通过上 一节的学习已经能够实现通过ISE搭建DDR IP CORE并且顺利通例程的仿真,那么接下来的这一一节我们就要根据ISE给的Example 来搭建自己所需要的仿真平台。

     第一:对ISE给定的Example 要有所了解,包括结构和内容;如图所示:其中docs 文件中是DDR IPCore的使用手册和指导文档;example_design存放的是ISE官方给出的仿真例程,即一个完整的DDR IP的工程,user_design 文件下存放的是与DDR IP 相关的一些文件。这里我们用到的example _design 文件多一些。

 

 

 第二:开始搭建仿真平台;

          (1)将上文提到的example _design 文件拷贝到 一个相对独立的路径下面,如下图所示;

 

 

       (2)创建ISE工程,把创建的工程路径放到我们拷贝的example _ design 文件下。然后添加example_design->rtl文件下(包括rtl下子文件里面的所有)的所有.v文件;添加xample_design->par文件下的example_design.ucf 文件;添加example_design->sim->function文件下的(ddr3_model_c3.v仿真模型文件,ddr3_model_pararmeters_c3.v模型参数文件,sim_tb_top文件激励文件),点击MODESIM开始仿真

 

 

   (2)仿真的时候会出现需要把,仿真模型的参数文件拷贝到example_design所在的文件夹下,(就是在色的仿真路径下),还会出现一些其他错误,对应的修改一下就好。仿真过后会出现一些错误,当出现TESTpassed时,说明搭建成功。

 第三:  接下来就是搭建自己的所DDR工程了

         (1)添加ddr_top.v文件。就添加在之前我们建好的USB工程当中,如下图所示。

 

 

   (2)在这个ddr_top.v 中对DDR IPcore例化进来,就是加入mig_39_2.xco文件。找到其中的例化模板,复制到ddr_top.v 文件当中。如下图所示,其中包括ddr对一些参数的设置。

 

 

 

    (3)例化DDR中对参数的设置如下;当然这些事工程自己生成的,你也可以更改一些,

 1 mig_39_2 # (
 2     .C3_P0_MASK_SIZE(8),
 3     .C3_P0_DATA_PORT_SIZE(64),
 4     .C3_P1_MASK_SIZE(8),
 5     .C3_P1_DATA_PORT_SIZE(64),
 6     .DEBUG_EN(0),
 7     .C3_MEMCLK_PERIOD(3200),//当前的时钟周期
 8     .C3_CALIB_SOFT_IP("TRUE"),
 9     .C3_SIMULATION("TRUE"),//仿真
10     .C3_RST_ACT_LOW(1),//复位信号的配置
11     .C3_INPUT_CLK_TYPE("SINGLE_ENDED"),//时钟模式
12     .C3_MEM_ADDR_ORDER("BANK_ROW_COLUMN"),//内存读取的顺序模式
13     .C3_NUM_DQ_PINS(16),
14     .C3_MEM_ADDR_WIDTH(13),
15     .C3_MEM_BANKADDR_WIDTH(3)
16 )

     DDR的接口介绍;

