1. 利用类的继承，将多种test包含进base test中
1.1 改进
(1)将stimulator、monitor、generator、checker的例化、连接、run放入rt_env类中；
(2)genarator_to_stimulator的数据传输语句块放入rt_env类中的task run；
(3)将generate_data_proc产生数据的语句块放入对应的单通道/双通道/多通道测试的类中；
class rt_env; //rt_env包含各个组件的例化、连接、run)
...
endclass
...
endclass
class rt_base_test; //rt_base_test包含rt_env，rt_env包含各个组件
rt_env env;
...
endclass
class rt_single_ch_test extends rt_base_test;//单个通道测试
...
endclass
class rt_two_ch_test extends rt_base_test;//两个通道测试
...
endclass
class rt_two_ch_same_chout_test extends rt_two_ch_test;
...
endclass
class rt_multi_ch_test extends rt_base_test;//多个通道测试
...
endclass
class rt_full_ch_test extends rt_multi_ch_test;
...
endclass
各个class层次结构如下：
1.2 改进后的tb.sv
class rt_packet;
bit [3:0] src;
bit [3:0] dst;
bit [7:0] data [];
function new();
endfunction
function void set_members(bit [3:0]src, bit [3:0]dst, bit[7:0]data []);
this.src = src;
this.dst = dst;
this.data = data;
endfunction
function string sprint();//打印packet信息的函数
sprint = {sprint , $sformatf("src = %0d\n",src)};
sprint = {sprint , $sformatf("dst = %0d\n",dst)};
sprint = {sprint , $sformatf("data_length = %0d\n",data.size())};
foreach(data[i])
sprint = {sprint , $sformatf("data[%0d] = 'h%0x\n", i, data[i])};
endfunction
function bit compare(rt_packet p);//输入exp_pkt
if(dst == p.dst && data == p.data)
compare = 1;
else
compare = 0;
endfunction
endclass
interface rt_interface();
logic clock;
logic reset_n;
logic [15:0] din;
logic [15:0] frame_n;
logic [15:0] valid_n;
logic [15:0] dout;
logic [15:0] valido_n;
logic [15:0] busy_n;
logic [15:0] frameo_n;
endinterface
//********************************** stimulator **********************************//
class rt_stimulator;
virtual rt_interface intf;//class里的接口不能用端口的方式描述，需要添加virtual关键字，在类里面用接口的指针
//for debug purpose from waveform //定义检测状态的变量
typedef enum {DRV_RESET,DRV_IDLE,DRV_ADDR,DRV_PAD,DRV_DATA} drv_state_t;
drv_state_t dbg_state;
byte unsigned dbg_din_chnl0_data;
int src_chnl_status[int]; //关联数组，后面int：src_chnl的number；前面int：dest_chnl的Number ？？
//generator传送p给stimulator
rt_packet pkts[$];//定义stimulator中的的队列pkts
function void put_pkt(input rt_packet p);
pkts.push_back(p); //将generator中传过来的p放入stimulator的pkts中(在pkts队列尾插入p)
endfunction
task run();
fork
drive_reset(); //reset动作
get_packet_and_drive(); //drive_chnl动作
join_none
endtask
task drive_reset();//reset
forever begin
@(negedge intf.reset_n);
dbg_state <= DRV_RESET;
intf.din <= 0;
intf.frame_n <= '1;//等效16'hFFFF
intf.valid_n <= '1;
end
endtask
// 发送数据
task get_packet_and_drive();//drive_chnl
//rt_packet_t p;
@(negedge intf.reset_n);
repeat(10) @(posedge intf.clock);//延迟10个时钟周期
forever begin
automatic rt_packet p;//声明一个动态的
wait(pkts.size()>0);
p = pkts.pop_front(); //将p从队列pkts里面取出
fork//后台触发线程，触发线程在后台运行，继续执行剩下内容
begin
wait_src_chnl_avail(p);//判断src chnl是否被占用，是否需要等待
drive_chnl(p);//从P中拿到发送端口，目标端口，发送数据
set_src_chnl_avail(p);
end
join_none
end
endtask
task wait_src_chnl_avail(rt_packet p);//判断src chnl是否被占用，是否需要等待
if(!src_chnl_status.exists(p.src))//src_chnl_status关联数组里面不含p.src，(表示未占用任何dest_chnl,一开始不满足）
src_chnl_status[p.src] = p.dst;//表示当前正在使用src_chnl,对应dest_chnl就是p.dst（p.src端口在向p.dst端口发送数据）
else if(src_chnl_status[p.src] >= 0)//如果在给0,1,2...dest_chnl发送数据（被占用），需要等待,，否则不需要等待
wait(src_chnl_status[p.src] == -1);//直到src_chnl_status[p.src] == -1(自定义的dest_chnl端口数之外任意的数，表示未占用任何dest_chnl)
endtask
function set_src_chnl_avail(rt_packet p);
src_chnl_status[p.src] = -1;//如果chnl发送完后，把src_chnl置回来(自定义的dest_chnl端口数之外任意的数，表示未占用任何dest_chnl)
endfunction
task drive_chnl(rt_packet p);
$display("@%0t:[DRV] src_chnl[%0d] & dest_chnl[%0d] data trans started with packet: \n%s",$time,p.src,p.dst,p.sprint());
// drive address phase 输入地址位阶段
for(int i=0;i<4;i++)begin //4 clock
@(posedge intf.clock);
dbg_state <=DRV_ADDR;
intf.din[p.src] <= p.dst[i];
intf.valid_n[p.src] <= $urandom_range(0,1); //valid_n在din的地址输入时间段可为任意值x
intf.frame_n[p.src] <= 1'b0; //frame_n需要为低
end
// drive pad phase //隔离阶段
for (int i=0;i<5;i++)begin //5 clock
@(posedge intf.clock);
dbg_state <=DRV_PAD;
intf.din[p.src] <= 1'b1;
intf.valid_n[p.src] <= 1'b1; //valid_n需为高电平
intf.frame_n[p.src] <= 1'b0; //frame_n需为低电平
end
// drive data phase 传输数据阶段
foreach(p.data[id])begin
for(int i=0;i<8;i++)begin
@(posedge intf.clock);
dbg_state <=DRV_DATA;
dbg_din_chnl0_data <= p.data[id];
intf.din[p.src] <= p.data[id][i];
intf.valid_n[p.src] <=1'b0;
intf.frame_n[p.src] <= (id == p.data.size()-1 && i == 7) ? 1'b1 : 1'b0;//packet最后一位输出数据时frameo_n为高
end
end
// drive idle phase 闲置（没有数据传输）阶段
@(posedge intf.clock);
dbg_state <=DRV_IDLE;
dbg_din_chnl0_data <= 0;
intf.din[p.src] <= 1'b0;
intf.valid_n[p.src] <= 1'b1;
intf.frame_n[p.src] <= 1'b1;
$display("@%0t: [DRV]src_chnl[%0d],dest_chnl[%0d] data trans finished",$time,p.src,p.dst);
endtask
endclass
//********************************** generator **********************************//
class rt_generator; //generator产生数据交给stimulator
rt_packet pkts[$]; //定义队列
function void put_pkt(input rt_packet p);
pkts.push_back(p); //将p放入队列pkts里面（在pkts队列尾插入p）
endfunction
task get_pkt(output rt_packet p);
