前言:验证结构与实验3是相同的,但需要验证的对象是完整的mcdf。对比之前新添加了reg寄存器模块(选择数据),formatter模块(数据打包)。
种一棵树最好的时间是十年前,其次是现在。不是吗?
在实验4,理解整个验证结构组成,理解各个package。类比实验3来学习实验4。
关于实验代码、验证相关的资料,你找的到的找不到的都可以从公众号"袁小丑"免费获取!
`include "param_def.v"//定义宏,比如定义SLV0_RW_ADDR的具体值,修改值只需要修改宏。
package reg_pkg;
class reg_trans;
rand bit[7:0] addr;//哪个寄存器
rand bit[1:0] cmd;//读写
rand bit[31:0] data;//数据内容
bit rsp;//判断读写是否正常
constraint cstr {
soft cmd inside {`WRITE, `READ, `IDLE};//读还是写引用定义
soft addr inside {`SLV0_RW_ADDR, `SLV1_RW_ADDR, `SLV2_R_ADDR, `SLV0_R_ADDR, `SLV1_R_ADDR, `SLV2_R_ADDR};//3个读地址,3个写地址
addr[7:4]==0 && cmd==`WRITE -> soft data[31:6]==0;
soft addr[7:5]==0;
addr[4]==1 -> soft cmd == `READ;//表示只读寄存器
};
在 mcdf说明文档中寄存器的地址有00、04、08、10、14和18。这6中,用二进制表示为0000_0000、0000_0100、0000_1000、0001_0000、0001_0100、0001_1000。
读写寄存器
bit(0):通道使能信号。1为打开,0位关闭。复位值为1。 bit(2:1):优先级。0为最高,3为最低。复位值为3。
bit(5:3):数据包长度,解码对应表为,
0对应长度4,1对应长度8,2对应长度16,3对应长度32,其它数值(4-7)均暂时对应长度32。复位值为0。
bit(31:6):保留位,无法写入。复位值为0。
只读寄存器
bit(7:0):上行数据从端FIFO的可写余量,同FIFO的数据余量保持同步变化。复位值为FIFO的深度数。
bit(31:8):保留位,复位值为0。
function reg_trans clone();
reg_trans c = new();
c.addr = this.addr;
c.cmd = this.cmd;
c.data = this.data;
c.rsp = this.rsp;
return c;
endfunction
function string sprint();
string s;
s = {s, $sformatf("=======================================\n")};
s = {s, $sformatf("reg_trans object content is as below: \n")};
s = {s, $sformatf("addr = %2x: \n", this.addr)};
s = {s, $sformatf("cmd = %2b: \n", this.cmd)};
s = {s, $sformatf("data = %8x: \n", this.data)};
s = {s, $sformatf("rsp = %0d: \n", this.rsp)};
s = {s, $sformatf("=======================================\n")};
return s;
endfunction
endclass
class reg_driver;
local string name;
local virtual reg_intf intf;
mailbox #(reg_trans) req_mb;
mailbox #(reg_trans) rsp_mb;
function new(string name = "reg_driver");
this.name = name;
endfunction
function void set_interface(virtual reg_intf intf);
if(intf == null)
$error("interface handle is NULL, please check if target interface has been intantiated");
else
this.intf = intf;
endfunction
task run();
fork
this.do_drive();
this.do_reset();
join
endtask
task do_reset(); //复位
forever begin
@(negedge intf.rstn);
intf.cmd_addr <= 0;
intf.cmd <= `IDLE;
intf.cmd_data_m2s <= 0;
end
endtask
task do_drive();
reg_trans req, rsp;
@(posedge intf.rstn);
forever begin
this.req_mb.get(req);
this.reg_write(req);
rsp = req.clone();
rsp.rsp = 1;
this.rsp_mb.put(rsp);
end
endtask
task reg_write(reg_trans t);//给寄存器
@(posedge intf.clk iff intf.rstn);
case(t.cmd)
`WRITE: begin //如果是写操作
intf.drv_ck.cmd_addr <= t.addr; //地址
intf.drv_ck.cmd <= t.cmd;
intf.drv_ck.cmd_data_m2s <= t.data; //数据
end
`READ: begin
intf.drv_ck.cmd_addr <= t.addr; //总线
intf.drv_ck.cmd <= t.cmd;
repeat(2) @(negedge intf.clk);//等两个时钟的下降沿,第一个下降沿还在
t.data = intf.cmd_data_s2m; //采样了intf的数据
end
`IDLE: begin
this.reg_idle(); //等一拍
end
default: $error("command %b is illegal", t.cmd);
endcase
$display("%0t reg driver [%s] sent addr %2x, cmd %2b, data %8x", $time, name, t.addr, t.cmd, t.data);
endtask
当case为 READ时,等待了两个时钟的下降沿。
第一个下降沿还在当前周期,第二个下降沿就在下一个周期了。此时数据已经驱动到接口cmd_data_s2m处了,这时去采样接口处的数据就一定是要读的数据。
task reg_idle();
@(posedge intf.clk);
intf.drv_ck.cmd_addr <= 0;
intf.drv_ck.cmd <= `IDLE;
intf.drv_ck.cmd_data_m2s <= 0;
endtask
endclass
class reg_generator;
rand bit[7:0] addr = -1;
rand bit[1:0] cmd = -1;
rand bit[31:0] data = -1;
mailbox #(reg_trans) req_mb;
mailbox #(reg_trans) rsp_mb;
