DCM外部反馈路径有什么问题？

嗨，
当我阅读xapp462时，我对反馈路径有疑问。
在图20中作为附件，反馈路径延迟必须与前向路径延迟匹配以保证歪斜消除
什么是前向路径延迟？
它意味着从E点到F点的daley？
根据我的理解，C，D是相位对齐的，因为它们是DCM的CLKIN和CLKFB
A，B早于C，D（IBUFG延迟），它们也是相位对齐的
该外部反馈结构的目标是消除FPGA输入时钟的偏移和外部器件的输入时钟，因此A，F对齐。
我的理解是对的吗？
如果正确，那意味着B，F是对齐的。
如何设计PCB板上从F到B的反馈路径延迟？
有人能帮助我吗？
谢谢

以上来自于谷歌翻译

以下为原文

Hi,
I have a question about the feedback path when I read xapp462.

In figure 20 as attachment, feedback path delay must match the forward path delay to guarentee skew elimination
what is the forward path delay? it means the daley from point E to F?

From my understanding, C,D are phase aligned because they are CLKIN and CLKFB of DCM
A,B are earlier than C,D (IBUFG delay) and they are phase aligned too
This external feedback structure's goal is remove the skew of the input clock of FPGA and the intput clock of external device, so A,F are aligned. Is my understanding right?

if right, that means B,F are aligned. How to design the feedback path delay on the PCB board from F to B?
Can somebody help me?
Thanks

张晓宁

2019-7-17 14:33:13

如果从E到F的延迟与从E到B的延迟匹配，则F将对齐（去偏斜）到A.
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以上来自于谷歌翻译

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If the delay from E to F matches the delay from E to B, then F will be aligned (de-skewed) to A.

-- Bob Elkind
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