wait(pkts.size() >0 ) //队列不为空
p = pkts.pop_front(); //将p从队列pkts里面取出，提取队列首元素
endtask
//generate a random packet
function void gen_pkt(int src = -1, int dst = -1);
endfunction
task run();
//TODO
endtask
endclass
//********************************** monitor **********************************//
class rt_monitor;
virtual rt_interface intf;
rt_packet in_pkts[16][$];
rt_packet out_pkts[16][$];
task run();
fork
mon_chnls();
join_none
endtask
task mon_chnls;
foreach(in_pkts[i]) begin
automatic int chid = i;
fork
mon_chnl_in(chid);//每个输入端口均调用mon_chnl_in任务，监测数据输入
mon_chnl_out(chid);//每个输出端口均调用mon_chnl_out任务，监测数据输入
join_none
end
endtask
task mon_chnl_in (bit[3:0]id);//监测数据输入的任务
rt_packet pkt; //定义结构体变量
forever begin
//clear content for the same struct variable。清除pkt
pkt = new();
pkt.src = id; //第id个输入端口
//monitor specific channel-in data and put it into the queue
// monitor address phase
@(negedge intf.frame_n[id]);//监测frame_n下降沿(frame_n由时钟驱动)
for(int i=0; i<4; i++)begin
@(negedge intf.clock); //frame_n下降沿后监测4个clk negedge
pkt.dst[i]= intf.din[id];
end
$display ("@%0t: [MON] src_chn1[%0d] & dest_chn1[%0d] data trans started",$time,pkt.src,pkt.dst);
//pass pad phase 不考虑pad阶段是否满足协议要求
repeat(5) @(negedge intf.clock);
do begin
pkt.data = new [pkt.data.size + 1](pkt.data);//创建动态数组并复制pkt.data
for ( int i=0; i<8; i++) begin
@(negedge intf.clock); //在8个clk negedge监测8bit数据
pkt.data[pkt.data.size-1][i] = intf.din[id];
end
end while(!intf.frame_n[id]);
in_pkts[id].push_back(pkt); //将monitor拿到的数据放入in_pkts
$display("@%0t:[MON] CH_IN src_chnl[%0d] &dest_chnl[%0d ] finished with packet: \n%s",$time,pkt.src,pkt.dst,pkt.sprint());
end
endtask
task mon_chnl_out(bit[ 3:0]id);//监测数据输出的任务
rt_packet pkt;
forever begin
//clear content for the same struct variable
pkt = new();
pkt.src = 0;
pkt.dst = id;
@(negedge intf.frameo_n[id]);
$display( "@%0t: [MON] CH_OUT dest_chn1[%0d] data trans started",$time,pkt.dst);
do begin
pkt.data = new [ pkt.data.size + 1](pkt.data);
for(int i=0;i<8; i++) begin
@(negedge intf.clock iff !intf.valido_n[id]);//clock与valido_n信号同时为低
pkt.data[pkt.data.size-1][i]= intf.dout [id];
end
end while(!intf.frameo_n[id]);
out_pkts[id].push_back(pkt);
$display("@%0t: [MON] CH_OUT dest_chn1[%0d] data finished woth packet : \n %s",$time,pkt.dst,pkt.sprint());
//monitor specific channel-out data and put it into the queue
end
endtask
endclass
//********************************** checker **********************************//
class rt_checker;
int unsigned compare_count;
int unsigned error_count;
function new();//赋初值，可有可无，整形变量默认初始值为0
compare_count = 0;
error_count = 0;
endfunction
rt_packet exp_out_pkts[16][$];
rt_monitor mon;
task run();
foreach(exp_out_pkts[i])begin
automatic int chid = i;
fork
do_routing(chid);
do_compare(chid);
join_none
end
endtask
task do_routing(bit[3:0] id);//将monitor中采样到的输入数据放入期望的输出端队列中
rt_packet pkt;
forever begin
wait(mon.in_pkts[id].size > 0);
pkt = mon.in_pkts[id].pop_front();//从monitor中拿到in_pkts队列数据放入pkt
exp_out_pkts[pkt.dst].push_back(pkt);//将pkt数据放入对应期望的dest_chnl
end
endtask
task do_compare(bit[3:0] id);//比较采集的实际输出与期望输出
rt_packet exp_pkt, act_pkt;
forever begin
wait(mon.out_pkts[id].size > 0 && exp_out_pkts[id].size > 0);//实际采样数据与期望数据都有值
act_pkt = mon.out_pkts[id].pop_front();//实际数据为monitor采样的输出数据
exp_pkt = exp_out_pkts[id].pop_front();//期望数据为monitor采样到的输入数据
if(act_pkt.compare(exp_pkt))begin//如果exp_pkt与act_pkt比较成功，返回1
$display("[CHK] data compare success with packet : \n%s",act_pkt.sprint());
end
else begin
$display("[CHK] data compare failure with actual packet : \n%s \nexpected packet : \n%s", act_pkt.sprint(), exp_pkt.sprint());
error_count++;
end
compare_count++;
end
endtask
function void do_report();
$display("TOTAL COMPARING %0d times",compare_count);
if(!error_count)
$display("TEST PASSED!");
else begin
$display("TEST FAILED!");
$display("TOTAL ERROR %0d times", error_count);
end
endfunction
endclass
//********************************** **********************************//
class rt_env; //rt_env包含各个组件
rt_stimulator stim;
rt_monitor mon;
rt_generator gen;
rt_checker chk;
function new(virtual rt_interface intf);
//build stage,例化
stim = new();
gen = new();
mon = new();
chk = new();
//connect sage，连接
stim.intf = intf;
mon.intf = intf;
chk.mon = mon;//check拿monitor句柄，即拿monitor中in_pkts与out_pkts队列
endfunction
task run();
rt_packet p;
//run stage，run
fork
stim.run();//class里面的函数不会自动调用，需要手动调用
gen.run();
mon.run();
chk.run();
begin:genarator_to_stimulator_proc//取出genarator中的数据给stimulator
forever begin //此处不需要延迟0，执行task run的时候默认function new已执行
gen.get_pkt(p); //get句柄
stim.put_pkt(p);//put句柄
end
end
join_none
endtask
endclass
class rt_base_test; //rt_base_test包含rt_env，rt_env包含各个组件
rt_env env;
function new(virtual rt_interface intf);
env = new(intf);
endfunction
task run();
fork
env.run();
join_none
endtask
endclass
class rt_single_ch_test extends rt_base_test;//单个通道测试
function new(virtual rt_interface intf);
env = new(intf);
endfunction
task run();
rt_packet p;
super.run();//调用父类的run，即执行env.run()，进行组件的例化等操作