reg_trans reg_req[$];
constraint cstr{
soft addr == -1;
soft cmd == -1;
soft data == -1;
}
function new();
this.req_mb = new();
this.rsp_mb = new();
endfunction
task start();
send_trans();
endtask
// generate transaction and put into local mailbox
task send_trans();
reg_trans req, rsp;//做例化
req = new();
assert(req.randomize with {local::addr >= 0 -> addr == local::addr;
local::cmd >= 0 -> cmd == local::cmd;
local::data >= 0 -> data == local::data;
})
else $fatal("[RNDFAIL] register packet randomization failure!");
$display(req.sprint());
this.req_mb.put(req);//放入数据
this.rsp_mb.get(rsp);
$display(rsp.sprint());
if(req.cmd == `READ)
this.data = rsp.data;
assert(rsp.rsp)
else $error("[RSPERR] %0t error response received!", $time);
endtask
function string sprint();
string s;
s = {s, $sformatf("=======================================\n")};
s = {s, $sformatf("reg_generator object content is as below: \n")};
s = {s, $sformatf("addr = %2x: \n", this.addr)};
s = {s, $sformatf("cmd = %2b: \n", this.cmd)};
s = {s, $sformatf("data = %8x: \n", this.data)};
s = {s, $sformatf("=======================================\n")};
return s;
endfunction
function void post_randomize();
string s;
s = {"AFTER RANDOMIZATION \n", this.sprint()};
$display(s);
endfunction
endclass
class reg_monitor;
local string name;
local virtual reg_intf intf;
mailbox #(reg_trans) mon_mb;
function new(string name="reg_monitor");
this.name = name;
endfunction
function void set_interface(virtual reg_intf intf);
if(intf == null)
$error("interface handle is NULL, please check if target interface has been intantiated");
else
this.intf = intf;
endfunction
task run();
this.mon_trans();
endtask
task mon_trans();
reg_trans m;
forever begin
@(posedge intf.clk iff (intf.rstn && intf.mon_ck.cmd != `IDLE));//时钟的上升沿,并且数据合理
m = new();//生成一个对象,把数据地址放入
m.addr = intf.mon_ck.cmd_addr;
m.cmd = intf.mon_ck.cmd;
if(intf.mon_ck.cmd == `WRITE) begin//写指令,把总线上的数据放入
m.data = intf.mon_ck.cmd_data_m2s;
end
else if(intf.mon_ck.cmd == `READ) begin//读指令,等下一个周期,再放入数据
@(posedge intf.clk);
m.data = intf.mon_ck.cmd_data_s2m;
end
mon_mb.put(m);//把数据交给checker
$display("%0t %s monitored addr %2x, cmd %2b, data %8x", $time, this.name, m.addr, m.cmd, m.data);
end
endtask
endclass
class reg_agent;//包含了monitor,driver,让driver,monitor工作起来
local string name;
reg_driver driver;
reg_monitor monitor;
local virtual reg_intf vif;
function new(string name = "reg_agent");
this.name = name;
this.driver = new({name, ".driver"});
this.monitor = new({name, ".monitor"});
endfunction
function void set_interface(virtual reg_intf vif);
this.vif = vif;
driver.set_interface(vif);
monitor.set_interface(vif);
endfunction
task run();
fork
driver.run();
monitor.run();
join
endtask
endclass
激励的类型、发送激励、产生激励、检测激励、agent
chnl和reg的driver都是主动的发送数据给dut,而fmt的driver是被动的接受发送出来的数据。所以fmt像一个fifo,储存发送出来的数据。
需要设计fifo的大小宽度,来储存发送出来的数据。
package fmt_pkg;
import rpt_pkg::*;
//传出来的数据可能有不同的带宽、需要的fifo大小也不同,把可能需要的都枚举出来。
typedef enum {SHORT_FIFO, MED_FIFO, LONG_FIFO, ULTRA_FIFO} fmt_fifo_t;
typedef enum {LOW_WIDTH, MED_WIDTH, HIGH_WIDTH, ULTRA_WIDTH} fmt_bandwidth_t;
class fmt_trans;
rand fmt_fifo_t fifo;
rand fmt_bandwidth_t bandwidth;
bit [9:0] length;
bit [31:0] data[];
bit [1:0] ch_id;
bit rsp;
constraint cstr{
soft fifo == MED_FIFO;//fifo
soft bandwidth == MED_WIDTH;//带宽
};
function fmt_trans clone();
fmt_trans c = new();
c.fifo = this.fifo;
