[Arm-netbook] [EOMA68-A20] SATA testing

[Christopher]

Sent from my iPhone

On Sep 4, 2013, at 6:17 PM, "luke.leighton" <luke.leighton at gmail.com> wrote:

> On Thu, Sep 5, 2013 at 12:11 AM, joem <joem at martindale-electric.co.uk> wrote:
> 
>> you can balance the tracks by cutting both tracks and inserting the 0.1R resistor
> 
> i meant "are they the right length" - the answer's that the TX lines
> are 7ps out but the spec says that up to 30ps is ok.
> 
>> in each track and connect both resistors with scope probes to further balance it.
>> (A bit excessive me thinks for the kind of results you can extract from it.)
> 
> well... i'm thinking perhaps the capacitors should be replaced with
> 0R resistors temporarily (so that no board-level revisions are needed)
> and then the capacitors put onto the external I/O board, as near as
> possible to the SATA connector.


I have done exactly that, with no results. 


> 
> i think... i think i think.... i will go via maplin's tomorrow and
> get some 103 capacitors.  i've already removed one of the SATA
> connectors from one of the MEBs.
> 
> l.
> 
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