p = new(); //obj1(每次put_pkt都需要new一下)
p.set_members(0,3,'{8'h33,8'h77});//注意层次变化，在env层次下面
env.gen.put_pkt(p);
p = new(); //obj2
p.set_members(0,5,'{8'h55,8'h66});
env.gen.put_pkt(p);
endtask
endclass
class rt_two_ch_test extends rt_base_test;
function new(virtual rt_interface intf);
env = new(intf);
endfunction
endclass
class rt_two_ch_same_chout_test extends rt_two_ch_test;
function new(virtual rt_interface intf);
env = new(intf);
endfunction
endclass
class rt_multi_ch_test extends rt_base_test;//多通道测试
function new(virtual rt_interface intf);
env = new(intf);
endfunction
task run();
rt_packet p;
super.run();
p = new();
p.set_members(0,3,'{8'h33,8'h77});
env.gen.put_pkt(p);
p = new();//每次put_pkt都需要new一下
p.set_members(0,5,'{8'h55,8'h66});
env.gen.put_pkt(p);
p = new();
p.set_members(3,6,'{8'h77,8'h88,8'h22});
env.gen.put_pkt(p);
p = new();
p.set_members(4,7,'{8'haa,8'hcc,8'h33});
env.gen.put_pkt(p);
endtask
endclass
class rt_full_ch_test extends rt_multi_ch_test;
function new(virtual rt_interface intf);
env = new(intf);
endfunction
endclass
//********************************** **********************************//
//********************************** tb **********************************//
module tb;
bit clk,rstn;
logic [15:0] din, frame_n, valid_n;
logic [15:0] dout, valido_n, busy_n, frameo_n;
// 产生时钟，周期为10ns
initial
forever #5ns clk <= !clk;
// 产生复位信号
initial begin
#2ns rstn <= 1;
#10ns rstn <= 0;
#10ns rstn <= 1;
end
//例化router为DUT
router dut(
.reset_n(rstn),
.clock(clk),
.frame_n(intf.frame_n),
.valid_n(intf.valid_n),
.din(intf.din),
.dout(intf.dout),
.busy_n(intf.busy_n),
.valido_n(intf.valido_n),
.frameo_n(intf.frameo_n)
);
rt_interface intf();//例化接口
assign intf.reset_n = rstn;
assign intf.clock = clk;
rt_single_ch_test single_ch_test;
rt_multi_ch_test multi_ch_test;
initial begin : inst_init_proc
single_ch_test = new(intf);
//multi_ch_test = new(intf);
single_ch_test.run();
//multi_ch_test.run();
end
endmodule
1.3 仿真结果
1.3.1 单通道测试(0→3，0→5)
单通道测试：
single_ch_test = new(intf);
//multi_ch_test = new(intf);
single_ch_test.run();
//multi_ch_test.run();
仿真结果：
1.3.2 多通道测试(0→3，0→5，3→6，4→7)
多通道测试：
//single_ch_test = new(intf);
multi_ch_test = new(intf);
//single_ch_test.run();
multi_ch_test.run();
仿真结果：
2. 增加数据传输完成信号、checker的判断、test name
2.1 改进
(1)增加数据传输完成信号，数据传输完成后调用checker里的report进行报告
task report();
wait(gen_trans_done == 1);
#(test_drain_time_us * 1us);
env.report(name); //调用env里的chk.report()进行report
$finish();//terminates the current test
endtask
(2)增加checker比较的判断，需判断exp_out_pkts与mon.out_pkts必须有数据
function void report();
$display("TOTAL COMPARING %0d times",compare_count);
if(!error_count && check_data_buffer())//判断无误且二者有数据
$display("TEST PASSED!");
else begin
$display("TEST FAILED!");
$display("TOTAL ERROR %0d times", error_count);
end
endfunction
function bit check_data_buffer();
check_data_buffer = 1;
foreach(exp_out_pkts[id])begin
if(exp_out_pkts[id].size != 0)begin //exp_out_pkts必须有数据
check_data_buffer = 0;
$display("exp_out_pkts[%0d] buffer size is not 0(still with %0d data)",id,exp_out_pkts[id].size);
end
if(mon.out_pkts[id].size != 0)begin //mon.out_pkts必须有数据
check_data_buffer = 0;
$display("mon.out_pkts[%0d] buffer size is not 0(still with %0d data)",id,mon.out_pkts[id].size);
end
end
endfunction
(3)增加test的name，并由checker里的report函数打印
2.2 改进后的tb.sv
class rt_packet;
bit [3:0] src;
bit [3:0] dst;
bit [7:0] data [];
function new();
endfunction
function void set_members(bit [3:0]src, bit [3:0]dst, bit[7:0]data []);
this.src = src;
this.dst = dst;
this.data = data;
endfunction
function string sprint();//打印packet信息的函数
sprint = {sprint , $sformatf("src = %0d\n",src)};
sprint = {sprint , $sformatf("dst = %0d\n",dst)};
sprint = {sprint , $sformatf("data_length = %0d\n",data.size())};
foreach(data[i])
sprint = {sprint , $sformatf("data[%0d] = 'h%0x\n", i, data[i])};
endfunction
function bit compare(rt_packet p);//输入exp_pkt
if(dst == p.dst && data == p.data)
compare = 1;
else
compare = 0;
endfunction
endclass
interface rt_interface();
logic clock;
logic reset_n;
logic [15:0] din;
logic [15:0] frame_n;
logic [15:0] valid_n;
logic [15:0] dout;
logic [15:0] valido_n;
logic [15:0] busy_n;
logic [15:0] frameo_n;
endinterface
//********************************** stimulator **********************************//
class rt_stimulator;
virtual rt_interface intf;//class里的接口不能用端口的方式描述，需要添加virtual关键字，在类里面用接口的指针
//for debug purpose from waveform //定义检测状态的变量
typedef enum {DRV_RESET,DRV_IDLE,DRV_ADDR,DRV_PAD,DRV_DATA} drv_state_t;
drv_state_t dbg_state;
byte unsigned dbg_din_chnl0_data;
int src_chnl_status[int]; //关联数组，后面int：src_chnl的number；前面int：dest_chnl的Number ？？
//generator传送p给stimulator
rt_packet pkts[$];//定义stimulator中的的队列pkts
function void put_pkt(input rt_packet p);
pkts.push_back(p); //将generator中传过来的p放入stimulator的pkts中(在pkts队列尾插入p)
endfunction
task run();
fork
drive_reset(); //reset动作
get_packet_and_drive(); //drive_chnl动作
join_none
endtask
task drive_reset();//reset
forever begin
@(negedge intf.reset_n);
dbg_state <= DRV_RESET;
intf.din <= 0;
intf.frame_n <= '1;//等效16'hFFFF