c.bandwidth = this.bandwidth;
c.length = this.length;
c.data = this.data;
c.ch_id = this.ch_id;
c.rsp = this.rsp;
return c;
endfunction
function string sprint();
string s;
s = {s, $sformatf("=======================================\n")};
s = {s, $sformatf("fmt_trans object content is as below: \n")};
s = {s, $sformatf("fifo = %s: \n", this.fifo)};
s = {s, $sformatf("bandwidth = %s: \n", this.bandwidth)};
s = {s, $sformatf("length = %s: \n", this.length)};
foreach(data[i]) s = {s, $sformatf("data[%0d] = %8x \n", i, this.data[i])};
s = {s, $sformatf("ch_id = %0d: \n", this.ch_id)};
s = {s, $sformatf("rsp = %0d: \n", this.rsp)};
s = {s, $sformatf("=======================================\n")};
return s;
endfunction
function bit compare(fmt_trans t);//当前的与传进来的数作比较
string s;
compare = 1;
s = "\n=======================================\n";
s = {s, $sformatf("COMPARING fmt_trans object at time %0d \n", $time)};
if(this.length != t.length) begin
compare = 0;
s = {s, $sformatf("sobj length %0d != tobj length %0d \n", this.length, t.length)};
end
if(this.ch_id != t.ch_id) begin
compare = 0;
s = {s, $sformatf("sobj ch_id %0d != tobj ch_id %0d\n", this.ch_id, t.ch_id)};
end
foreach(this.data[i]) begin
if(this.data[i] != t.data[i]) begin
compare = 0;
s = {s, $sformatf("sobj data[%0d] %8x != tobj data[%0d] %8x\n", i, this.data[i], i, t.data[i])};
end
end
if(compare == 1) s = {s, "COMPARED SUCCESS!\n"};
else s = {s, "COMPARED FAILURE!\n"};
s = {s, "=======================================\n"};
rpt_pkg::rpt_msg("[CMPOBJ]", s, rpt_pkg::INFO, rpt_pkg::MEDIUM);
endfunction
endclass
class fmt_driver;
local string name;
local virtual fmt_intf intf;
mailbox #(fmt_trans) req_mb;
mailbox #(fmt_trans) rsp_mb;
local mailbox #(bit[31:0]) fifo;
local int fifo_bound;//长度
local int data_consum_peroid;//消耗周期,侧面反应带宽,带宽越大,消耗周期越短
function new(string name = "fmt_driver");
this.name = name;
this.fifo = new();//fifo初始化
this.fifo_bound = 4096;
this.data_consum_peroid = 1;
endfunction
function void set_interface(virtual fmt_intf intf);
if(intf == null)
$error("interface handle is NULL, please check if target interface has been intantiated");
else
this.intf = intf;
endfunction
task run();
fork
this.do_receive();
this.do_consume();
this.do_config();
this.do_reset();
join
endtask
//配置fifo长或者短,消耗数据快还是慢
task do_config();//配置driver,配置完成后重新例化fifo
fmt_trans req, rsp;
forever begin
this.req_mb.get(req);
case(req.fifo)//配置为不同长度
SHORT_FIFO: this.fifo_bound = 64;
MED_FIFO: this.fifo_bound = 256;
LONG_FIFO: this.fifo_bound = 512;
ULTRA_FIFO: this.fifo_bound = 2048;
endcase
this.fifo = new(this.fifo_bound);//重新例化,并且规定长度
case(req.bandwidth)
LOW_WIDTH: this.data_consum_peroid = 8;
MED_WIDTH: this.data_consum_peroid = 4;
HIGH_WIDTH: this.data_consum_peroid = 2;
ULTRA_WIDTH: this.data_consum_peroid = 1;
endcase
rsp = req.clone();
rsp.rsp = 1;
this.rsp_mb.put(rsp);
end
endtask
task do_reset();
forever begin
@(negedge intf.rstn)
intf.fmt_grant <= 0;
end
endtask
task do_receive();//模拟从formater接受数据
forever begin
@(posedge intf.fmt_req);//fmt的req拉高
forever begin
@(posedge intf.clk);//等待一拍
if((this.fifo_bound-this.fifo.num()) >= intf.fmt_length)//fifo最大容量-已经存放了多少>=即将存放的数据长度
break;
end
intf.drv_ck.fmt_grant <= 1;//可以存放数据,让grant为1
@(posedge intf.fmt_start);
fork
begin
@(posedge intf.clk);
intf.drv_ck.fmt_grant <= 0;//过一拍置0
end
join_none
repeat(intf.fmt_length) begin//把传进来的数据在每一拍做采样,重复采样length次。
