使用Spartan3A_DSP在上电和crc错误期间加载的默认多引导映像是什么？

对于从PLatform闪存进行Spartan-3A配置，将首先配置默认映像。
这可以通过内部修订位或外部REV_SEL引脚设置。
使能外部选择引脚（EN_EXT_SEL）确定是使用外部引脚还是内部位来选择设计修订版。
有关使用XCFxxP的多重引导，请参阅 -  http://www.xilinx.com/support/documentation/application_notes/xapp483.pdf
如果在Spartan-3A上使用Multiboot，我强烈建议使用SPI或BPI flah。
这些是更常见的解决方案。



以下为原文

For Spartan-3A configuring from a PLatform flash the default image will be configured first. This can be set by the internal revision bits OR the external REV_SEL pins. The Enable External Select pin (EN_EXT_SEL) determines if the external pins or internal bits
are used to select the design revision. For Multiboot with the XCFxxP refer to - http://www.xilinx.com/support/documentation/application_notes/xapp483.pdf
 
If using Multiboot with Spartan-3A I wouls strongly recommend using an SPI or BPI flah. These are more common solutions.

嗨mcgovern
感谢您的答复。
我很高兴有人有回应。
目前，我正在探索Xilinx Platform Flash＆amp; amp;
SPI Flash用于多重启动。
对于Platform Flash，我正密切关注xapp483中所述的推荐设计。
但是，我对使用Platform Flash有一些疑问。
它们如下：
1）我应该将fpga配置为Master还是Slave？
应用笔记似乎将CCLK从fpga引入Platform Flash。
然而，与此同时，它将CSI_B＆amp;
RDWR_B用于从并行。
2）要从Platform Flash接收用户标记（例如0x99），是否需要使用CCLK为第一个数据输出时钟？
3）当使用Platform Flash多重引导时，是否可以在每次有图像1的配置时加载默认图像（例如图像1）但是只要有图像1的配置就重新加载另一个图像（例如图像2）？如果没有，可以
我是用SPI Flash做的吗？
希望早日收到你的消息。
谢谢。



以下为原文

Hi mcgovern
 
Thank you for your response. I am so glad that someone had responses. Currently, I am exploring  with both Xilinx Platform Flash & SPI Flash for multiboot. For Platform Flash, I am following closely the recommended design stated in xapp483. However, I have some doubts on using Platform Flash. They are as follows:
 
1) Should I configure the fpga as Master or Slave? The application notes seems to draw the CCLK from the fpga to the Platform Flash. However, at the same time, it grounded CSI_B & RDWR_B which is used for Slave Parallel.
2) To receive the user mark (e.g 0x99) from the Platform Flash, do I need to use CCLK to clock the first data out?
3) When using Platform Flash for multibooting, is it possible that I load a default image (e.g. image 1) whenever there is a powerup but reload another image (e..g image 2) whenever there is a configuration of image 1? If not, can I do it with SPI Flash?
 
Hope to hear from you soon. Thanks.