答：在做样板工程时要注意一个问题：Due to the library paths that are coded into the Quartus settings for this project, if a user wishes to modify the hardware design they must first strip out any old paths from within the project settings file (qsf)

在qsf文件中找到类似语句

set_global_assignment-nameVHDL_FILE C:/MegaCore/ddr_ddr2_sdram-v3.2.0/lib/auk_ddr_tb_functions.vhd"这里的目录是初始的目录，把它改为正确的目录。

　　18.在NIOS II IDE编译时出现如下错误是怎么回事？

system_des cription/alt_sys_init.c:75: error: `ONCHIP_MEMORY_BASE' undeclared here (not in a function)

system_des cription/alt_sys_init.c:75: error: initializer element is not constant

system_des cription/alt_sys_init.c:75: error: (near initialization for `ext_flash.dev.write')

system_des cription/alt_sys_init.c:75: error: initializer element is not constant

system_des cription/alt_sys_init.c:75: error: (near initialization for `ext_flash.dev.read')

答：ONCHIP_MEMORY_BASE没有赋值，在alt_sys_init.c 程序的开头加上#define ONCHIP_MEMORY_BASE 0x00000000后面的这个地址要与SOPC中的对应。

　　19. 在NIOS II IDE编译时出现如下错误是怎么回事？

Pausing target processor: not responding.

Resetting and trying again: FAILED

Leaving target processor paused

　　答：以下是一位FAE的回答：

1. 关于USB-Blaster在Nios II IDE下载时会发生偶发性错误，这种现象主要是IDE software与Nios II CPU透过USB-Blaster在做通讯时发生错误，若是确认FPG上配置没有错误，连续发生错误的机率应该是相当的低，您只需要重新下载即可。

2. 若您使用Nios II IDE 6.0，请尽量配合SOPC Builder 6.0重新build您的system，并且使用Quartus II 6.0重新compile您的project，以减少CPU与IDE software不兼容的情形。

　　20.在NIOS II IDE中工程的System Library选项中的这几个选项代表什么意思？.text .rodata .rwdata 与reset .exception这几个地址之间的关系是什么？

　　答：.text : 代码区 .rodata:只读数据区，一般存放静态全局变量 .rwdata:可读写变量数据区另外还有.bss:存放未被初始化的变量。
■ .text — the actual executable code

■ .rodata — any read only data used in the execution of the code

■ .rwdata — where read/write variables and pointers are stored

■ heap — where dynamically allocated memory is located

■ stack — where function call parameters and other temporary data is stored