@(negedge intf.clk);
this.fifo.put(intf.fmt_data);
end
end
endtask
task do_consume();//不断的消耗数据,每过一拍拿一组数据
bit[31:0] data;
forever begin
void'(this.fifo.try_get(data));
repeat($urandom_range(1, this.data_consum_peroid)) @(posedge intf.clk);
end
endtask
endclass
class fmt_generator;
rand fmt_fifo_t fifo = MED_FIFO;
rand fmt_bandwidth_t bandwidth = MED_WIDTH;
mailbox #(fmt_trans) req_mb;
mailbox #(fmt_trans) rsp_mb;
constraint cstr{
soft fifo == MED_FIFO;
soft bandwidth == MED_WIDTH;
}
function new();
this.req_mb = new();
this.rsp_mb = new();
endfunction
task start();
send_trans();
endtask
// generate transaction and put into local mailbox
task send_trans();
fmt_trans req, rsp;
req = new();
assert(req.randomize with {local::fifo != MED_FIFO -> fifo == local::fifo;
local::bandwidth != MED_WIDTH -> bandwidth == local::bandwidth;
})
else $fatal("[RNDFAIL] formatter packet randomization failure!");
$display(req.sprint());
this.req_mb.put(req);
this.rsp_mb.get(rsp);
$display(rsp.sprint());
assert(rsp.rsp)
else $error("[RSPERR] %0t error response received!", $time);
endtask
function string sprint();
string s;
s = {s, $sformatf("=======================================\n")};
s = {s, $sformatf("fmt_generator object content is as below: \n")};
s = {s, $sformatf("fifo = %s: \n", this.fifo)};
s = {s, $sformatf("bandwidth = %s: \n", this.bandwidth)};
s = {s, $sformatf("=======================================\n")};
return s;
endfunction
function void post_randomize();
string s;
s = {"AFTER RANDOMIZATION \n", this.sprint()};
$display(s);
endfunction
endclass
class fmt_monitor;
local string name;
local virtual fmt_intf intf;
mailbox #(fmt_trans) mon_mb;
function new(string name="fmt_monitor");
this.name = name;
endfunction
function void set_interface(virtual fmt_intf intf);
if(intf == null)
$error("interface handle is NULL, please check if target interface has been intantiated");
else
this.intf = intf;
endfunction
task run();
this.mon_trans();
endtask
task mon_trans();
fmt_trans m;
string s;
forever begin
@(posedge intf.mon_ck.fmt_start);//假定协议是正常的
m = new();
m.length = intf.mon_ck.fmt_length;
m.ch_id = intf.mon_ck.fmt_chid;
m.data = new[m.length];
foreach(m.data[i]) begin
@(posedge intf.clk);
m.data[i] = intf.mon_ck.fmt_data;//每一次数据来的时候,都存放在动态数组
end
mon_mb.put(m);//放好数据后,放入信箱
s = $sformatf("=======================================\n");
s = {s, $sformatf("%0t %s monitored a packet: \n", $time, this.name)};
s = {s, $sformatf("length = %0d: \n", m.length)};
s = {s, $sformatf("chid = %0d: \n", m.ch_id)};
foreach(m.data[i]) s = {s, $sformatf("data[%0d] = %8x \n", i, m.data[i])};
s = {s, $sformatf("=======================================\n")};
$display(s);
end
endtask
endclass
class fmt_agent;
local string name;
fmt_driver driver;
fmt_monitor monitor;
local virtual fmt_intf vif;
function new(string name = "fmt_agent");
this.name = name;
this.driver = new({name, ".driver"});
this.monitor = new({name, ".monitor"});
endfunction
function void set_interface(virtual fmt_intf vif);
this.vif = vif;
driver.set_interface(vif);
monitor.set_interface(vif);
endfunction
task run();
fork
driver.run();
monitor.run();
join
endtask
endclass
endpackage
包含了checker、env和test。
`include "param_def.v"
package mcdf_pkg;
import chnl_pkg::*;
import reg_pkg::*;
import arb_pkg::*;
import fmt_pkg::*;
import rpt_pkg::*;
typedef struct packed {
bit[2:0] len; //长度
bit[1:0] prio;//