 (c3_calib_done), //全局完成初始化标志,在此信号没有拉高之前,不能对DDR3进行操作。,从代码中可以看出,DDR3的端口分成了两部分,分别是DDR3的芯片接口以及提供给用户的逻辑操作接口。
  1 u_mig_39_2 (
  2    //DDR3 的接口
  3   .c3_sys_clk             (c3_sys_clk),//input  DDR3的参考时钟
  4   .c3_sys_rst_i           (c3_sys_rst_i), //input DDR3的复位信号                       
  5 
  6   .mcb3_dram_dq           (mcb3_dram_dq),  
  7   .mcb3_dram_a            (mcb3_dram_a),  
  8   .mcb3_dram_ba           (mcb3_dram_ba),
  9   .mcb3_dram_ras_n        (mcb3_dram_ras_n),                        
 10   .mcb3_dram_cas_n        (mcb3_dram_cas_n),                        
 11   .mcb3_dram_we_n         (mcb3_dram_we_n),                          
 12   .mcb3_dram_odt          (mcb3_dram_odt),
 13   .mcb3_dram_cke          (mcb3_dram_cke),                          
 14   .mcb3_dram_ck           (mcb3_dram_ck),                          
 15   .mcb3_dram_ck_n         (mcb3_dram_ck_n),       
 16   .mcb3_dram_dqs          (mcb3_dram_dqs),                          
 17   .mcb3_dram_dqs_n        (mcb3_dram_dqs_n),
 18   .mcb3_dram_udqs         (mcb3_dram_udqs),    // for X16 parts                        
 19   .mcb3_dram_udqs_n       (mcb3_dram_udqs_n),  // for X16 parts
 20   .mcb3_dram_udm          (mcb3_dram_udm),     // for X16 parts
 21   .mcb3_dram_dm           (mcb3_dram_dm),
 22   .mcb3_dram_reset_n      (mcb3_dram_reset_n),
 23   
 24   
 25   
 26   
 27   //sppourt for user 
 28   .c3_clk0                    (c3_clk0),//output     输出给用户提供的
 29   .c3_rst0                    (c3_rst0),//output     输出给用户提供的
 30     
 31  
 32 
 33   .c3_calib_done             (c3_calib_done), //全局完成初始化标志
 34      .mcb3_rzq               (  mcb3_rzq   ),  
 35                                 
 36      .mcb3_zio               (mcb3_zio   ),
 37     
 38     //P0,p1表示两个用户会接口
 39     /*********************command path****************************/
 40    .c3_p0_cmd_clk                          (c3_clk0   ),  //命令FIFO的用户时钟。 FIFO信号是 在这个时钟的上升沿捕获。
 41    .c3_p0_cmd_en                           (p0_cmd_en),   //该高电平有效信号是用于写入的写入使能信号命令FIFO。        
 42    .c3_p0_cmd_instr                        (p0_cmd_instr),     //当前指令的命令代码。 位0表示READ / WRITE选择,Bit 1为Auto预充电启用,位2代表刷新总是优先考虑                                           
 43    .c3_p0_cmd_bl                           (p0_cmd_bl), //当前用户字数的突发长度交易。 突发长度编码为0到63,代表1到64个用户词(例如,6'b00011 是一个突发长度4的交易)。 用户字宽等于端口宽度(例如,突发长度为3 64位端口传输3 x 64位用户字= 192位 总)。              
 44        /*当前事务的字节起始地址。地址
 45        必须与端口大小对齐:
 46        32位端口:低两位必须为0。
 47        64位端口:低三位必须为0。
 48        128位端口:低4位必须为0*/
 49    .c3_p0_cmd_byte_addr                    (p0_cmd_addr),
 50                            
 51    .c3_p0_cmd_empty                        (            ), //这个命令FIFO的高电平有效空标志                                 
 52    .c3_p0_cmd_full                         (            ),  //此高电平有效输出是命令的man标志 
 53    
 54   /*********************write cmd****************************/    
 55    .c3_p0_wr_clk                           (c3_clk0       ),//该信号是写数据FIFO的用户时钟 
 56    /*该高电平有效信号是写使能
 57     用于写数据FIFO。它表明了
 58     pX_wr_data上的值有效
 59     加载到FIFO。数据已加载
 60     pX_wr_clk的上升沿时
 61     pX_wr_en = 1且pX_wr_full = 0。*/       
 62    .c3_p0_wr_en                            (p0_wr_en),            
 63    .c3_p0_wr_mask                          (p0_wr_mask),//写数据的掩码,
 64    /*写入要写入的数据值
 65     数据FIFO并发送到内存。 PX_SIZE
 66     可以是32位,64位或128位,具体取决于
 67     端口配置*/      
 68    .c3_p0_wr_data                          (p0_wr_data),                                 
 69    .c3_p0_wr_full                          (             ), //高有效的满信号
 70    .c3_p0_wr_empty                         (             ),//高有效的空信号
 71    /*写入数据FIFO的计数值。这个
 72     输出表示有多少用户单词
 73     在FIFO中(从1到64)。计数值为
 74     0表示FIFO为空。这个信号
 75     延迟的延迟比
 76     pX_wr_empty标志。因此,FIFO
 77     可能是空的或经历不足
 78     即使计数不为0。*/
 79    .c3_p0_wr_count                         (             ),
 80    .c3_p0_wr_underrun                      (             ),//高电平有效,欠载标志。
 81    .c3_p0_wr_error                         (             ), 
 82    /*********************read  cmd****************************/  
 83    .c3_p0_rd_clk                           (c3_p0_rd_clk  ),//该信号是du数据FIFO的用户时钟
 84    .c3_p0_rd_en                            (c3_p0_rd_en   ),
 85    .c3_p0_rd_data                          (c3_p0_rd_data ),
 86    .c3_p0_rd_full                          (c3_p0_rd_full ),
 87    .c3_p0_rd_empty                         (c3_p0_rd_empty),
 88    .c3_p0_rd_count                         (c3_p0_rd_count),
 89    .c3_p0_rd_overflow                      (c3_p0_rd_overflow),
 90    .c3_p0_rd_error                         (c3_p0_rd_error   ),
 91    /********************P1  user port************************/
 92    .c3_p1_cmd_clk                          (c3_p1_cmd_clk    ),
 93    .c3_p1_cmd_en                           (c3_p1_cmd_en     ),
 94    .c3_p1_cmd_instr                        (c3_p1_cmd_instr  ),
 95    .c3_p1_cmd_bl                           (c3_p1_cmd_bl     ),
 96    .c3_p1_cmd_byte_addr                    (c3_p1_cmd_byte_addr),
 97    .c3_p1_cmd_empty                        (c3_p1_cmd_empty    ),
 98    .c3_p1_cmd_full                         (c3_p1_cmd_full     ),
 99    .c3_p1_wr_clk                           (c3_p1_wr_clk),
100    .c3_p1_wr_en                            (c3_p1_wr_en),
101    .c3_p1_wr_mask                          (c3_p1_wr_mask),
102    .c3_p1_wr_data                          (c3_p1_wr_data),
103    .c3_p1_wr_full                          (c3_p1_wr_full),
104    .c3_p1_wr_empty                         (c3_p1_wr_empty),
105    .c3_p1_wr_count                         (c3_p1_wr_count),
106    .c3_p1_wr_underrun                      (c3_p1_wr_underrun),
107    .c3_p1_wr_error                         (c3_p1_wr_error),
108    .c3_p1_rd_clk                           (c3_p1_rd_clk),
109    .c3_p1_rd_en                            (c3_p1_rd_en),
110    .c3_p1_rd_data                          (c3_p1_rd_data),
111    .c3_p1_rd_full                          (c3_p1_rd_full),
112    .c3_p1_rd_empty                         (c3_p1_rd_empty),
113    .c3_p1_rd_count                         (c3_p1_rd_count),
114    .c3_p1_rd_overflow                      (c3_p1_rd_overflow),
115    .c3_p1_rd_error                         (c3_p1_rd_error)
116 );