intf.valid_n <= '1;
end
endtask
// 发送数据
task get_packet_and_drive();//drive_chnl
//rt_packet_t p;
@(negedge intf.reset_n);
repeat(10) @(posedge intf.clock);//延迟10个时钟周期
forever begin
automatic rt_packet p;//声明一个动态的
wait(pkts.size()>0);
p = pkts.pop_front(); //将p从队列pkts里面取出
fork//后台触发线程，触发线程在后台运行，继续执行剩下内容
begin
wait_src_chnl_avail(p);//判断src chnl是否被占用，是否需要等待
drive_chnl(p);//从P中拿到发送端口，目标端口，发送数据
set_src_chnl_avail(p);
end
join_none
end
endtask
task wait_src_chnl_avail(rt_packet p);//判断src chnl是否被占用，是否需要等待
if(!src_chnl_status.exists(p.src))//src_chnl_status关联数组里面不含p.src，(表示未占用任何dest_chnl,一开始不满足）
src_chnl_status[p.src] = p.dst;//表示当前正在使用src_chnl,对应dest_chnl就是p.dst（p.src端口在向p.dst端口发送数据）
else if(src_chnl_status[p.src] >= 0)//如果在给0,1,2...dest_chnl发送数据（被占用），需要等待,，否则不需要等待
wait(src_chnl_status[p.src] == -1);//直到src_chnl_status[p.src] == -1(自定义的dest_chnl端口数之外任意的数，表示未占用任何dest_chnl)
endtask
function set_src_chnl_avail(rt_packet p);
src_chnl_status[p.src] = -1;//如果chnl发送完后，把src_chnl置回来(自定义的dest_chnl端口数之外任意的数，表示未占用任何dest_chnl)
endfunction
task drive_chnl(rt_packet p);
$display("@%0t:[DRV] src_chnl[%0d] & dest_chnl[%0d] data trans started with packet: \n%s",$time,p.src,p.dst,p.sprint());
// drive address phase 输入地址位阶段
for(int i=0;i<4;i++)begin //4 clock
@(posedge intf.clock);
dbg_state <=DRV_ADDR;
intf.din[p.src] <= p.dst[i];
intf.valid_n[p.src] <= $urandom_range(0,1); //valid_n在din的地址输入时间段可为任意值x
intf.frame_n[p.src] <= 1'b0; //frame_n需要为低
end
// drive pad phase //隔离阶段
for (int i=0;i<5;i++)begin //5 clock
@(posedge intf.clock);
dbg_state <=DRV_PAD;
intf.din[p.src] <= 1'b1;
intf.valid_n[p.src] <= 1'b1; //valid_n需为高电平
intf.frame_n[p.src] <= 1'b0; //frame_n需为低电平
end
// drive data phase 传输数据阶段
foreach(p.data[id])begin
for(int i=0;i<8;i++)begin
@(posedge intf.clock);
dbg_state <=DRV_DATA;
dbg_din_chnl0_data <= p.data[id];
intf.din[p.src] <= p.data[id][i];
intf.valid_n[p.src] <=1'b0;
intf.frame_n[p.src] <= (id == p.data.size()-1 && i == 7) ? 1'b1 : 1'b0;//packet最后一位输出数据时frameo_n为高
end
end
// drive idle phase 闲置（没有数据传输）阶段
@(posedge intf.clock);
dbg_state <=DRV_IDLE;
dbg_din_chnl0_data <= 0;
intf.din[p.src] <= 1'b0;
intf.valid_n[p.src] <= 1'b1;
intf.frame_n[p.src] <= 1'b1;
$display("@%0t: [DRV]src_chnl[%0d],dest_chnl[%0d] data trans finished",$time,p.src,p.dst);
endtask
endclass
//********************************** generator **********************************//
class rt_generator; //generator产生数据交给stimulator
rt_packet pkts[$]; //定义队列
function void put_pkt(input rt_packet p);
pkts.push_back(p); //将p放入队列pkts里面（在pkts队列尾插入p）
endfunction
task get_pkt(output rt_packet p);
wait(pkts.size() >0 ) //队列不为空
p = pkts.pop_front(); //将p从队列pkts里面取出，提取队列首元素
endtask
//generate a random packet
function void gen_pkt(int src = -1, int dst = -1);
endfunction
task run();
//TODO
endtask
endclass
//********************************** monitor **********************************//
class rt_monitor;
virtual rt_interface intf;
rt_packet in_pkts[16][$];
rt_packet out_pkts[16][$];
task run();
fork
mon_chnls();
join_none
endtask
task mon_chnls;
foreach(in_pkts[i]) begin
automatic int chid = i;
fork
mon_chnl_in(chid);//每个输入端口均调用mon_chnl_in任务，监测数据输入
mon_chnl_out(chid);//每个输出端口均调用mon_chnl_out任务，监测数据输入
join_none
end
endtask
task mon_chnl_in (bit[3:0]id);//监测数据输入的任务
rt_packet pkt; //定义结构体变量
forever begin
//clear content for the same struct variable。清除pkt
pkt = new();
pkt.src = id; //第id个输入端口
//monitor specific channel-in data and put it into the queue
// monitor address phase
@(negedge intf.frame_n[id]);//监测frame_n下降沿(frame_n由时钟驱动)
for(int i=0; i<4; i++)begin
@(negedge intf.clock); //frame_n下降沿后监测4个clk negedge
pkt.dst[i]= intf.din[id];
end
$display ("@%0t: [MON] src_chn1[%0d] & dest_chn1[%0d] data trans started",$time,pkt.src,pkt.dst);
//pass pad phase 不考虑pad阶段是否满足协议要求
repeat(5) @(negedge intf.clock);
do begin
pkt.data = new [pkt.data.size + 1](pkt.data);//创建动态数组并复制pkt.data
for ( int i=0; i<8; i++) begin
@(negedge intf.clock); //在8个clk negedge监测8bit数据
pkt.data[pkt.data.size-1][i] = intf.din[id];
end
end while(!intf.frame_n[id]);
in_pkts[id].push_back(pkt); //将monitor拿到的数据放入in_pkts
$display("@%0t:[MON] CH_IN src_chnl[%0d] &dest_chnl[%0d ] finished with packet: \n%s",$time,pkt.src,pkt.dst,pkt.sprint());
end
endtask
task mon_chnl_out(bit[ 3:0]id);//监测数据输出的任务
rt_packet pkt;
forever begin
//clear content for the same struct variable
pkt = new();
pkt.src = 0;
pkt.dst = id;
@(negedge intf.frameo_n[id]);
$display( "@%0t: [MON] CH_OUT dest_chn1[%0d] data trans started",$time,pkt.dst);
do begin
pkt.data = new [ pkt.data.size + 1](pkt.data);
for(int i=0;i<8; i++) begin
@(negedge intf.clock iff !intf.valido_n[id]);//clock与valido_n信号同时为低
pkt.data[pkt.data.size-1][i]= intf.dout [id];
end
end while(!intf.frameo_n[id]);
out_pkts[id].push_back(pkt);
$display("@%0t: [MON] CH_OUT dest_chn1[%0d] data finished woth packet : \n %s",$time,pkt.dst,pkt.sprint());
//monitor specific channel-out data and put it into the queue
end
endtask
endclass
//********************************** checker **********************************//
