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我目前正在使用IBERT 7系列GTP v3.0 r15测试Artix 7 FPGA(xc7a50tcsg325-2)的GTP收发器,我对结果感到非常困惑。
在此特定测试中,收发器未连接(打开)并配置为6.25Gbps,MGTREFCLK1上的125MHz时钟,我正在查看近端环回结果: 请注意,在这两个测试之间唯一的选项是环回模式,我在两种情况下都重置了发送器和接收器。 从UG482第2章环回部分(特别是图2-22环回测试概述)我得出结论,当近端PMA没有显示错误时,近端PCS环回应该没问题,如果近端PMA失败则近端PMA应该失败 近端PCS有错误,但显然结论是错误的...... 我在这里想念的是什么? 问题是什么? 提前致谢, 赫伯特 --------------是的,我这样做是为了好玩! 以上来自于谷歌翻译 以下为原文 I'm currently testing the GTP tranceivers of an Artix 7 FPGA (xc7a50tcsg325-2) with IBERT 7 Series GTP v3.0 r15 and I'm very confused by the results. In this specific test, the tranceivers are not connected (open) and configured to 6.25Gbps with a 125MHz clock on MGTREFCLK1 and I'm looking at the Near-End Loopback results: Note that the only option changed between those two tests is the loopback mode and that I did reset the transmitter and receiver in both cases. From UG482, chapter 2, section Loopback (specifically Figure 2-22 Loopback Testing Overview) I would conclude that the Near-End PCS loopback should be fine when the Near-End PMA shows no errors and the Near-End PMA should fail if the Near-End PCS has errors, but obviously that conclusion is wrong ... What am I missing here? What is the problem? Thanks in advance, Herbert -------------- Yes, I do this for fun! |
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4个回答
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H,
线路(模拟侧)环回很难做到,并保持信号完整性。 因此,近端环回通常需要删除连接到传输的任何内容,因为这可能会导致问题。 这就是为什么逻辑环回通常用于验证GT的逻辑是否正常,然后在线路上使用环回插头来验证物理模拟线路层。 可能还有其他打嗝: https://www.xilinx.com/support/answers/53107.html Austin Lesea主要工程师Xilinx San Jose 以上来自于谷歌翻译 以下为原文 h, Line (analog side) loopbacks are tough to do and keep the signal integrity perfect. So, a near end loopback often requires you remove anything attached to the transmit as that can cause problems. That is why the logic loopback is often used to verify the logic to/from the GT is OK, followed by using a loopback plug on the line to verify the physical analog line layer. There may be other hiccups as well: https://www.xilinx.com/support/answers/53107.html Austin Lesea Principal Engineer Xilinx San Jose |
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