SPI启动AN76405是否可以将MOSI和MISO连接到FPGA I/O以及SPI闪存？

嗨，Lumpi，
你应该能够把斯宾林连接到不同的奴隶身上。在你的情况下，他们是FPGA和SpFlash。
CS或SS（从属选择）决定FX3想要通信的设备。
关于这个用例，你看到了什么问题吗？
请让我知道。
谢谢，
西克里希纳。



以下为原文
Hi Lumpi,
You should be able to connect SPI lines to different slaves with out any issue. In your case, they are FPGA and SPI flash.
CS or SS (Slave Select) decides the device that FX3 wants to communicate.
Are you seeing any issue regarding this use case.
Please let me know.
Thanks,
sai krishna.

在MISO上没有上拉是启动过程的关键。一些FPGA有内部的上拉，所以你可能需要增加一个强有力的下拉，以便正确地引导。史蒂夫



以下为原文
It's critical to the boot process that there not be a pull-up on MISO. Some FPGAs have internal pull-ups, so you may need to add a strong pull-down in order to boot properly.

Steve

澄清：浮动米索尔也不好，如果你的启动闪存三态信号。史蒂夫



以下为原文
Clarification: floating MISO is not good either, if your boot flash tri-states that signal.


Steve

HiSai Krishna和史提夫
非常感谢您的建议，我们已经在我们的硬件设计中在MISO线路上附加了下拉。
当做，
隆皮



以下为原文
Hi Sai Krishna and Steve,

thanks a lot for your suggestions we have destined the additional pull down at MISO line in our hardware design.
regards,
lumpi

嗨，现在我有了新硬件，SPI启动不起作用。这是SPI MOSI和MISO线路连接到SPI闪存（M25P32）和FPGA（上拉）的情况。第一次尝试没有在米索线上拉下。FX3在上电后读出4字节，然后出现USB回退。第二次尝试使用下拉电阻器（1，5KOHM）在MISO线路上。FX3读取大量字节，但它从不停止读取。看来FX3找不到具有正确校验和的固件文件。我已经尝试了工作在DVK板上的固件文件。但是我们自己的硬件上的固件文件不能工作。我们的硬件和FX3 DVK板之间的差别仅仅是MISO和MOSI连接到Flash和FPGA。问候



以下为原文
Hi, now I have new hardware and the SPI boot won't work. That is the case where the SPI MOSI and MISO lines are connected to SPI Flash (M25P32) and to FPGA (PULL UPS). First try was without a pull down at the MISO line. -> FX3 just read out 4 bytes after power up and then u*** fallback comes up. Second try with a pull down resistor (1,5kOhm) at the MISO line. -> FX3 is reading out lots of bytes but it never stops to read out. It seems that FX3 can not find a firmware file with correct checksum. I already tried the firmware file on the DVK board that works. But the same firmware file on our own hardware won't work. The difference between our hardware and the FX3 dvk board is just that MISO and MOSI are connected to flash and to FPGA. regards, lumpi

Lumpi
您可以启用FPGA SPI块一旦被下载到FX3固件。你可以使用一个GPIO作为一个中断的FPGA启动SPI模块。在SPI禁用模式下，行应该保持浮动，
谢谢，
马纳斯



以下为原文
Lumpi,

You can enable the SPI block of FPGA once the firmware gets downloaded into FX3. You can use a GPIO as an interrupt to the FPGA to start the SPI module. In SPI disable mode, the lines should be kept floating,

Thanks,
Manas

嗨，你没有理解我的问题，或者我还不够准确。我喜欢使用FX3:SPI的启动模式，后退是USB。因此，FX3 PMODE引脚配置为（SPI，如果失败，那么USB）。所以，当我在上一篇文章中描述这个问题时，我没有在FX3上运行的代码。问候



以下为原文
Hi, you have not understood my question or I was not exactly enough. I like to use the BOOT MODE of FX3: SPI, and fallback is USB. So FX3 PMODE Pins are configured to that (SPI, if fails then USB). So I have no code running on FX3 when the issue happens which I described in my last post. regards, lumpi