bit en;//fifo使能
bit[7:0] avail;//表示fifo可选余量
} mcdf_reg_t;
typedef enum {RW_LEN, RW_PRIO, RW_EN, RD_AVAIL} mcdf_field_t;
模拟mcdf的功能接受寄存器的读写行为,对检测来的数据进行打包。
class mcdf_refmod;//模拟mcdf的功能接受寄存器的读写行为,对数据进行打包
local virtual mcdf_intf intf;
local string name;
mcdf_reg_t regs[3];
mailbox #(reg_trans) reg_mb;
mailbox #(mon_data_t) in_mbs[3];
mailbox #(fmt_trans) out_mbs[3];
function new(string name="mcdf_refmod");
this.name = name;
foreach(this.out_mbs[i]) this.out_mbs[i] = new();
endfunction
task run();
fork
do_reset();
this.do_reg_update();//模拟寄存器
do_packet(0);
do_packet(1);
do_packet(2);
join
endtask
task do_reg_update();//硬件上对寄存器的读写更新到仿真中
reg_trans t;//引用regtrans里的数据
forever begin
this.reg_mb.get(t);
if(t.addr[7:4] == 0 && t.cmd == `WRITE) begin
this.regs[t.addr[3:2]].en = t.data[0];
this.regs[t.addr[3:2]].prio = t.data[2:1];
this.regs[t.addr[3:2]].len = t.data[5:3];
end
else if(t.addr[7:4] == 1 && t.cmd == `READ) begin
this.regs[t.addr[3:2]].avail = t.data[7:0];
end
end
endtask
task do_packet(int id);//把chnl的数据打包
fmt_trans ot;
mon_data_t it;
forever begin
this.in_mbs[id].peek(it);
ot = new();
ot.length = 4 << (this.get_field_value(id, RW_LEN) & 'b11);//拿到打包的长度
ot.data = new[ot.length];//开辟空间
ot.ch_id = id;
foreach(ot.data[m]) begin//拿完数据,把ot放到对应的信箱。
this.in_mbs[id].get(it);
ot.data[m] = it.data;
end
this.out_mbs[id].put(ot);
end
endtask
function int get_field_value(int id, mcdf_field_t f);
case(f)
RW_LEN: return regs[id].len;
RW_PRIO: return regs[id].prio;
RW_EN: return regs[id].en;
RD_AVAIL: return regs[id].avail;
endcase
endfunction
task do_reset();//寄存器复位
forever begin
@(negedge intf.rstn);
foreach(regs[i]) begin
regs[i].len = 'h0;
regs[i].prio = 'h3;
regs[i].en = 'h1;
regs[i].avail = 'h20;
end
end
endtask
function void set_interface(virtual mcdf_intf intf);
if(intf == null)
$error("interface handle is NULL, please check if target interface has been intantiated");
else
this.intf = intf;
endfunction
endclass
## 3.2 mcdf_checker
```java
class mcdf_checker;
local string name;
local int err_count;
local int total_count;
local int chnl_count[3];
local virtual mcdf_intf intf;
local mcdf_refmod refmod;
mailbox #(mon_data_t) chnl_mbs[3];
mailbox #(fmt_trans) fmt_mb;
mailbox #(reg_trans) reg_mb;
mailbox #(fmt_trans) exp_mbs[3];
function new(string name="mcdf_checker");
this.name = name;
foreach(this.chnl_mbs[i]) this.chnl_mbs[i] = new();
this.fmt_mb = new();
this.reg_mb = new();
this.refmod = new();
foreach(this.refmod.in_mbs[i]) begin
this.refmod.in_mbs[i] = this.chnl_mbs[i];
this.exp_mbs[i] = this.refmod.out_mbs[i];
end
this.refmod.reg_mb = this.reg_mb;
this.err_count = 0;
this.total_count = 0;
foreach(this.chnl_count[i]) this.chnl_count[i] = 0;
endfunction
function void set_interface(virtual mcdf_intf intf);
if(intf == null)
$error("interface handle is NULL, please check if target interface has been intantiated");
else
this.intf = intf;
this.refmod.set_interface(intf);
endfunction
task run();
fork
this.do_compare();
this.refmod.run();
join
endtask
task do_compare();
fmt_trans expt, mont;
bit cmp;
forever begin
this.fmt_mb.get(mont);
this.exp_mbs[mont.ch_id].get(expt);
cmp = mont.compare(expt);
this.total_count++;
this.chnl_count[mont.ch_id]++;
if(cmp == 0) begin
this.err_count++;
rpt_pkg::rpt_msg("[CMPFAIL]",
$sformatf("%0t %0dth times comparing but failed! MCDF monitored output packet is different with reference model output", $time, this.total_count),
