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你好，
它似乎有一些限制在FX3内部时钟。例如，在某些情况下，如果我们减少内部时钟，就会提到DMA溢出。这里的主要问题是我们希望降低FX3的功耗（每个MA计数！）对于这个特殊的设计，我们只在USB 2中操作。有人有一些关于FX3内部时钟安全设置的经验吗？（CPU，DMA时钟？） 谢谢， 丹尼斯。 以上来自于百度翻译 以下为原文 Hi, It seems to have some restrictions around the FX3 internal clocks. For example, there is a mention about DMA overflow in some cases if we decrease the internals clocks. The main problem here is we want to decrease the power consumption of the FX3 (each mA counts!). For this particular design, we will operate only in USB 2.0. Does anybody has some experience about safe settings for internal clocks of the FX3? (CPU, DMA clocks?) Thanks, Denis. 
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你好，
大多数时钟来自系统时钟“CyuU3PySysILCK”。如果要降低特定块的时钟频率，则必须增加该特定块的时钟分割因子。请注意，如果您为特定的块减慢时钟，它的性能将被降低，因此在执行此操作时必须小心。如果您降低了UBPHY时钟频率低于某个值，那么您的设备可能会面临USB遵从性问题。你能描述一下你的应用程序和你使用的固件例子吗？ 感谢和问候 阿比纳夫 以上来自于百度翻译 以下为原文 Hi, Most clocks are derived from the system clock "CY_U3P_SYS_CLK". If you want to decrease the clock frequency of a particular block, you have to increase the clock division factor for that particular block. Please note that if you slow down the clock for a particular block, its performance will be degraded hence you have to be careful while doing this. If you decrease the clock frequency for USBPHY below a certain value then your device may face USB compliance issue. Could you please describe about your application and which firmware example you are using? Thanks & Regards Abhinav |
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ldliu 发表于 2018-9-5 14:40 嗨，Abhinav， 我们想用同一个PCB作为另一个USB 3产品，但正如我所说，这个只会在USB 2上工作。我们将做大约50Mb/s MAX的小容量的ISO传输。现在，我们需要节省约20mA总低于500毫安的USB 2限制。 我们试图玩除法器，但正如你前面提到的，该设备停止工作与许多不同的设置。我期待从柏树的一些指导方针，以了解我们的应用程序的每一个时钟的确切限制（USB 2的总传输小于15%总BW）。 你有更多的分享价值吗？ 谢谢， Denis Alain，Eng. 以上来自于百度翻译 以下为原文 Hi Abhinav, We want to use the same PCB as another USB 3.0 product, but as I said, this one will work only on USB 2.0. We will do bulk transferts of about 50Mb/s max with small ISO transferts also. Right now, we need to save about 20mA total to be below the 500mA limit of USB 2.0. We tried to play with dividers, but as you mentioned previously, the device stopped to work with many different settings. I was expecting some guidelines from Cypress to know the exact limits of each clock with our application (USB 2.0 with bulk transfert of less than 15% total BW). Do you have more precises values to share? Thanks, Denis Alain, Eng. |
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wxsmjyl 发表于 2018-9-5 14:54 嗨，丹尼斯， 我们已经观察了FX3甚至不能用USB3.0吸引超过500毫安。你能说什么所有的设备都连接在Fx3外围。一个建议是你可以停在Fx3你不那些块使用。同时柏不提供任何精确限每个时钟是根据不同的应用，你要做的命中和试验得到的时钟频率的最小值。 感谢和问候 阿比纳夫 以上来自于百度翻译 以下为原文 Hi Denis, We had observed that FX3 can't draw more than 500 mA even with USB 3.0. Could you please mention what all devices are connected in the peripheral of FX3. One suggestion is you can shutdown those blocks in FX3 which you are not using. Also cypress doesn't provide any exact limits of each clock as it varies according to application, you have to do hit and trial to get the minimum value of clock frequency. Thanks & Regards Abhinav |
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ldliu 发表于 2018-9-5 15:00 嗨，Abhinav， 不幸的是，我不能分享我们的产品在论坛上的确切框图。这是机密信息。GPIF工作在31兆赫，以节省电力。不使用SPI，在100kHz使用I2C。这是我可以分享的信息。500毫安的限制是一个问题，因为完整的解决方案（FX3单独不是问题）。 因为它是试错的事情，我们不会玩FX3的内部时钟来避免问题。我希望得到一些指导，但我知道你没有这些数字。由于这个原因，我认为我们可以考虑这个线程关闭。 感谢和问候， 丹尼斯。 以上来自于百度翻译 以下为原文 Hi Abhinav, Unfortunately, I cannot share the exact block diagram of our product on the forum. This is confidential information. The GPIF is working at 31MHz to save power. The SPI is not used and the I2C is used at 100kHz. This is the information I can share. The limit of 500mA is a problem because of the complete solution (the Fx3 alone is not the problem). Since it is trial and error things, we won't play with the internal clocks of the FX3 to avoid problems. I would expect some guidelines, but I understand that you didn't have these numbers. For this reason, I think we can consider this thread closed. Thanks & Best Regards, Denis. |
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