      (3)从上文中所提到的Example_design 文件中把DDr所有的顶层接口复制到ddr_top.v文件中:

 1 //sysyterm  interface
 2    input                                            c3_sys_clk          ,  
 3    input                                            c3_sys_rst_i        , 
 4    //ddr3 interface 
 5    inout     [15:0]                                    mcb3_dram_dq        ,
 6    output wire [12:0]                               mcb3_dram_a         ,
 7    output wire [2:0]                                mcb3_dram_ba        ,
 8    output wire                                      mcb3_dram_ras_n     ,
 9    output wire                                      mcb3_dram_cas_n     ,
10    output wire                                      mcb3_dram_we_n      ,
11    output wire                                      mcb3_dram_odt       ,
12    output wire                                      mcb3_dram_reset_n   ,
13    output wire                                      mcb3_dram_cke       ,
14    output wire                                      mcb3_dram_dm        ,
15    inout                                            mcb3_dram_udqs      ,
16    inout                                            mcb3_dram_udqs_n    ,
17    inout                                            mcb3_rzq            ,
18    inout                                            mcb3_zio            ,
19    output wire                                      mcb3_dram_udm       ,
20    inout                                            mcb3_dram_dqs       ,
21    inout                                            mcb3_dram_dqs_n     ,
22    output wire                                      mcb3_dram_ck        ,
23    output wire                                      mcb3_dram_ck_n      ,

其中例程中给出的为如下所示:

 1 module example_top #
 2 (
 3    parameter C3_P0_MASK_SIZE           = 8,
 4    parameter C3_P0_DATA_PORT_SIZE      = 64,
 5    parameter C3_P1_MASK_SIZE           = 8,
 6    parameter C3_P1_DATA_PORT_SIZE      = 64,
 7    parameter DEBUG_EN                = 0,       
 8                                        // # = 1, Enable debug signals/controls,
 9                                        //   = 0, Disable debug signals/controls.
10    parameter C3_MEMCLK_PERIOD        = 3200,       
11                                        // Memory data transfer clock period
12    parameter C3_CALIB_SOFT_IP        = "TRUE",       
13                                        // # = TRUE, Enables the soft calibration logic,
14                                        // # = FALSE, Disables the soft calibration logic.
15    parameter C3_SIMULATION           = "FALSE",       
16                                        // # = TRUE, Simulating the design. Useful to reduce the simulation time,
17                                        // # = FALSE, Implementing the design.
18    parameter C3_HW_TESTING           = "FALSE",       
19                                        // Determines the address space accessed by the traffic generator,
20                                        // # = FALSE, Smaller address space,
21                                        // # = TRUE, Large address space.
22    parameter C3_RST_ACT_LOW          = 0,       
23                                        // # = 1 for active low reset,
24                                        // # = 0 for active high reset.
25    parameter C3_INPUT_CLK_TYPE       = "DIFFERENTIAL",       
26                                        // input clock type DIFFERENTIAL or SINGLE_ENDED
27    parameter C3_MEM_ADDR_ORDER       = "BANK_ROW_COLUMN",       
28                                        // The order in which user address is provided to the memory controller,
29                                        // ROW_BANK_COLUMN or BANK_ROW_COLUMN
30    parameter C3_NUM_DQ_PINS          = 16,       
31                                        // External memory data width
32    parameter C3_MEM_ADDR_WIDTH       = 13,       
33                                        // External memory address width
34    parameter C3_MEM_BANKADDR_WIDTH   = 3        
35                                        // External memory bank address width
36 )    
37 
38 (
39    output                                           calib_done,
40    output                                           error,
41    inout  [C3_NUM_DQ_PINS-1:0]                      mcb3_dram_dq,
42    output [C3_MEM_ADDR_WIDTH-1:0]                   mcb3_dram_a,
43    output [C3_MEM_BANKADDR_WIDTH-1:0]               mcb3_dram_ba,
44    output                                           mcb3_dram_ras_n,
45    output                                           mcb3_dram_cas_n,
46    output                                           mcb3_dram_we_n,
47    output                                           mcb3_dram_odt,
48    output                                           mcb3_dram_reset_n,
49    output                                           mcb3_dram_cke,
50    output                                           mcb3_dram_dm,
51    inout                                            mcb3_dram_udqs,
52    inout                                            mcb3_dram_udqs_n,
53    inout                                            mcb3_rzq,
54    inout                                            mcb3_zio,
55    output                                           mcb3_dram_udm,
56    input                                            c3_sys_clk_p,
57    input                                            c3_sys_clk_n,
58    input                                            c3_sys_rst_i,
59    inout                                            mcb3_dram_dqs,
60    inout                                            mcb3_dram_dqs_n,
61    output                                           mcb3_dram_ck,
62    output                                           mcb3_dram_ck_n
63 );

第四:创建TB激励文件;主要是根据历程中来创建的。

`timescale    1ps/1ps


module      tb_ddr_top ;

reg                                      ddr3_ref_clk         ;
reg                                      ddr3_rst_n           ;
//bebug   signals 
reg                                      wr_trig              ;
wire                                     c3_calib_done        ;

//ddr3 interface 
wire [15:0]                               mcb3_dram_dq        ;
wire [12:0]                               mcb3_dram_a         ;
wire [2:0]                                mcb3_dram_ba        ;
wire                                      mcb3_dram_ras_n     ;
wire                                      mcb3_dram_cas_n     ;
wire                                      mcb3_dram_we_n      ;
wire                                      mcb3_dram_odt       ;
wire                                      mcb3_dram_reset_n   ;
wire                                      mcb3_dram_cke       ;
wire                                      mcb3_dram_dm        ;
wire                                      mcb3_dram_udqs      ;
wire                                      mcb3_dram_udqs_n    ;
wire                                      mcb3_rzq            ;
wire                                      mcb3_zio            ;
wire                                      mcb3_dram_udm       ;
wire                                      mcb3_dram_dqs       ;
wire                                      mcb3_dram_dqs_n     ;
wire                                      mcb3_dram_ck        ;
wire                                      mcb3_dram_ck_n      ;




