[Arm-netbook] HDMI High-Frequency Layout: Recommendations

Luke Kenneth Casson Leighton lkcl at lkcl.net
Thu Oct 12 01:04:21 BST 2017

crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

On Wed, Oct 11, 2017 at 5:58 PM, Richard Wilbur
<richard.wilbur at gmail.com> wrote:
> Your change to TX1 definitely looks like an improvement.
> In order to make a determination on the best course of action
> regarding the keepout at the connector end and whether to recommend
> some type of taper I still have a burning question:
> What does PADS currently give as the impedance of the HDMI
> differential lines?

 each line is 90 ohms.

>  Does it give an impedance for a particular trace?

 yes.  90 ohms.  or... 89.

>  (That would likely be the single-ended impedance.)  Does it offer a
> differential impedance value for a pair of traces?

 no.  from what i gather you're expected to read up on diff-pair rules.


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