class rt_checker;
int unsigned compare_count;
int unsigned error_count;
function new();//赋初值，可有可无，整形变量默认初始值为0
compare_count = 0;
error_count = 0;
endfunction
rt_packet exp_out_pkts[16][$];
rt_monitor mon;
task run();
foreach(exp_out_pkts[i])begin
automatic int chid = i;
fork
do_routing(chid);
do_compare(chid);
join_none
end
endtask
task do_routing(bit[3:0] id);//将monitor中采样到的输入数据放入期望的输出端队列中
rt_packet pkt;
forever begin
wait(mon.in_pkts[id].size > 0);
pkt = mon.in_pkts[id].pop_front();//从monitor中拿到in_pkts队列数据放入pkt
exp_out_pkts[pkt.dst].push_back(pkt);//将pkt数据放入对应期望的dest_chnl
end
endtask
task do_compare(bit[3:0] id);//比较采集的实际输出与期望输出
rt_packet exp_pkt, act_pkt;
forever begin
wait(mon.out_pkts[id].size > 0 && exp_out_pkts[id].size > 0);//实际采样数据与期望数据都有值
act_pkt = mon.out_pkts[id].pop_front();//实际数据为monitor采样的输出数据
exp_pkt = exp_out_pkts[id].pop_front();//期望数据为monitor采样到的输入数据
if(act_pkt.compare(exp_pkt))begin//如果exp_pkt与act_pkt比较成功，返回1
$display("[CHK] data compare success with packet : \n%s",act_pkt.sprint());
end
else begin
$display("[CHK] data compare failure with actual packet : \n%s \nexpected packet : \n%s", act_pkt.sprint(), exp_pkt.sprint());
error_count++;
end
compare_count++;
end
endtask
function void report(string name);
$display("TOTAL COMPARING %0d times",compare_count);
if(!error_count && check_data_buffer())//判断无误且二者有数据
$display("TEST [%s] PASSED!",name);
else begin
$display("TEST [%s]FAILED!",name);
$display("TOTAL ERROR %0d times", error_count);
end
endfunction
function bit check_data_buffer();
check_data_buffer = 1;
foreach(exp_out_pkts[id])begin
if(exp_out_pkts[id].size != 0)begin //exp_out_pkts必须有数据
check_data_buffer = 0;
$display("exp_out_pkts[%0d] buffer size is not 0(still with %0d data)",id,exp_out_pkts[id].size);
end
if(mon.out_pkts[id].size != 0)begin //mon.out_pkts必须有数据
check_data_buffer = 0;
$display("mon.out_pkts[%0d] buffer size is not 0(still with %0d data)",id,mon.out_pkts[id].size);
end
end
endfunction
endclass
//********************************** Optional tests **********************************//
class rt_env; //rt_env包含各个组件
rt_stimulator stim;
rt_monitor mon;
rt_generator gen;
rt_checker chk;
function new(virtual rt_interface intf);
//build stage,例化
stim = new();
gen = new();
mon = new();
chk = new();
//connect stage，连接
stim.intf = intf;
mon.intf = intf;
chk.mon = mon;//check拿monitor句柄，即拿monitor中in_pkts与out_pkts队列
endfunction
task run();
rt_packet p;
//run stage，run
fork
stim.run();//class里面的函数不会自动调用，需要手动调用
gen.run();
mon.run();
chk.run();
begin:genarator_to_stimulator_proc//取出genarator中的数据给stimulator
forever begin //此处不需要延迟0，执行task run的时候默认function new已执行
gen.get_pkt(p); //get句柄
stim.put_pkt(p);//put句柄
end
end
join_none
endtask
function void report(string name);
chk.report(name);
endfunction
endclass
class rt_base_test; //rt_base_test包含rt_env，rt_env包含各个组件
rt_env env;
bit gen_trans_done = 0;//表示数据传输未开始
int unsigned test_drain_time_us = 1;//数据传输完后等待报告的时间
string name;
function new(virtual rt_interface intf,string name = "rt_base_test");
env = new(intf);
this.name = name;
endfunction
task run();
$display("TEST %s started",name);
fork
env.run();
report(); //调用report
join_none
endtask
task report();
wait(gen_trans_done == 1);
#(test_drain_time_us * 1us);
env.report(name); //调用env里的chk.report()进行report
$finish();//terminates the current test
endtask
function void set_trans_done(bit done = 1);//将set_trans_done信号置为1，表示数据传输已完成
gen_trans_done = done;
endfunction
endclass
class rt_single_ch_test extends rt_base_test;//单个通道测试
function new(virtual rt_interface intf,string name = "rt_single_ch_test");
super.new(intf,name);
endfunction
task run();
rt_packet p;
super.run();//调用父类的run，即执行env.run()，进行组件的例化等操作
p = new(); //obj1(每次put_pkt都需要new一下)
p.set_members(0,3,'{8'h33,8'h77});//注意层次变化，在env层次下面
env.gen.put_pkt(p);
p = new(); //obj2
p.set_members(0,5,'{8'h55,8'h66});
env.gen.put_pkt(p);
set_trans_done();
endtask
endclass
class rt_two_ch_test extends rt_base_test;
function new(virtual rt_interface intf,string name = "rt_two_ch_test");
super.new(intf,name);
endfunction
endclass
class rt_two_ch_same_chout_test extends rt_two_ch_test;
function new(virtual rt_interface intf,string name = "rt_two_ch_same_chout_test");
super.new(intf,name);
endfunction
endclass
class rt_multi_ch_test extends rt_base_test;//多通道测试
function new(virtual rt_interface intf,string name = "rt_multi_ch_test");
super.new(intf,name);
endfunction
task run();
rt_packet p;
super.run();
p = new();
p.set_members(0,3,'{8'h33,8'h77});
env.gen.put_pkt(p);
p = new();//每次put_pkt都需要new一下
p.set_members(0,5,'{8'h55,8'h66});
env.gen.put_pkt(p);
p = new();
p.set_members(3,6,'{8'h77,8'h88,8'h22});
env.gen.put_pkt(p);
p = new();
p.set_members(4,7,'{8'haa,8'hcc,8'h33});
env.gen.put_pkt(p);
set_trans_done();
endtask
endclass
class rt_full_ch_test extends rt_multi_ch_test;
function new(virtual rt_interface intf,string name = "rt_full_ch_test");
super.new(intf,name);
endfunction
endclass
//********************************** Optional tests **********************************//
