怎么使用ICAP回读Virtex II-Pro

大家好，我正试图通过ICAP部分重新配置我的设备（ML310板上的XC2VP30）。
我把我的ICAP附在OPB上，附在Microblaze上。
在bitgen.ut文件中，我将模式引脚（M2M1M0）的值设置为1（PULLUP）。
因此在101上没有设置JTAG模式。
我还确保没有设置持久位。
同样，我的HWICAP的基地址和高地址是0x42000000和0x42000fff，如HWICAP数据表中所述。
我的系统（处理器和OPB总线）时钟频率为25 MHz，以确保ICAP正常。
系统包含一个定时器，一个SysAce，一个hwicap，一个uartlite和一个opb-mdm（用于调试），所有这些都连接到opb。
微纤维也有一些本地记忆。
我也在使用EDK，ISE 8.2。
这是关于我的系统的整个设置。
现在问题是：我只需要通过ICAP来衡量重新配置的延迟。
以下是我实现的非常简单的C代码，用于读取框架并在屏幕上打印内容。
后来我想写一些东西到一个帧并再次读回来只是为了确保实际上它改变了重新配置。
首先，我初始化ICAP模块，然后调用XHwIcap_DeviceReadFrame（），然后通过XHwIcap_StorageBufferRead（）读取配置。
XHwIcap my_icap;
XStatus icap_stat;
icap_stat = XHwIcap_Initialize（＆amp; my_icap，XPAR_OPB_HWICAP_0_DEVICE_ID，XHI_READ_DEVICEID_FROM_ICAP）;
if（icap_stat！= XST_SUCCESS）print（“ n初始化不成功!!  n”）;
Xuint32 frame_content;
icap_stat = XHwIcap_DeviceReadFrame（＆amp; my_icap，XHI_FAR_CLB_BLOCK，32,32）;
if（icap_stat！= XST_SUCCESS）print（“ n有一些东西在读取帧！ n”）;
for（i = 0; i {print（“word number”）; putnum（i + 1）; print（“等于：”）; frame_content = XHwIcap_StorageBufferRead（＆amp; my_icap，i）; putnum（frame_content）; putchar
（' n'）;}
问题是当我回读框架时，除了前7个单词之外，一切都是0，无论它是什么框架。
我仔细研究了ICAP的驱动程序功能及其实现。
我知道驱动程序将前7个字写入存储缓冲区，基本上是伪字，同步字，设置CMD寄存器，设置FAR寄存器等。虽然我还没有确认要回读这些是应该发送的字
ICAP但听起来合情合理。
我读的七个字如下：
30008001 0000000d ffffffff ffffffff 30002001 00404000 2800619c
（我想这应该不是问题，但前4个字与DeviceReadFrame函数中写的不同，我意识到在DeviceReadFrame函数中调用Desync命令后内容发生了变化！）
正如我所提到的，我的问题是我基本上无法正确读取配置框架。
你知道我做错了什么或问题是什么吗？
我被建议使用DeviceRead和DeviceWrite而不是DeviceReadFrame和DeviceWriteFrame。
有没有人在驱动程序中使用这些功能失败的成功？
我也有一些疑问和疑问。
首先，为什么我们应该先读取一个帧，修改它然后再将它写回配置？
我们不能只是写一些东西到设备？
我还没有使用基于差异的重新配置，它可能与此有关。
但是，如果我只想将配置写入一个没有实现任何其他电路的任何其他部分的帧，那么我不能只是在没有先读取并修改它的情况下向该帧写入内容吗？
我的第二个问题是关于HWICAP模块的存储缓冲区。
首先，我认为我必须设置一个opb_bram，以便HWICAP可以使用它。
然而，后来通过研究驱动程序，我意识到HWICAP的基地址与存储缓冲区（即BRAM）相同，所以我得出结论，当我使用HWICAP时，我隐式地为它分配了一个BRAM。
这样吗？
如果没有，请告诉我。
第三个问题是ICAP运行的时钟频率！
我在某处读过最高的66MHz。
它是正确的还是我们可以设置比这更高的时钟？
这个消息变得很长，但如果你能帮助我，我真的很感激。
我已阅读过许多以前关于ICAP的帖子，但找不到足够的信息来解决我的问题。
所以也许这篇文章可以补充它们。
非常感谢，事先