rpt_pkg::ERROR,
rpt_pkg::TOP,
rpt_pkg::LOG);
end
else begin
rpt_pkg::rpt_msg("[CMPSUCD]",
$sformatf("%0t %0dth times comparing and succeeded! MCDF monitored output packet is the same with reference model output", $time, this.total_count),
rpt_pkg::INFO,
rpt_pkg::HIGH);
end
end
endtask
function void do_report();
string s;
s = "\n---------------------------------------------------------------\n";
s = {s, "CHECKER SUMMARY \n"};
s = {s, $sformatf("total comparison count: %0d \n", this.total_count)};
foreach(this.chnl_count[i]) s = {s, $sformatf(" channel[%0d] comparison count: %0d \n", i, this.chnl_count[i])};
s = {s, $sformatf("total error count: %0d \n", this.err_count)};
foreach(this.chnl_mbs[i]) begin
if(this.chnl_mbs[i].num() != 0)
s = {s, $sformatf("WARNING:: chnl_mbs[%0d] is not empty! size = %0d \n", i, this.chnl_mbs[i].num())};
end
if(this.fmt_mb.num() != 0)
s = {s, $sformatf("WARNING:: fmt_mb is not empty! size = %0d \n", this.fmt_mb.num())};
s = {s, "---------------------------------------------------------------\n"};
rpt_pkg::rpt_msg($sformatf("[%s]",this.name), s, rpt_pkg::INFO, rpt_pkg::TOP);
endfunction
endclass
class mcdf_env;
chnl_agent chnl_agts[3];
reg_agent reg_agt;
fmt_agent fmt_agt;
mcdf_checker chker;
protected string name;
function new(string name = "mcdf_env");//做例化和连接
this.name = name;
this.chker = new();
foreach(chnl_agts[i]) begin
this.chnl_agts[i] = new($sformatf("chnl_agts[%0d]",i));
this.chnl_agts[i].monitor.mon_mb = this.chker.chnl_mbs[i];
end
this.reg_agt = new("reg_agt");
this.reg_agt.monitor.mon_mb = this.chker.reg_mb;
this.fmt_agt = new("fmt_agt");
this.fmt_agt.monitor.mon_mb = this.chker.fmt_mb;
$display("%s instantiated and connected objects", this.name);
endfunction
virtual task run();
$display($sformatf("*****************%s started********************", this.name));
this.do_config();
fork
this.chnl_agts[0].run();
this.chnl_agts[1].run();
this.chnl_agts[2].run();
this.reg_agt.run();
this.fmt_agt.run();
this.chker.run();
join
endtask
virtual function void do_config();
endfunction
virtual function void do_report();
this.chker.do_report();
endfunction
endclass
class mcdf_base_test;
chnl_generator chnl_gens[3];
reg_generator reg_gen;
fmt_generator fmt_gen;
mcdf_env env;
protected string name;
function new(string name = "mcdf_base_test");
this.name = name;
this.env = new("env");
foreach(this.chnl_gens[i]) begin
this.chnl_gens[i] = new();
this.env.chnl_agts[i].driver.req_mb = this.chnl_gens[i].req_mb;
this.env.chnl_agts[i].driver.rsp_mb = this.chnl_gens[i].rsp_mb;
end
this.reg_gen = new();
this.env.reg_agt.driver.req_mb = this.reg_gen.req_mb;
this.env.reg_agt.driver.rsp_mb = this.reg_gen.rsp_mb;
this.fmt_gen = new();
this.env.fmt_agt.driver.req_mb = this.fmt_gen.req_mb;
this.env.fmt_agt.driver.rsp_mb = this.fmt_gen.rsp_mb;
rpt_pkg::logname = {this.name, "_check.log"};
rpt_pkg::clean_log();
$display("%s instantiated and connected objects", this.name);
endfunction
virtual task run();
fork
env.run();
join_none
rpt_pkg::rpt_msg("[TEST]",
$sformatf("=====================%s AT TIME %0t STARTED=====================", this.name, $time),
rpt_pkg::INFO,
rpt_pkg::HIGH);
this.do_reg();
this.do_formatter();//先配置fmt的fifo
this.do_data();
rpt_pkg::rpt_msg("[TEST]",
$sformatf("=====================%s AT TIME %0t FINISHED=====================", this.name, $time),
rpt_pkg::INFO,
