[SI-LIST] Re: SATA intra pair flipping
- From: "Marc Humphreys" <mhumphreys@xxxxxxxxxxxxxxxxxxx>
- To: "Lenkisch, Andreas" <Andreas.Lenkisch@xxxxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 29 Jan 2010 07:15:43 -0800
Andreas,
I've worked on a bunch of SAS/SATA disk array projects, but I can't
remember off the top of my head whether it is supported or not, but you
might want to contact your local LSI resource or find a couple of their
datasheets.
Contrary to Steve's comment, in many large data storage products or
rackmount systems and blade servers uisng sas/sata drives never use any
cables but use hot swap trays that connect directly into a backplane, riser
cards or custom flex assemblies. Routing of course can always be a
challenge so, it seems logical that pin sense swapping may be an option.
However, that is only usefully if you have direct control of the controller
as I don't believe it would be an autosense capability. Disk side is not
configurable.
Marc
----------------------------------------
From: "Lenkisch, Andreas" <Andreas.Lenkisch@xxxxxxxxxxx>
Sent: Friday, January 29, 2010 4:14 AM
To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
Subject: [SI-LIST] SATA intra pair flipping
does anyone know if state of the art SAT controller can flip +/- pins of
the RX pair? (if +/- flipped erroneously along the path)
thanks in advance
Andreas
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Rama Mohan Reddy Boreddy
Sent: Freitag, 29. Januar 2010 05:12
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Silver ink usage in High Speed Flex Designs
Hi Experts,
In one of our earlier projects, we have used High Speed Flex PCBs. The
stackup of the 3 layer Flex is like this
Solder Mask
Silver Ink
FR4
Layer 1 ( HDMI, SATA and USB)
FR4
GND
FR4
Layer2 (HDMI, SATA )
FR4
Silver Ink
Solder mask
I haven't included adhesive for the clarity. Please share your thoughts
a) Does the Silver ink really required? Silver ink used to provide
shielding for top and bottom signal layer. But when i checked the
appliation notes, Silver Ink doesn't provide proper shielding at speed more
than 1 GHz.
Rama
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