test_top
hi,
module tbtop;
wire clk;
wire [319:0]driver_out;
wire [255:0]pkt1;
reg rst_n;
initial
begin
rst_n = 0 ;
#5ns;
rst_n =1 ;
end
clkgen cg(.clk(clk));
driver drvr(.clk(clk),.pkt1(pkt1),.driver_out(driver_out));
generator gen(.clk(clk),.pkt1(pkt1));
endmodule
// clock generator
module clkgen(clk);
output reg clk;
initial begin
clk = 0;
end
always #5 clk = ~clk;
endmodule
// Code your design here
module driver(clk,pkt1,driver_out);
input clk;
// bit trans;
input [255:0]pkt1;
output reg [319:0]driver_out;
bit [15:0]pkt_length;
bit [255:0]ipv4_pkt;
bit [255:0]ipv6_pkt;
bit [255:0]vlan_pkt;
bit [31:0]outcrc1;
bit [1:0]pkt_type;
bit [55:0]preamble ='h5a5a5a5a5a5a5a;
bit [7:0]spd = 'h5d;
reg [319:0]dri_out;
int i;
generator g1();
mailbox mbx = new();
initial begin // trans =1;
g1.gen_pkt(0);
// mbx.get(pkt1);
$display("pkt1=%h",g1.pkt1);
dri_out = {preamble[55:0],spd[7:0],g1.pkt1[255:0]};
$display("dri_out=%0h",dri_out);
for (i=0;i<40;i=i+1) begin
@(posedge clk) driver_out = dri_out[i*8 +: 7];
$display("driver_out=%0h",driver_out);
end
end
endmodule
module generator(clk,pkt1);
input clk;
output reg [255:0]pkt1;
bit[255:0] pkt;
bit[15:0]pkt_length;
bit[255:0]ipv4_pkt;
bit[255:0]ipv6_pkt;
bit[255:0]vlan_pkt;
bit [31:0]outcrc1;
bit [1:0]pkt_type;
//mailbox mbx = new();
// mbx.put(pkt1);
task gen_pkt(input [1:0]pkt_type);
case(pkt_type)
'd0 : begin
pkt_length = 'h256;
for(int i=0; i<256; i++) begin
ipv4_pkt[i*8 +: 7] = $random;
end
pkt[255:0] ={pkt_length, ipv4_pkt[239:0]};
$display("value of pkt=%0h",pkt);
outcrc1 = gen_crc(pkt_length,pkt);
pkt1[255:0] = {pkt_length, pkt[207:0], outcrc1};
$display("value of pkt1=%0h",pkt1);
end
'd1 : begin
pkt_length = 'h256;
for(int i=0; i<256; i++) begin
ipv6_pkt[i*8 +: 7] = $random;
end
pkt[255:0] = {pkt_length, ipv6_pkt[239:0]};
$display("value of pkt=%0h",pkt);
outcrc1 = gen_crc(pkt_length,pkt);
pkt1[255:0] = { pkt_length,pkt[207:0],outcrc1};
$display("value of pkt1=%0h",pkt1);
end
'd2 : begin
pkt_length = 'h256;
for(int i=0; i<256; i++) begin
vlan_pkt[i*8 +: 7] = $random;
end
pkt[255:0] = {pkt_length, vlan_pkt[239:0]};
$display("value of pkt=%0h",pkt);
outcrc1 = gen_crc(pkt_length,pkt);
pkt1[255:0] = {pkt_length, pkt[207:0],outcrc1};
$display("value of pkt1=%0h",pkt1);
end
endcase
endtask
function [31:0] gen_crc(input [15:0]length,input [255:0]pkt);
bit [7:0] d;
bit [31:0] crc, c, temp_crc;
int i;
for (i=0; i<length; i++) begin
d = pkt[i*8 +: 7];
crc[0] = d[6] ^ d[0] ^ c[24] ^ c[30];
crc[1] = d[7] ^ d[6] ^ d[1] ^ d[0] ^ c[24] ^ c[25] ^ c[30] ^ c[31];