rpt_pkg::HIGH);
this.do_report();
$finish();
endtask
// do register configuration
virtual task do_reg();
endtask
// do external formatter down stream slave configuration
virtual task do_formatter();
endtask
// do data transition from 3 channel slaves
virtual task do_data();
endtask
// do simulation summary
virtual function void do_report();
this.env.do_report();
rpt_pkg::do_report();
endfunction
virtual function void set_interface(virtual chnl_intf ch0_vif
,virtual chnl_intf ch1_vif
,virtual chnl_intf ch2_vif
,virtual reg_intf reg_vif
,virtual fmt_intf fmt_vif
,virtual mcdf_intf mcdf_vif
);
this.env.chnl_agts[0].set_interface(ch0_vif);
this.env.chnl_agts[1].set_interface(ch1_vif);
this.env.chnl_agts[2].set_interface(ch2_vif);
this.env.reg_agt.set_interface(reg_vif);
this.env.fmt_agt.set_interface(fmt_vif);
this.env.chker.set_interface(mcdf_vif);
endfunction
virtual function bit diff_value(int val1, int val2, string id = "value_compare");
if(val1 != val2) begin
rpt_pkg::rpt_msg("[CMPERR]",
$sformatf("ERROR! %s val1 %8x != val2 %8x", id, val1, val2),
rpt_pkg::ERROR,
rpt_pkg::TOP);
return 0;
end
else begin
rpt_pkg::rpt_msg("[CMPSUC]",
$sformatf("SUCCESS! %s val1 %8x == val2 %8x", id, val1, val2),
rpt_pkg::INFO,
rpt_pkg::HIGH);
return 1;
end
endfunction
virtual task idle_reg();
void'(reg_gen.randomize() with {cmd == `IDLE; addr == 0; data == 0;});
reg_gen.start();
endtask
virtual task write_reg(bit[7:0] addr, bit[31:0] data);
void'(reg_gen.randomize() with {cmd == `WRITE; addr == local::addr; data == local::data;});
reg_gen.start();
endtask
virtual task read_reg(bit[7:0] addr, output bit[31:0] data);
void'(reg_gen.randomize() with {cmd == `READ; addr == local::addr;});
reg_gen.start();
data = reg_gen.data;
endtask
endclass
class mcdf_data_consistence_basic_test extends mcdf_base_test;
function new(string name = "mcdf_data_consistence_basic_test");
super.new(name);
endfunction
task do_reg();
bit[31:0] wr_val, rd_val;
//寄存器规定了第三位为1、2、3时对应8、16、32。
// slv0 with len=8, prio=0, en=1
wr_val = (1<<3)+(0<<1)+1;
this.write_reg(`SLV0_RW_ADDR, wr_val); // 把值写进去
this.read_reg(`SLV0_RW_ADDR, rd_val);//再把写进去的值读回来
void'(this.diff_value(wr_val, rd_val, "SLV0_WR_REG"));//作比较
// slv1 with len=16, prio=1, en=1
wr_val = (2<<3)+(1<<1)+1;
this.write_reg(`SLV1_RW_ADDR, wr_val);
this.read_reg(`SLV1_RW_ADDR, rd_val);
void'(this.diff_value(wr_val, rd_val, "SLV1_WR_REG"));
// slv2 with len=32, prio=2, en=1
wr_val = (3<<3)+(2<<1)+1;
this.write_reg(`SLV2_RW_ADDR, wr_val);
this.read_reg(`SLV2_RW_ADDR, rd_val);
void'(this.diff_value(wr_val, rd_val, "SLV2_WR_REG"));
// send IDLE command
this.idle_reg();
endtask
task do_formatter(); //定义了fmt的fifo为LONG_FIFO, HIGH_WIDTH
void'(fmt_gen.randomize() with {fifo == LONG_FIFO; bandwidth == HIGH_WIDTH;});
fmt_gen.start();
endtask
task do_data();//发送数据
void'(chnl_gens[0].randomize() with {ntrans==100; ch_id==0; data_nidles==0; pkt_nidles==1; data_size==8; });
void'(chnl_gens[1].randomize() with {ntrans==100; ch_id==1; data_nidles==1; pkt_nidles==4; data_size==16;});
void'(chnl_gens[2].randomize() with {ntrans==100; ch_id==2; data_nidles==2; pkt_nidles==8; data_size==32;});
fork
chnl_gens[0].start();
chnl_gens[1].start();
chnl_gens[2].start();
join
#10us; // wait until all data haven been transfered through MCDF
endtask
endclass
从仿真波形图可以看出,只是一开始的时候3个通道同时发送,但是过了某个时间之后,你会发现已经按通道0、1、2的顺序依次发送了。但是在class env fork join中规定的并行发送。这是为何呢?
