[SI-LIST] Re: Fw: Re: SATA intra pair flipping
- From: Scott McMorrow <scott@xxxxxxxxxxxxx>
- To: Joseph.Schachner@xxxxxxxxxx
- Date: Fri, 29 Jan 2010 10:49:12 -0500
Joe
PCI Express polarity reversal was not designed to meet the need of PCB
design errors, it was designed to facilitate package pin assignment,
routing, and de-skew simplification.
Joseph.Schachner@xxxxxxxxxx wrote:
> 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
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--
Scott McMorrow
Teraspeed Consulting Group LLC
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