以下为原文

Hi everybody,
I'm trying to partially reconfigure my device (XC2VP30 on ML310 board) through ICAP. I have my ICAP attached to OPB which is attached to Microblaze. In bitgen.ut file I have set the value of mode pins (M2M1M0) to 1 (PULLUP). So it is not set on 101 which is JTAG mode. I also made sure that persist bit is not set. As well the base address and high address of my HWICAP is 0x42000000 and 0x42000fff as mentioned in the datasheet of HWICAP. My system's (processor and OPB bus) clock frequency is 25 MHz to make sure that ICAP is OK with it. The system contains a timer, a SysAce, a hwicap, a uartlite and an opb-mdm (for debugging) all attached to the opb. The microblaze has some local memory too. I'm also using EDK, ISE 8.2. That's the whole setting about my system. Now here is the problem:
I just need to measure the delay of reconfiguration through ICAP. The following is a very simple C code I have implemented to read a frame and print the content on the screen. Later I want to write something to a frame and again read it back just to make sure that in fact it changed the reconfiguration. Firstly I initialize the ICAP module and then invoke XHwIcap_DeviceReadFrame() and then I read the configuration through XHwIcap_StorageBufferRead().

    XHwIcap my_icap;

    XStatus icap_stat;

    icap_stat = XHwIcap_Initialize(&my_icap, XPAR_OPB_HWICAP_0_DEVICE_ID, XHI_READ_DEVICEID_FROM_ICAP);

    if(icap_stat != XST_SUCCESS)
         print("n Initialization not successful!!n");

    Xuint32 frame_content;

    icap_stat = XHwIcap_DeviceReadFrame(&my_icap, XHI_FAR_CLB_BLOCK, 32, 32);

    if(icap_stat != XST_SUCCESS)
         print("n There is something working in reading a frame!n");

        for(i = 0; i < my_icap.WordsPerFrame; i++)
     {
         print("word number");
         putnum(i+1);
         print(" is equal to: ");
         frame_content = XHwIcap_StorageBufferRead(&my_icap, i);
         putnum(frame_content);
         putchar('n');
         }

The problem is when I read back the frame except for the first 7 words everything is 0, no matter what frame it is. I have carefully studied ICAP's driver's functions and their
implementation. I know that the driver writes the first 7 words in the storage buffer which are basically dummy word, sync word, setting CMD register, setting FAR register and etc. While I have not verified that to read back these are the words that should be sent to ICAP but they sound reasonable. The seven words that I read are as follows:

30008001
0000000d
ffffffff
ffffffff
30002001
00404000
2800619c

(I guess this should not be an issue but the first 4 words are different than what was written in DeviceReadFrame function, I realized that the content changes after invoking Desync command in DeviceReadFrame function!)
So as I mentioned, my problem is I can't basically read a frame of configuration correctly. Do you have any idea where I'm doing wrong or what the problem is? I have been advised to use DeviceRead and DeviceWrite instead of DeviceReadFrame and DeviceWriteFrame. Does any one have a successful on unsuccessful experience with these functions in the driver?
As well I have some doubts and questions. Firstly why should we first read a frame, modify it and then write it back to the configuration? Can't we just write something to the device? I haven't still worked with difference-based reconfiguration and it might have something to do with that. But if I just want to write configuration to one frame that doesn't implement any other part of any other circuit, can't I just write something to that frame without first reading it and modifying it?

The second question that I have is about the storage buffer of the HWICAP module. Firstly I thought that I have to set an opb_bram so that HWICAP can use it. However later through studying the driver I realized that the base address for HWICAP is the same as storage buffer (which is the BRAM) so I concluded that when I use a HWICAP I implicitly assign a BRAM to it. Is this so? If not please let me know.

The third question is the clock frequency that ICAP operates! I have read somewhere that the highest is 66MHz. Is it correct or we can set the clock higher than that?

This message became very long, but I really appreciate it if you could kindly help me out with it. I have read many of the previous posts about ICAP but couldn't find enough information to solve my problems. So perhaps this post can be a complement to them.

Thanks a lot beforehand,