[SI-LIST] Fw: Re: SATA intra pair flipping
- From: Joseph.Schachner@xxxxxxxxxx
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 29 Jan 2010 10:36:29 -0500
You're correct that SATA does not support polarity flip (at least, the spec
doesn't require it). But there is at least one counterexample to the logic
that there isn't "perceived market need to handle PCB design errors" - PCI
Express does support polarity reversal. It's one of the "services" of the
Physical Layer, listed in section 1.5.4.3 (of PCI EXPRESS BASE
SPECIFICATION, REV. 2.1).
--- Joe S.
From: steve weir <weirsi@xxxxxxxxxx>
To: "Lenkisch, Andreas" <Andreas.Lenkisch@xxxxxxxxxxx>
Cc: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
Date: 01/29/2010 04:32 AM
Subject: [SI-LIST] Re: SATA intra pair flipping
Sent by: si-list-bounce@xxxxxxxxxxxxx
I think you are out of luck. SATA isn't subject to human installers
punching down connections backwards like Ethernet is. I doubt there is
any perceived market need to handle PCB design errors. I am pretty sure
that polarity sensing / flipping is not available on SiliconImage
parts. I doubt it is available on anyone else's.
Steve.
Lenkisch, Andreas wrote:
> 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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--
Steve Weir
IPBLOX, LLC
150 N. Center St. #211
Reno, NV 89501
www.ipblox.com
(775) 299-4236 Business
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