fork
this.chnl_agts[0].run();
this.chnl_agts[1].run();
this.chnl_agts[2].run();
join
测试主要从do_reg、do_fmt和do_data来测试不同配置的寄存器、不同的数据。
把写进寄存器的配置读回来,然后比较一下看对不对。
class mcdf_reg_stability_test extends mcdf_base_test;
function new(string name = "mcdf_data_consistence_basic_test");
super.new(name);
endfunction
task do_reg();
bit[7:0] chnl_rw_addrs[] = '{`SLV0_RW_ADDR, `SLV1_RW_ADDR, `SLV2_RW_ADDR};
bit[7:0] chnl_ro_addrs[] = '{`SLV0_R_ADDR, `SLV1_R_ADDR, `SLV2_R_ADDR};
int pwidth = `PAC_LEN_WIDTH + `PRIO_WIDTH + 1;
bit[31:0] check_pattern[] = '{((1<<pwidth)-1), 0, ((1<<pwidth)-1)};
bit[31:0] wr_val, rd_val;
// RW register access and bits toggle
foreach(chnl_rw_addrs[i]) begin
foreach(check_pattern[i]) begin
wr_val = check_pattern[i];
this.write_reg(chnl_rw_addrs[i], wr_val);
this.read_reg(chnl_rw_addrs[i], rd_val);
void'(this.diff_value(wr_val, rd_val));
end
end
// RO register read access
foreach(chnl_ro_addrs[i]) begin
this.read_reg(chnl_ro_addrs[i], rd_val);
end
// send IDLE command
this.idle_reg();
endtask
endclass
check_pattern[]中的数就是要写进寄存器里的数,此处的do_reg先把数写进reg,再读回来看是否一致。
寄存器的相关说明:
地址0x00 通道1控制寄存器 32bits 读写寄存器
bit(0):通道使能信号。1为打开,0位关闭。复位值为1。 bit(2:1):优先级。0为最高,3为最低。复位值为3。
bit(5:3):数据包长度,解码对应表为,
0对应长度4,1对应长度8,2对应长度16,3对应长度32,其它数值(4-7)均暂时对应长度32。复位值为0。
bit(31:6):保留位,无法写入。复位值为0。
class mcdf_reg_illegal_access_test extends mcdf_base_test;
function new(string name = "mcdf_reg_illegal_access_test");
super.new(name);
endfunction
task do_reg();
bit[7:0] chnl_rw_addrs[] = '{`SLV0_RW_ADDR, `SLV1_RW_ADDR, `SLV2_RW_ADDR};
bit[7:0] chnl_ro_addrs[] = '{`SLV0_R_ADDR, `SLV1_R_ADDR, `SLV2_R_ADDR};
int pwidth = `PAC_LEN_WIDTH + `PRIO_WIDTH + 1; //=6
bit[31:0] check_pattern[] = '{32'h0000_FFC0, 32'hFFFF_0000};
bit[31:0] wr_val, rd_val;
// RW register write reserved field and check
foreach(chnl_rw_addrs[i]) begin
foreach(check_pattern[j]) begin
wr_val = check_pattern[j];
this.write_reg(chnl_rw_addrs[i], wr_val);
this.read_reg(chnl_rw_addrs[i], rd_val);
void'(this.diff_value(wr_val & ((1<<pwidth)-1), rd_val));//将期望值和读出来的值对比
end
end
// RO register write reserved field and check (no care readable field
// value)
foreach(chnl_ro_addrs[i]) begin
wr_val = 32'hFFFF_FF00;
this.write_reg(chnl_ro_addrs[i], wr_val);
this.read_reg(chnl_ro_addrs[i], rd_val);
void'(this.diff_value(0 , rd_val & 32'hFFFFFF00));
end
// send IDLE command
this.idle_reg();
endtask
endclass
pwidth = `PAC_LEN_WIDTH + `PRIO_WIDTH + 1 = 6。
(1<<pwidth)-1='b1000000-1='b0111111。
wr_val & ((1< 数据通道关闭时,mcdf_checker不会收到输入/出端的检测数据,因此也没有数据比较的信息。使能信号en默认初始值位1,当把en改位0后数据通道关闭,测试数据停留在数据通道端口,无法写入。同时ready为低,表示不接收数据。 将不同数据通道配置为相同或者不同的优先级,在数据通道使能的情况下进行测试 如果优先级相同,那么arbiter应该采取轮询机制从各个通道接收数据;如果优先级不同,那么arbiter应该先接收高优先级通道的数据,同时,最终所有的数据都应该从MCDF发送出来。 通过get_field_value函数获取每个chnl的优先级,如果三个优先级都不一样,那么就不会执行轮询,按照原来优先级的高低依次执行。3.54 数据通道开关检查
3.55 优先级测试
task do_arbiter_priority_check();
int id;
forever begin
@(posedge this.arb_vif.clk iff (this.arb_vif.rstn && this.arb_vif.mon_ck.f2a_id_req===1));
id = this.get_slave_id_with_prio(); //id的优先级最高
if(id >= 0) begin
@(posedge this.arb_vif.clk);
if(!(refmod.get_field_value(0,RW_PRIO) == refmod.get_field_value(1,RW_PRIO)
&& refmod.get_field_value(1,RW_PRIO) == refmod.get_field_value(2,RW_PRIO)))
if(this.arb_vif.mon_ck.a2s_acks[id] !== 1) //id的优先级最高,那么对应的a2s_acks应该为1,否则报错
rpt_pkg::rpt_msg("[CHKERR]",
$sformatf("ERROR! %0t arbiter received f2a_id_req===1 and channel[%0d] raising request with high priority, but is not granted by arbiter", $time, id),
rpt_pkg::ERROR,
rpt_pkg::TOP);
end
end
endtask
如果三个优先级都一样,那么就采用轮询机制,不执行接下来信息打印部分,否则就一定会报错。因为id的优先级最高,那么对应的a2s_acks应该为1。而轮询机制并不是按照优先级来控制a2s_acks信号,所以会出现错误。if(!(refmod.get_field_value(0,RW_PRIO) == refmod.get_field_value(1,RW_PRIO)
&& refmod.get_field_value(1,RW_PRIO) == refmod.get_field_value(2,RW_PRIO)))
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