[SI-LIST] Re: M.2 connector signal connectivity
- From: Hermann Ruckerbauer <Hermann.Ruckerbauer@xxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 19 Dec 2014 08:19:09 +0100
As far I understand the original e-mail RX and TX are exchanged in the
layout.
I don't expect too many silicon vendors to allow swapping RX and TX, as
one of the big advantages of unidirectional signaling is, that on the RX
side you have only the small capacitance of the Receiver and not the big
load of the driver. If the interface is Implemented as IO you are giving
up this advantage.
dependent on your layout it might be possible to do some wire warp
connection exchange .. for short distances and with drilled wires this
works surprisingly well also at higher speeds.
I would not do any compliance testing on this one, but from a
functionality point of view your might be able at least to confirm that
the system would work ..
Hermann
EKH - EyeKnowHow
Hermann Ruckerbauer
www.EyeKnowHow.de
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Am 18.12.2014 um 21:49 schrieb Krunal Desai:
> IIRC, the spec allows for an individual lanes P and N to be swapped. Whether
> you can entirely swap Rx and Tx depends on the silicon vendor. I recall PLX
> parts being very flexible in this regard.
>
> --khd (mobile)
>
>> On Dec 18, 2014, at 15:41, Boris Bakshan <bbakshan@xxxxxxxxx> wrote:
>>
>> Hi,
>> What do you mean by "to be swapped" ? for M.2, PCIe pin-out is always
>> relative to the host.
>> Please explain what exactly you're referring to.
>>
>>
>> On Thu, Dec 18, 2014 at 10:14 AM, Lakshmi Narayanan Sowrirajan, ERS-HCLTech
>> <lakshminarayanans@xxxxxxx> wrote:
>>> Hi All,
>>>
>>> I am using M.2 connector in my design with PCI interface.
>>> Whether the Tx to Rx has to be swapped in the connector or it is taken
>>> care in the M.2 module.
>>>
>>> Please confirm as I am stuck with my testing, where the swapping is done
>>> at the connector in my design.
>>>
>>> In case if the design I have is wrong is there any option to overcome this?
>>>
>>> Thanks for your clarification.
>>>
>>> Regards
>>> SLN
>>>
>>>
>>>
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