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tell me by checking the following code that how can i generate sop for the first element of data_512 and eop for last element of data_512. i have tried in this way but it is not working . sop means start of packet and eop means end of packet
class data_item;
//rand bit sop,eop;
rand bit valid,error;
rand bit[7:0] data_512[7];
rand bit [6:0] length;
rand byte cycles;
constraint normal
{
length inside {[2:63]};
cycles <=128;
}
endclass
typedef enum {min_len,max_len,normal,max_cycles} test;
class states;
rand test case_variable;
endclass
class driver;
virtual interface txintf tx_if;
//mailbox seq_drv;
data_item d_item;
states sta_item;
function new(virtual interface txintf tx_if);
d_item=new();
//seq_drv=new();
sta_item=new();
//this.seq_drv = seq_drv;
this.tx_if =tx_if;
this.d_item = d_item;
endfunction
task run();
int i=0;
logic[7:0] data;
forever
begin
if(tx_if.rst_n==0)
begin
@(posedge tx_if.clk);
tx_if.ocx_out.sop = 0;
tx_if.ocx_out.valid = 0;
tx_if.ocx_out.eop = 0;
tx_if.ocx_out.error = 0;
tx_if.ocx_out.data_8= 0;
//seq_drv.get(d_item);
end
else
begin
assert(d_item.randomize());
tx_if.ocx_out.valid=$random;
foreach(d_item.data_512[i])
begin
if(d_item.valid)
begin
tx_if.ocx_out.data_8 = d_item.data_512[i];
if(d_item.data_512[0])
tx_if.ocx_out.sop = 1;
else
tx_if.ocx_out.sop=0;
if(d_item.data_512[7])
tx_if.ocx_out.eop=1;
else
tx_if.ocx_out.eop=1;
end
end
end
//end
//endcase
$display("clk=%d,rst_n=%d,sop=%d,valid=%d,eop=%d,error=%d,data=%d",tx_if.clk,tx_if.rst_n,tx_if.ocx_out.sop,tx_if.ocx_out.valid,tx_if.ocx_out.eop,tx_if.ocx_out.error,tx_if.ocx_out.data_8);
end
endtask
endclass