crc[2] = d[7] ^ d[6] ^ d[2] ^ d[1] ^ d[0] ^ c[24] ^ c[25] ^ c[26] ^ c[30] ^ c[31];
crc[3] = d[7] ^ d[3] ^ d[2] ^ d[1] ^ c[25] ^ c[26] ^ c[27] ^ c[31];
crc[4] = d[6] ^ d[4] ^ d[3] ^ d[2] ^ d[0] ^ c[24] ^ c[26] ^ c[27] ^ c[28] ^ c[30];
crc[5] = d[7] ^ d[6] ^ d[5] ^ d[4] ^ d[3] ^ d[1] ^ d[0] ^ c[24] ^ c[25] ^ c[27] ^ c[28] ^ c[29] ^ c[30] ^ c[31];
crc[6] = d[7] ^ d[6] ^ d[5] ^ d[4] ^ d[2] ^ d[1] ^ c[25] ^ c[26] ^ c[28] ^ c[29] ^ c[30] ^ c[31];
crc[7] = d[7] ^ d[5] ^ d[3] ^ d[2] ^ d[0] ^ c[24] ^ c[26] ^ c[27] ^ c[29] ^ c[31];
crc[8] = d[4] ^ d[3] ^ d[1] ^ d[0] ^ c[0] ^ c[24] ^ c[25] ^ c[27] ^ c[28];
crc[9] = d[5] ^ d[4] ^ d[2] ^ d[1] ^ c[1] ^ c[25] ^ c[26] ^ c[28] ^ c[29];
crc[10] = d[5] ^ d[3] ^ d[2] ^ d[0] ^ c[2] ^ c[24] ^ c[26] ^ c[27] ^ c[29];
crc[11] = d[4] ^ d[3] ^ d[1] ^ d[0] ^ c[3] ^ c[24] ^ c[25] ^ c[27] ^ c[28];
crc[12] = d[6] ^ d[5] ^ d[4] ^ d[2] ^ d[1] ^ d[0] ^ c[4] ^ c[24] ^ c[25] ^ c[26] ^ c[28] ^ c[29] ^ c[30];
crc[13] = d[7] ^ d[6] ^ d[5] ^ d[3] ^ d[2] ^ d[1] ^ c[5] ^ c[25] ^ c[26] ^ c[27] ^ c[29] ^ c[30] ^ c[31];
crc[14] = d[7] ^ d[6] ^ d[4] ^ d[3] ^ d[2] ^ c[6] ^ c[26] ^ c[27] ^ c[28] ^ c[30] ^ c[31];
crc[15] = d[7] ^ d[5] ^ d[4] ^ d[3] ^ c[7] ^ c[27] ^ c[28] ^ c[29] ^ c[31];
crc[16] = d[5] ^ d[4] ^ d[0] ^ c[8] ^ c[24] ^ c[28] ^ c[29];
crc[17] = d[6] ^ d[5] ^ d[1] ^ c[9] ^ c[25] ^ c[29] ^ c[30];
crc[18] = d[7] ^ d[6] ^ d[2] ^ c[10] ^ c[26] ^ c[30] ^ c[31];
crc[19] = d[7] ^ d[3] ^ c[11] ^ c[27] ^ c[31];
crc[20] = d[4] ^ c[12] ^ c[28];
crc[21] = d[5] ^ c[13] ^ c[29];
crc[22] = d[0] ^ c[14] ^ c[24];
crc[23] = d[6] ^ d[1] ^ d[0] ^ c[15] ^ c[24] ^ c[25] ^ c[30];
crc[24] = d[7] ^ d[2] ^ d[1] ^ c[16] ^ c[25] ^ c[26] ^ c[31];
crc[25] = d[3] ^ d[2] ^ c[17] ^ c[26] ^ c[27];
crc[26] = d[6] ^ d[4] ^ d[3] ^ d[0] ^ c[18] ^ c[24] ^ c[27] ^ c[28] ^ c[30];
crc[27] = d[7] ^ d[5] ^ d[4] ^ d[1] ^ c[19] ^ c[25] ^ c[28] ^ c[29] ^ c[31];
crc[28] = d[6] ^ d[5] ^ d[2] ^ c[20] ^ c[26] ^ c[29] ^ c[30];
crc[29] = d[7] ^ d[6] ^ d[3] ^ c[21] ^ c[27] ^ c[30] ^ c[31];
crc[30] = d[7] ^ d[4] ^ c[22] ^ c[28] ^ c[31];
crc[31] = d[5] ^ c[23] ^ c[29];
$display("the value of CRC result crc = %h",crc);
c = crc;
end
gen_crc = c;
endfunction
endmodule
Sir,
fork
//begin
producer.fifo_if.write();
consumer.fifo_if.read();
//end
join
task write();
//a=1;
//fork
begin
int i;
i++;
for(i=0;i<10;i++)begin
#10ns;
fifo_if=new();
void'(fifo_if.randomize());
mbx.put(fifo_if);
$display("write data=%0d",fifo_if);
// #10ns;
end
end
endtask
// join
task read();
int a;
//if(a===1)
//fifo_if.write=1;
while(1)begin
mbx.get(fifo_if);
$display("read data=%0d",fifo_if);
end
endtask
output
write data=5