//********************************** tb **********************************//
module tb;
bit clk,rstn;
logic [15:0] din, frame_n, valid_n;
logic [15:0] dout, valido_n, busy_n, frameo_n;
// 产生时钟，周期为10ns
initial
forever #5ns clk <= !clk;
// 产生复位信号
initial begin
#2ns rstn <= 1;
#10ns rstn <= 0;
#10ns rstn <= 1;
end
//例化router为DUT
router dut(
.reset_n(rstn),
.clock(clk),
.frame_n(intf.frame_n),
.valid_n(intf.valid_n),
.din(intf.din),
.dout(intf.dout),
.busy_n(intf.busy_n),
.valido_n(intf.valido_n),
.frameo_n(intf.frameo_n)
);
rt_interface intf();//例化接口
assign intf.reset_n = rstn;
assign intf.clock = clk;
rt_single_ch_test single_ch_test;
rt_multi_ch_test multi_ch_test;
initial begin : inst_init_proc
single_ch_test = new(intf);
//multi_ch_test = new(intf);
single_ch_test.run();
//multi_ch_test.run();
end
endmodule
2.3 仿真结果
同上
3. package封装与makefile的使用
3.1 利用package将文件打包，并将package里的内容放入一个单独的文件里面
rt_test_pkg.sv
package rt_test_pkg;
class rt_packet;
bit [3:0] src;
bit [3:0] dst;
bit [7:0] data [];
function new();
endfunction
function void set_members(bit [3:0]src, bit [3:0]dst, bit[7:0]data []);
this.src = src;
this.dst = dst;
this.data = data;
endfunction
function string sprint();//打印packet信息的函数
sprint = {sprint , $sformatf("src = %0d\n",src)};
sprint = {sprint , $sformatf("dst = %0d\n",dst)};
sprint = {sprint , $sformatf("data_length = %0d\n",data.size())};
foreach(data[i])
sprint = {sprint , $sformatf("data[%0d] = 'h%0x\n", i, data[i])};
endfunction
function bit compare(rt_packet p);//输入exp_pkt
if(dst == p.dst && data == p.data)
compare = 1;
else
compare = 0;
endfunction
endclass
//********************************** stimulator **********************************//
class rt_stimulator;
virtual rt_interface intf;//class里的接口不能用端口的方式描述，需要添加virtual关键字，在类里面用接口的指针
//for debug purpose from waveform //定义检测状态的变量
typedef enum {DRV_RESET,DRV_IDLE,DRV_ADDR,DRV_PAD,DRV_DATA} drv_state_t;
drv_state_t dbg_state;
byte unsigned dbg_din_chnl0_data;
int src_chnl_status[int]; //关联数组，后面int：src_chnl的number；前面int：dest_chnl的Number ？？
//generator传送p给stimulator
rt_packet pkts[$];//定义stimulator中的的队列pkts
function void put_pkt(input rt_packet p);
pkts.push_back(p); //将generator中传过来的p放入stimulator的pkts中(在pkts队列尾插入p)
endfunction
task run();
fork
drive_reset(); //reset动作
get_packet_and_drive(); //drive_chnl动作
join_none
endtask
task drive_reset();//reset
forever begin
@(negedge intf.reset_n);
dbg_state <= DRV_RESET;
intf.din <= 0;
intf.frame_n <= '1;//等效16'hFFFF
intf.valid_n <= '1;
end
endtask
// 发送数据
task get_packet_and_drive();//drive_chnl
//rt_packet_t p;
@(negedge intf.reset_n);
repeat(10) @(posedge intf.clock);//延迟10个时钟周期
forever begin
automatic rt_packet p;//声明一个动态的
wait(pkts.size()>0);
p = pkts.pop_front(); //将p从队列pkts里面取出
fork//后台触发线程，触发线程在后台运行，继续执行剩下内容
begin
wait_src_chnl_avail(p);//判断src chnl是否被占用，是否需要等待
drive_chnl(p);//从P中拿到发送端口，目标端口，发送数据
set_src_chnl_avail(p);
end
join_none
end
endtask
task wait_src_chnl_avail(rt_packet p);//判断src chnl是否被占用，是否需要等待
if(!src_chnl_status.exists(p.src))//src_chnl_status关联数组里面不含p.src，(表示未占用任何dest_chnl,一开始不满足）
src_chnl_status[p.src] = p.dst;//表示当前正在使用src_chnl,对应dest_chnl就是p.dst（p.src端口在向p.dst端口发送数据）
else if(src_chnl_status[p.src] >= 0)//如果在给0,1,2...dest_chnl发送数据（被占用），需要等待,，否则不需要等待
wait(src_chnl_status[p.src] == -1);//直到src_chnl_status[p.src] == -1(自定义的dest_chnl端口数之外任意的数，表示未占用任何dest_chnl)
endtask
function set_src_chnl_avail(rt_packet p);
src_chnl_status[p.src] = -1;//如果chnl发送完后，把src_chnl置回来(自定义的dest_chnl端口数之外任意的数，表示未占用任何dest_chnl)
endfunction
task drive_chnl(rt_packet p);
$display("@%0t:[DRV] src_chnl[%0d] & dest_chnl[%0d] data trans started with packet: \n%s",$time,p.src,p.dst,p.sprint());
// drive address phase 输入地址位阶段
for(int i=0;i<4;i++)begin //4 clock
@(posedge intf.clock);
dbg_state <=DRV_ADDR;
intf.din[p.src] <= p.dst[i];
intf.valid_n[p.src] <= $urandom_range(0,1); //valid_n在din的地址输入时间段可为任意值x
intf.frame_n[p.src] <= 1'b0; //frame_n需要为低
end
// drive pad phase //隔离阶段
for (int i=0;i<5;i++)begin //5 clock
@(posedge intf.clock);
dbg_state <=DRV_PAD;
intf.din[p.src] <= 1'b1;
intf.valid_n[p.src] <= 1'b1; //valid_n需为高电平
intf.frame_n[p.src] <= 1'b0; //frame_n需为低电平
end
// drive data phase 传输数据阶段
foreach(p.data[id])begin
for(int i=0;i<8;i++)begin
@(posedge intf.clock);
dbg_state <=DRV_DATA;
dbg_din_chnl0_data <= p.data[id];
intf.din[p.src] <= p.data[id][i];
intf.valid_n[p.src] <=1'b0;
intf.frame_n[p.src] <= (id == p.data.size()-1 && i == 7) ? 1'b1 : 1'b0;//packet最后一位输出数据时frameo_n为高
end
end
// drive idle phase 闲置（没有数据传输）阶段
@(posedge intf.clock);
dbg_state <=DRV_IDLE;
dbg_din_chnl0_data <= 0;
intf.din[p.src] <= 1'b0;
intf.valid_n[p.src] <= 1'b1;
intf.frame_n[p.src] <= 1'b1;
$display("@%0t: [DRV]src_chnl[%0d],dest_chnl[%0d] data trans finished",$time,p.src,p.dst);
endtask
endclass
//********************************** generator **********************************//
class rt_generator; //generator产生数据交给stimulator
rt_packet pkts[$]; //定义队列
function void put_pkt(input rt_packet p);
pkts.push_back(p); //将p放入队列pkts里面（在pkts队列尾插入p）
endfunction
