Xilinx DDR3学习总结——1、MIG核设置

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前言

话说之前从来没有使用过DDR，工作中的项目都是流式处理的，没有一个大存储的需求，应该图像处理中DDR用的会比较多一些，但是一个这么常用的东西不预先学习一下也不像话，在这里，也就记录一下学习的过程。参考其他优秀的博主的文章，现学现会。

开发板 DDR信息

开发板手册的介绍信息：
开发板上有4个DDR3颗粒，单片DDR内存大小是512MB，数据接口是16bit，四片DDR3内存共有2GB。内存数据主频高达1600MHZ,数据带宽可达1600MHz*64bit

DDR3型号：MT41K256M16TW-107

根据型号计算：256M*16bit = 512MB，容量没错

多片DDR连接时，地址引脚是完全一致的，不同的是数据位以及对应的数据标志的一些扩展 4片DDR3则DQ变成了64bit。
数据主频高达1600MHz，那么IO时钟（怎么描述呢？）为800MHz，时钟比为4:1，那么用户时钟是200MHz

MIG 设置

下面直接对MIG进行设置，虽然有4片DDR3,但还是从一片开始使用吧

上面这个红色方框要注意，每次重新打开MIG IP的时候，这个值又会变成默认值。这个系统时钟经常使用200MHz，是因为除了这个时钟输入，还需输入一个参考时钟，参考时钟固定为200MHz，如果系统时钟时钟也是200MHz的，那么这两个时钟就可以合并为一个。
熟悉Xilinx IO Delay相关结构的都知道，需要对IO做微小延迟调整的时候，用的时钟就是200MHz

系统时钟使用200MHz的时候，上图的红色方框参考时钟可以与系统时钟是同一个端口

因为我们事先准备好了引脚定义，所以选择FIxed

然后读入UCF文件

NET   "ddr3_addr[0]"      LOC = "AC11"  |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_addr[10]"     LOC = "AJ11"  |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_addr[11]"     LOC = "AC10"  |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_addr[12]"     LOC = "AD8"   |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_addr[13]"     LOC = "AE11"  |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_addr[14]"     LOC = "AB8"   |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_addr[1]"      LOC = "AD9"   |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_addr[2]"      LOC = "AA10"  |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_addr[3]"      LOC = "AH9"   |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_addr[4]"      LOC = "AC9"   |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_addr[5]"      LOC = "AH10"  |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_addr[6]"      LOC = "AB9"   |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_addr[7]"      LOC = "AG10"  |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_addr[8]"      LOC = "AA8"   |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_addr[9]"      LOC = "AF10"  |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_ba[0]"        LOC = "AJ9"   |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_ba[1]"        LOC = "AE8"   |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_ba[2]"        LOC = "AD11"  |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_cas_n"        LOC = "AE10"  |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_ck_n[0]"      LOC = "AJ14"  |     IOSTANDARD = DIFF_SSTL135         |     VCCAUX_IO = HIGH  ;
NET   "ddr3_ck_p[0]"      LOC = "AH14"  |     IOSTANDARD = DIFF_SSTL135         |     VCCAUX_IO = HIGH  ;
NET   "ddr3_cke[0]"       LOC = "AK11"  |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_cs_n[0]"      LOC = "AK9"   |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dm[0]"        LOC = "AK3"   |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dm[1]"        LOC = "AC4"   |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dq[0]"        LOC = "AK1"   |     IOSTANDARD = SSTL135_T_DCI        |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dq[10]"       LOC = "AD6"   |     IOSTANDARD = SSTL135_T_DCI        |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dq[11]"       LOC = "AC5"   |     IOSTANDARD = SSTL135_T_DCI        |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dq[12]"       LOC = "AD3"   |     IOSTANDARD = SSTL135_T_DCI        |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dq[13]"       LOC = "AC7"   |     IOSTANDARD = SSTL135_T_DCI        |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dq[14]"       LOC = "AE6"   |     IOSTANDARD = SSTL135_T_DCI        |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dq[15]"       LOC = "AC2"   |     IOSTANDARD = SSTL135_T_DCI        |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dq[1]"        LOC = "AJ3"   |     IOSTANDARD = SSTL135_T_DCI        |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dq[2]"        LOC = "AJ1"   |     IOSTANDARD = SSTL135_T_DCI        |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dq[3]"        LOC = "AJ4"   |     IOSTANDARD = SSTL135_T_DCI        |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dq[4]"        LOC = "AH2"   |     IOSTANDARD = SSTL135_T_DCI        |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dq[5]"        LOC = "AH6"   |     IOSTANDARD = SSTL135_T_DCI        |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dq[6]"        LOC = "AJ2"   |     IOSTANDARD = SSTL135_T_DCI        |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dq[7]"        LOC = "AH5"   |     IOSTANDARD = SSTL135_T_DCI        |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dq[8]"        LOC = "AD4"   |     IOSTANDARD = SSTL135_T_DCI        |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dq[9]"        LOC = "AC1"   |     IOSTANDARD = SSTL135_T_DCI        |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dqs_n[0]"     LOC = "AH1"   |     IOSTANDARD = DIFF_SSTL135_T_DCI   |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dqs_n[1]"     LOC = "AD1"   |     IOSTANDARD = DIFF_SSTL135_T_DCI   |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dqs_p[0]"     LOC = "AG2"   |     IOSTANDARD = DIFF_SSTL135_T_DCI   |     VCCAUX_IO = HIGH  ;
NET   "ddr3_dqs_p[1]"     LOC = "AD2"   |     IOSTANDARD = DIFF_SSTL135_T_DCI   |     VCCAUX_IO = HIGH  ;
NET   "ddr3_odt[0]"       LOC = "AK10"  |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_ras_n"        LOC = "AG9"   |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_reset_n"      LOC = "AB10"  |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;
NET   "ddr3_we_n"         LOC = "AE9"   |     IOSTANDARD = SSTL135              |     VCCAUX_IO = HIGH  ;

读入之后需要点击验证，验证成功了才能进行下一步。
接下来也就一路下一步，那么也就配置完成了

IP核生成完成之后，直接在IP核上右键，点击生成example，vivado会生成一个参考设计工程，这样我们的第一步就完成了