parameter C3_MEMCLK_PERIOD     = 3200;


initial    begin
    
        ddr3_ref_clk     =     1;
        ddr3_rst_n       =     0;
        #20000;
        ddr3_rst_n       =     1;    
    
    
end 




//produce debug  signals 
initial    begin
          wr_trig      <=     0;
          @(posedge c3_calib_done)
          #100000
          wr_trig      <=     1;
          #25600
          wr_trig      <=     0;
end 




always   #(C3_MEMCLK_PERIOD/2)  ddr3_ref_clk     =     ~ddr3_ref_clk ;


 ddr_top   ddr_top_inst(

   
   
   //sysyterm  interface
   .c3_sys_clk                               (ddr3_ref_clk       ),  
   .c3_sys_rst_i                             (ddr3_rst_n         ), 
   //ddr3 interface 
   .mcb3_dram_dq                             (mcb3_dram_dq       ),
   .mcb3_dram_a                              (mcb3_dram_a        ),
   .mcb3_dram_ba                             (mcb3_dram_ba       ),
   .mcb3_dram_ras_n                          (mcb3_dram_ras_n    ),
   .mcb3_dram_cas_n                          (mcb3_dram_cas_n    ),
   .mcb3_dram_we_n                           (mcb3_dram_we_n     ),
   .mcb3_dram_odt                            (mcb3_dram_odt      ),
   .mcb3_dram_reset_n                        (mcb3_dram_reset_n  ),
   .mcb3_dram_cke                            (mcb3_dram_cke      ),
   .mcb3_dram_dm                             (mcb3_dram_dm       ),
   .mcb3_dram_udqs                           (mcb3_dram_udqs     ),
   .mcb3_dram_udqs_n                         (mcb3_dram_udqs_n   ),
   .mcb3_rzq                                 (mcb3_rzq           ),
   .mcb3_zio                                 (mcb3_zio           ),
   .mcb3_dram_udm                            (mcb3_dram_udm      ),
   .mcb3_dram_dqs                            (mcb3_dram_dqs      ),
   .mcb3_dram_dqs_n                          (mcb3_dram_dqs_n    ),
   .mcb3_dram_ck                             (mcb3_dram_ck       ),
   .mcb3_dram_ck_n                           (mcb3_dram_ck_n     ),
   //debug   signals 
   .wr_trig                                   (wr_trig)          ,
   .c3_calib_done                            (c3_calib_done)

);

 ddr3_model_c3 u_mem_c3(                             
  .ck         (mcb3_dram_ck),                        
  .ck_n       (mcb3_dram_ck_n),                      
  .cke        (mcb3_dram_cke),                       
  .cs_n       (1'b0),                                
  .ras_n      (mcb3_dram_ras_n),                     
  .cas_n      (mcb3_dram_cas_n),                  
  .we_n       (mcb3_dram_we_n),                      
  .dm_tdqs    ({mcb3_dram_udm,mcb3_dram_dm}),        
  .ba         (mcb3_dram_ba),                        
  .addr       (mcb3_dram_a),                         
  .dq         (mcb3_dram_dq),                        
  .dqs        ({mcb3_dram_udqs,mcb3_dram_dqs}),      
  .dqs_n      ({mcb3_dram_udqs_n,mcb3_dram_dqs_n}),  
  .tdqs_n     (),                                    
  .odt        (mcb3_dram_odt),                       
  .rst_n      (mcb3_dram_reset_n)                    
  ); 
  
// The PULLDOWN component is connected to the ZIO signal primarily to avoid the    
// unknown state in simulation. In real hardware, ZIO should be a no connect(NC) pin. 
   PULLDOWN zio_pulldown3 (.O(zio3));   PULLDOWN rzq_pulldown3 (.O(rzq3));            
                                                                                      

  
     endmodule                                                 

这样自己搭建的就好了。有些细节小问题,没讲,不懂得化联系我吧,一起进步;