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gongmh's avatar
gongmh
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2 years ago

The question about arria10-netlength

hello, I downloaded this table(10AS032EF29_netlength.xlsx) from the official website, but there are two columns in it: Total Length (mm) and Total Delay (ps). Which data should I take as the criteri...
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AqidAyman_Altera's avatar
AqidAyman_Altera
Icon for Regular Contributor rankRegular Contributor
2 years ago

Hello,


May I know why you think it supposed to be a fix ratio?


Regards,

Aqid


gongmh's avatar
gongmh
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2 years ago

Hello，

first, I think the ratio of length to time represents the rate, it's a constant value.

second,The purpose of equilength is isochronous. The length should equal the length of the delay.（1mm=39.72mil ， in FR4 PCB, 1ps≈6mil ）

If they're not equal, it's a proportional relationship. I don't know if I understand this right?

Regards,

gongmh