Odd traces on SODIMM

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6 years 3 weeks ago #2799 by Stuckey
I took these photos of this 2GB SODIMM from my laptop and I noticed some odd traces. What is the point of this elaborate snaking when he rest of the board has clean, short path traces?





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6 years 3 weeks ago #2807 by Stuckey
And we have an answer. From Dave Jones of EEVBLOG:

"It matches the trace length to the one next to it. For timing. RT @brianstuckey: what is the point of curvy tracks? bit.ly/u8zUX5"

"If the laws of physics don't apply in the future, then god help you."
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6 years 3 weeks ago #2811 by bcoggs
Yup SDRAM has very tight timing. Trace length can factor in. So every data line and address line needs to be of near equal length. It isn' really an issue until the entire trace reaches multiple inches, like on a PC motherboard.
..c

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