task get_pkt(output rt_packet p);
wait(pkts.size() >0 ) //队列不为空
p = pkts.pop_front(); //将p从队列pkts里面取出，提取队列首元素
endtask
//generate a random packet
function void gen_pkt(int src = -1, int dst = -1);
endfunction
task run();
//TODO
endtask
endclass
//********************************** monitor **********************************//
class rt_monitor;
virtual rt_interface intf;
rt_packet in_pkts[16][$];
rt_packet out_pkts[16][$];
task run();
fork
mon_chnls();
join_none
endtask
task mon_chnls;
foreach(in_pkts[i]) begin
automatic int chid = i;
fork
mon_chnl_in(chid);//每个输入端口均调用mon_chnl_in任务，监测数据输入
mon_chnl_out(chid);//每个输出端口均调用mon_chnl_out任务，监测数据输入
join_none
end
endtask
task mon_chnl_in (bit[3:0]id);//监测数据输入的任务
rt_packet pkt; //定义结构体变量
forever begin
//clear content for the same struct variable。清除pkt
pkt = new();
pkt.src = id; //第id个输入端口
//monitor specific channel-in data and put it into the queue
// monitor address phase
@(negedge intf.frame_n[id]);//监测frame_n下降沿(frame_n由时钟驱动)
for(int i=0; i<4; i++)begin
@(negedge intf.clock); //frame_n下降沿后监测4个clk negedge
pkt.dst[i]= intf.din[id];
end
$display ("@%0t: [MON] src_chn1[%0d] & dest_chn1[%0d] data trans started",$time,pkt.src,pkt.dst);
//pass pad phase 不考虑pad阶段是否满足协议要求
repeat(5) @(negedge intf.clock);
do begin
pkt.data = new [pkt.data.size + 1](pkt.data);//创建动态数组并复制pkt.data
for ( int i=0; i<8; i++) begin
@(negedge intf.clock); //在8个clk negedge监测8bit数据
pkt.data[pkt.data.size-1][i] = intf.din[id];
end
end while(!intf.frame_n[id]);
in_pkts[id].push_back(pkt); //将monitor拿到的数据放入in_pkts
$display("@%0t:[MON] CH_IN src_chnl[%0d] &dest_chnl[%0d ] finished with packet: \n%s",$time,pkt.src,pkt.dst,pkt.sprint());
end
endtask
task mon_chnl_out(bit[ 3:0]id);//监测数据输出的任务
rt_packet pkt;
forever begin
//clear content for the same struct variable
pkt = new();
pkt.src = 0;
pkt.dst = id;
@(negedge intf.frameo_n[id]);
$display( "@%0t: [MON] CH_OUT dest_chn1[%0d] data trans started",$time,pkt.dst);
do begin
pkt.data = new [ pkt.data.size + 1](pkt.data);
for(int i=0;i<8; i++) begin
@(negedge intf.clock iff !intf.valido_n[id]);//clock与valido_n信号同时为低
pkt.data[pkt.data.size-1][i]= intf.dout [id];
end
end while(!intf.frameo_n[id]);
out_pkts[id].push_back(pkt);
$display("@%0t: [MON] CH_OUT dest_chn1[%0d] data finished woth packet : \n %s",$time,pkt.dst,pkt.sprint());
//monitor specific channel-out data and put it into the queue
end
endtask
endclass
//********************************** checker **********************************//
class rt_checker;
int unsigned compare_count;
int unsigned error_count;
function new();//赋初值，可有可无，整形变量默认初始值为0
compare_count = 0;
error_count = 0;
endfunction
rt_packet exp_out_pkts[16][$];
rt_monitor mon;
task run();
foreach(exp_out_pkts[i])begin
automatic int chid = i;
fork
do_routing(chid);
do_compare(chid);
join_none
end
endtask
task do_routing(bit[3:0] id);//将monitor中采样到的输入数据放入期望的输出端队列中
rt_packet pkt;
forever begin
wait(mon.in_pkts[id].size > 0);
pkt = mon.in_pkts[id].pop_front();//从monitor中拿到in_pkts队列数据放入pkt
exp_out_pkts[pkt.dst].push_back(pkt);//将pkt数据放入对应期望的dest_chnl
end
endtask
task do_compare(bit[3:0] id);//比较采集的实际输出与期望输出
rt_packet exp_pkt, act_pkt;
forever begin
wait(mon.out_pkts[id].size > 0 && exp_out_pkts[id].size > 0);//实际采样数据与期望数据都有值
act_pkt = mon.out_pkts[id].pop_front();//实际数据为monitor采样的输出数据
exp_pkt = exp_out_pkts[id].pop_front();//期望数据为monitor采样到的输入数据
if(act_pkt.compare(exp_pkt))begin//如果exp_pkt与act_pkt比较成功，返回1
$display("[CHK] data compare success with packet : \n%s",act_pkt.sprint());
end
else begin
$display("[CHK] data compare failure with actual packet : \n%s \nexpected packet : \n%s", act_pkt.sprint(), exp_pkt.sprint());
error_count++;
end
compare_count++;
end
endtask
function void report(string name);
$display("TOTAL COMPARING %0d times",compare_count);
if(!error_count && check_data_buffer())//判断无误且二者有数据
$display("TEST [%s] PASSED!",name);
else begin
$display("TEST [%s]FAILED!",name);
$display("TOTAL ERROR %0d times", error_count);
end
endfunction
function bit check_data_buffer();
check_data_buffer = 1;
foreach(exp_out_pkts[id])begin
if(exp_out_pkts[id].size != 0)begin //exp_out_pkts必须有数据
check_data_buffer = 0;
$display("exp_out_pkts[%0d] buffer size is not 0(still with %0d data)",id,exp_out_pkts[id].size);
end
if(mon.out_pkts[id].size != 0)begin //mon.out_pkts必须有数据
check_data_buffer = 0;
$display("mon.out_pkts[%0d] buffer size is not 0(still with %0d data)",id,mon.out_pkts[id].size);
end
end
endfunction
endclass
//********************************** Optional tests **********************************//
class rt_env; //rt_env包含各个组件
rt_stimulator stim;
rt_monitor mon;
rt_generator gen;
rt_checker chk;
function new(virtual rt_interface intf);
//build stage,例化
stim = new();
gen = new();
mon = new();
chk = new();
//connect stage，连接
stim.intf = intf;
mon.intf = intf;
chk.mon = mon;//check拿monitor句柄，即拿monitor中in_pkts与out_pkts队列
endfunction
task run();
rt_packet p;
//run stage，run
fork
stim.run();//class里面的函数不会自动调用，需要手动调用
gen.run();
mon.run();
chk.run();
begin:genarator_to_stimulator_proc//取出genarator中的数据给stimulator
