[问答]

spartan-3E FAMILY出现故障

1425 FPGA

问答对人有帮助，内容完整，我也想知道答案 0 嗨，大家好我有一个关于spartan-3E FAMILY INTERFACE WITH XCFxxProm的问题。选择的模式： MAster Serial模式，M =，问题：假设FPGA从附加的PROM配置自己。这真的适用于我们的项目，但有一次我们成功配置，当我们开机时10次！主要嫌疑人：在fpga清除其内存后，它会将CCLK发送给Prom。然后将一个名为INIT_B的标志置为HIGH。当配置中出现故障时，此标志会变高。我阅读了有关CCLK引脚的设计考虑因素。我读到我们不想从那个引脚留下长长的痕迹。问题是： 1-长是一个实际的距离，有人知道这是多长的厘米？ 2-有没有人面临同样的问题，他还有其他原因吗？提前致谢以上来自于谷歌翻译以下为原文 Hi everyone I have a question about spartan-3E FAMILY INTERFACE WITH XCFxxProm. Mode selected : MAster Serial mode ,M<2:0>=<000>,Problem: It is supposed that the fpga configures itself from the attached PROM. That really works with our project, but 1 time we have successful configuration each 10 times when we power on !The main suspect : After the fpga clears its memory it sends out the CCLK to the Prom. Then a flag called INIT_B is raised HIGH. This flag nevers goes high when there is faliure in configuration. I read the design consideration about the CCLK pin. I read that we have not to make long traces out of that pin.The question: 1- Long is a realtive distance, Do anyone know howlong is that in centimeters ? 2- Did anyone face the same problem and he have another reason for that ? Thanks in advance 0
2018-9-29 14:36:56　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × asd008 该类别下有 32 个回答。邀请回答 aaaa321 该类别下有 27 个回答。邀请回答 doublelove 该类别下有 26 个回答。邀请回答 vynywrwr 该类别下有 21 个回答。邀请回答 hgjhgd 该类别下有 19 个回答。邀请回答 bwerwer 该类别下有 18 个回答。邀请回答 hanyan533 该类别下有 18 个回答。邀请回答 Jaionm 该类别下有 18 个回答。邀请回答 wang2222222 该类别下有 17 个回答。邀请回答 handsomelchcpp 该类别下有 17 个回答。邀请回答 binro 该类别下有 16 个回答。邀请回答 ningee 该类别下有 16 个回答。邀请回答 myf888 该类别下有 15 个回答。邀请回答 wznnzw 该类别下有 15 个回答。邀请回答 zcy615 该类别下有 14 个回答。邀请回答 wanglinhua2627 该类别下有 14 个回答。邀请回答 guotong1984 该类别下有 14 个回答。邀请回答 yhxc 该类别下有 14 个回答。邀请回答 armortech 该类别下有 14 个回答。邀请回答 60user25 该类别下有 14 个回答。邀请回答举报毕凯相关推荐 • 为什么Spartan-3E系列不支持DDR2接口？ 1234 • 请问在SPARTAN-3E套件中的PROM版本分区有什么规则？ 1007 • 如何在Spartan-3E套件中构建代码 1011 • 如何将外部ADC（ADS7883）连接到spartan-3E？ 1840 • 求转让Spartan-3E Starter Kit 实验板 1620 • 请问我是否可以将天线连接到我的spartan-3e板并从中发送信号？ 1018 • Spartan 3e的FIFO的最高性能时钟频率 1336 • SPARTAN 3系列及其他系列的必备信息 1185 • 如何在带有BPI模式的spartan-3E上使用NOR闪存？ 1605 • 如何使用Spartan-3E FPGA为引脚设置VIL和VIH？ 1424 1个回答

答案对人有帮助，有参考价值 0 你应该仔细看看INIT_B。如果它真的永远不会高，然后我不会怀疑CCLK，因为这表明了 FPGA不会退出正常的上电复位状态。但是如果 INIT_B短暂地再次变高，然后再次变低，你可能会遇到问题 CCLK。这表示配置负载中存在CRC错误。 CCLK上的长行可能会导致振铃，而Spartan3系列则会出现振铃当它用作输入时，该引脚易于振铃。在你的情况下（主串行模式）CCLK是一个输出，所以信号应在闪存芯片（XFFxxS或XCFxxP）上检查质量。通常这些部件不易受到多次计时的影响比Spartan3响。如果配置失败时INIT_B线确实保持低电平，我会的建议看看你的电源开启特性。一个可能的问题可能是非单调电压上升（电压变高当斯巴达开始出现负荷时，然后下降。如果如果配置正确，您的系统运行良好，您可能会能够通过添加外部来解决启动问题上电复位电路将PROG_B驱动为低电平，直到电源为止稳定。 HTH，的Gabor - Gabor 以上来自于谷歌翻译以下为原文 You should look carefully at INIT_B. If it really never goeshigh, then I would not suspect CCLK, because this indicates that theFPGA doesn't exit its normal power-on reset state. However ifINIT_B goes high briefly and then low again, you may have issues withCCLK. This would indicate a CRC error in the configuration load. Long lines on CCLK can result in ringing, and the Spartan3 series aresusceptible to ringing on this pin when it is used as an input. In your case (master serial mode) CCLK is an output, so the signalquality should be checked at the Flash chip (XFFxxS or XCFxxP). Normally these parts are less susceptible to multiple clocking due toringing than the Spartan3. If the INIT_B line really stays low when configuration fails, I wouldsuggest looking at your power-supply turn-on characteristics. Apossible problem might be non-monotonic voltage rise (the voltage goesup and then dips when the Spartan starts to present a load). Ifyour system runs well when it does configure correctly, you might beable to work around the start-up issue by adding an externalpower-on-reset circuit to drive PROG_B low until the supplies arestable. HTH, Gabor -- Gabor

2018-9-29 14:54:33 评论举报杨玲