原创 sdram的实验中nios run不成功的问题

具体问题：

我直接用店主提供的EP2C5Q208_NIOS的实例，把sdram解压缩后，copy到D:\sopc\sdram下。用quartus打开，重新编译，下载，可以成功。在nios 2中新建project，主程序就是copy例子中的主程序。run as -》nios 2 hardware .提示说：The specified jtag device(in the Target Connection tab) is invalid。

在run/run..对话框中进一步提示说：Target connection 中“Select a JTAG device. If none are available, try a different cable.”但是

JTAG Device 选项呈灰色，无法选择。这是怎么回事呀？

补充nios 2 debug提示：

Reading System ID at address 0x01001038:
    ID value does not match: read 0x27515621; expected 0x27A8AA11
    Timestamp value does not match: image on board is older than expected
    Read timestamp  4:12:00 2009/02/05; expected 16:43:52 2009/03/22
The software you are downloading may not run on the system which is currently
configured into the device.  Please download the correct SOF or recompile.
Leaving target processor paused

是说systemid和我的硬件不符合？原来的例子是适合店主所用的硬件不适合我的？

解决方法：

我把quartus的project重新打开，把不用的input高阻。

配置芯片设置为epcs4.重新编译，下载。

nios注意workspace要和硬件project一致！！程序再编译，运行，就可以了。

但是nios还是报红色的warning

nios2-terminal: Warning: The JTAG cable you are using is not supported for Nios
nios2-terminal: II systems.  You may experience intermittent JTAG communication
nios2-terminal: failures with this cable.  Please use a USB Blaster revision B
nios2-terminal: cable or another supported cable.  Please refer to the file
nios2-terminal: errata.txt included in the Nios II development kit documents
nios2-terminal: directory for more information.

但是程序却在板子上正常运行了。