forever begin //此处不需要延迟0，执行task run的时候默认function new已执行
gen.get_pkt(p); //get句柄
stim.put_pkt(p);//put句柄
end
end
join_none
endtask
function void report(string name);
chk.report(name);
endfunction
endclass
class rt_base_test; //rt_base_test包含rt_env，rt_env包含各个组件
rt_env env;
bit gen_trans_done = 0;//表示数据传输未开始
int unsigned test_drain_time_us = 1;//数据传输完后等待报告的时间
string name;
function new(virtual rt_interface intf,string name = "rt_base_test");
env = new(intf);
this.name = name;
endfunction
task run();
$display("TEST %s started",name);
fork
env.run();
report(); //调用report
join_none
endtask
task report();
wait(gen_trans_done == 1);
#(test_drain_time_us * 1us);
env.report(name); //调用env里的chk.report()进行report
$finish();//terminates the current test
endtask
function void set_trans_done(bit done = 1);//将set_trans_done信号置为1，表示数据传输已完成
gen_trans_done = done;
endfunction
endclass
class rt_single_ch_test extends rt_base_test;//单个通道测试
function new(virtual rt_interface intf,string name = "rt_single_ch_test");
super.new(intf,name);
endfunction
task run();
rt_packet p;
super.run();//调用父类的run，即执行env.run()，进行组件的例化等操作
p = new(); //obj1(每次put_pkt都需要new一下)
p.set_members(0,3,'{8'h33,8'h77});//注意层次变化，在env层次下面
env.gen.put_pkt(p);
p = new(); //obj2
p.set_members(0,5,'{8'h55,8'h66});
env.gen.put_pkt(p);
set_trans_done();
endtask
endclass
class rt_two_ch_test extends rt_base_test;
function new(virtual rt_interface intf,string name = "rt_two_ch_test");
super.new(intf,name);
endfunction
endclass
class rt_two_ch_same_chout_test extends rt_two_ch_test;
function new(virtual rt_interface intf,string name = "rt_two_ch_same_chout_test");
super.new(intf,name);
endfunction
endclass
class rt_multi_ch_test extends rt_base_test;//多通道测试
function new(virtual rt_interface intf,string name = "rt_multi_ch_test");
super.new(intf,name);
endfunction
task run();
rt_packet p;
super.run();
p = new();
p.set_members(0,3,'{8'h33,8'h77});
env.gen.put_pkt(p);
p = new();//每次put_pkt都需要new一下
p.set_members(0,5,'{8'h55,8'h66});
env.gen.put_pkt(p);
p = new();
p.set_members(3,6,'{8'h77,8'h88,8'h22});
env.gen.put_pkt(p);
p = new();
p.set_members(4,7,'{8'haa,8'hcc,8'h33});
env.gen.put_pkt(p);
set_trans_done();
endtask
endclass
class rt_full_ch_test extends rt_multi_ch_test;
function new(virtual rt_interface intf,string name = "rt_full_ch_test");
super.new(intf,name);
endfunction
endclass
endpackage
//********************************** Optional tests **********************************//
lab7tb.sv
interface rt_interface();
logic clock;
logic reset_n;
logic [15:0] din;
logic [15:0] frame_n;
logic [15:0] valid_n;
logic [15:0] dout;
logic [15:0] valido_n;
logic [15:0] busy_n;
logic [15:0] frameo_n;
endinterface
//********************************** tb **********************************//
module tb;
import rt_test_pkg:: * ;
bit clk,rstn;
logic [15:0] din, frame_n, valid_n;
logic [15:0] dout, valido_n, busy_n, frameo_n;
// 产生时钟，周期为10ns
initial
forever #5ns clk <= !clk;
// 产生复位信号
initial begin
#2ns rstn <= 1;
#10ns rstn <= 0;
#10ns rstn <= 1;
end
//例化router为DUT
router dut(
.reset_n(rstn),
.clock(clk),
.frame_n(intf.frame_n),
.valid_n(intf.valid_n),
.din(intf.din),
.dout(intf.dout),
.busy_n(intf.busy_n),
.valido_n(intf.valido_n),
.frameo_n(intf.frameo_n)
);
rt_interface intf();//例化接口
assign intf.reset_n = rstn;
assign intf.clock = clk;
rt_single_ch_test single_ch_test;
rt_multi_ch_test multi_ch_test;
initial begin : inst_init_proc
single_ch_test = new(intf);
multi_ch_test = new(intf);
//single_ch_test.run();
multi_ch_test.run();
end
endmodule
VCS命令
vcs -full64 -debug_access+all -sverilog -timescale=1ns/1ps router.v rt_test_pkg.sv lab7tb.sv -top tb
//注意文件顺序，lab7tb.sv中的类是在rt_test_pkg.sv中创建的，rt_test_pkg.sv应在前面
3.2 使用makefile
使用脚本包含命令及其组合，makefile代码如下：
###########################
# User variables
###########################
TB = tb
SEED = 1
TESTNAME ?= rt_single_ch_test
FILES = router.v rt_test_pkg.sv lab7tb.sv #User Defination
###########################
# Environment variables
###########################
COMP = vcs -full64 -sverilog -debug_access+all -timescale=1ns/1ps -l comp.log $(FILES)
RUN = ./$(TB).simv -l run.log -sml +ntb_random_seed=$(SEED) +TESTNAME=$(TESTNAME)
comp:
$(COMP) -top $(TB) -o $(TB).simv
run:
$(RUN)
rung:
$(RUN) -gui
相关命令：
make comp //编译当前路径下的makefile文件，生成命令
make run/make rung //执行run或rung的内容，生成log文件，make rung会调用vcs的可视化窗口
3.3对makefile增加输入参数
将外部输入参数添加到tb文件中：
initial begin : Select_the_test
string name;
single_ch_test = new(intf);
multi_ch_test = new(intf);
//single_ch_test.run();
//multi_ch_test.run();
if($value$plusargs("TESTNAME=%s",name))begin//$value$plusargs作用：运行仿真时输入参数
case(name)
"rt_single_ch_test" : single_ch_test.run();//输入rt_single_ch_test，调用对应run，执行输入rt_single_ch_test
"rt_multi_ch_test" :multi_ch_test.run();
default:$fatal("[ERRTEST],test name %s is invalid,please specity a valid name!0",name);
endcase
end
end
相关命令：
make rung TESTNAME=rt_multi_ch_test & //传入参数rt_multi_ch_test，进行多通道测试
make rung TESTNAME=rt_single_ch_test & //传入参数rt_single_ch_test，进行多通道测试
3.4 仿真结果
同上
