Re: [casper] 10 GbE SPF+ to 1 GbE RJ45 adapter

2017-08-10 Thread Ryan Monroe 
I have not attempted the tutorial, but if I was testing the adapters, I 
would do something like this:


1. Take a known-working demo (which does loopback, for example)
2. Test the demo yourself and confirm it is doing loopback successfully
3. Disconnect the TX port from the ROACH and plug in your converter. 
   Connect to your pc via 1gbe and use wireshark to see if packets are

   coming through.
1. If this works, then you know that the connector works and your
   code is broken -- knowing what I do about writing 10GbE code,
   it's probably that!!
4. Now, test your own code with the device


I have used 1GbE and the interface is almost identical to the 10GbE 
interface.  Only difference is that you fill the interface one byte at a 
time.  So, toss an 8-mux in front of the input, driving each of the mux 
inputs with a different one-byte slice of the 8-byte 10GbE input word.  
Attach a 3-bit counter to the "select" port, and you're off to the races!



I strongly suggest starting off by connecting a simple constant or 
counter to your input at first.  Change it to something more 
sophisticated once you get your endianness and basic packet reading 
sorted out.



On 08/10/2017 01:32 PM, Xavier Bosch wrote:

Ryan,
Thank you for your response.
You are right, I first considered the 1 GbE port but this implies to 
restructure the data packaging, instead of using 64 bits of length, as 
I am right now. I have to change it to 8.
Besides the fact that there is no much information on the 1 GbE port, 
but there is a tutorial for teh 10 GbE, which made it quite easy to 
implement it.
Is not that it cannot be done, but design and test would take me a 
significant amount of time.

If I could solve the problem using an adapter that would be great !  :-)

XB


On Thu, Aug 10, 2017 at 1:22 PM Ryan Monroe > wrote:


Why not use the 1GbE port on the ROACH2?  No need to go for 10GbE
(SFP+) ports


On 08/10/2017 01:16 PM, Xavier Bosch wrote:

Hi,

As I explained in a previous email, I am looking for a way to
send the slow-throughput ROACH2 data  (~25 Mbps) to a PC without
using the SPF+ ports on the PC side.  Mobility is important for
the project that I am working, so I want to be able to use any
laptop for that purpose without the burden of having to have a 10
GeB SPF+ card

I first considered the 1 GbE but this implies a big
reconfiguration of the design sine the outputs are 8 bit instead
of 64 that the 10 GbE interface uses.

Have anyone tried to use a SPF+ to 1 GbE RJ45 connector like the
ones in the attached picture?

I did some research and I found that the Quad SFP+ Mezzanine
board uses the Vitesse VSC8488XJU chip which in theory should
allow such connection, as you can see in this spec. sheet
http://www.mouser.com/ds/2/523/microsemi_VSC8489-01_PB-883836.pdf

So far, I tested 2 different adapters at port 0 with no luck.
Does anyone know if this is possible?
Is the 1 GbE option enable in the mezzanine board?

Thank you,
XB
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California Institute of Technology
Cahill 255 |626.773.0805 



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Re: [casper] 10 GbE SPF+ to 1 GbE RJ45 adapter

2017-08-10 Thread Jack Hickish 
Hi Xavier,

Using an adapter might be possible in principle, but it definitely won't
work out the box. It's probably about three orders of magnitude more design
effort to get this working vs using the on-board 1gbe :)

Sorry!
Jack

On Thu, Aug 10, 2017, 1:33 PM Xavier Bosch 
wrote:

> Ryan,
> Thank you for your response.
> You are right, I first considered the 1 GbE port but this implies to
> restructure the data packaging, instead of using 64 bits of length, as I am
> right now. I have to change it to 8.
> Besides the fact that there is no much information on the 1 GbE port, but
> there is a tutorial for teh 10 GbE, which made it quite easy to implement
> it.
> Is not that it cannot be done, but design and test would take me a
> significant amount of time.
> If I could solve the problem using an adapter that would be great !  :-)
>
> XB
>
> On Thu, Aug 10, 2017 at 1:22 PM Ryan Monroe 
> wrote:
>
>> Why not use the 1GbE port on the ROACH2?  No need to go for 10GbE (SFP+)
>> ports
>>
>> On 08/10/2017 01:16 PM, Xavier Bosch wrote:
>>
>> Hi,
>>
>> As I explained in a previous email, I am looking for a way to send the
>> slow-throughput ROACH2 data  (~25 Mbps) to a PC without using the SPF+
>> ports on the PC side.  Mobility is important for the project that I am
>> working, so I want to be able to use any laptop for that purpose without
>> the burden of having to have a 10 GeB SPF+ card
>>
>> I first considered the 1 GbE but this implies a big reconfiguration of
>> the design sine the outputs are 8 bit instead of 64 that the 10 GbE
>> interface uses.
>>
>> Have anyone tried to use a SPF+ to 1 GbE RJ45 connector like the ones in
>> the attached picture?
>>
>> I did some research and I found that the Quad SFP+ Mezzanine board uses
>> the Vitesse VSC8488XJU chip which in theory should allow such
>> connection, as you can see in this spec. sheet
>> http://www.mouser.com/ds/2/523/microsemi_VSC8489-01_PB-883836.pdf
>>
>> So far, I tested 2 different adapters at port 0 with no luck.
>> Does anyone know if this is possible?
>> Is the 1 GbE option enable in the mezzanine board?
>>
>> Thank you,
>> XB
>> --
>> You received this message because you are subscribed to the Google Groups
>> "casper@lists.berkeley.edu"  group.
>> To unsubscribe from this group and stop receiving emails from it, send an
>> email to casper+unsubscr...@lists.berkeley.edu.
>> To post to this group, send email to casper@lists.berkeley.edu.
>>
>>
>> --
>>
>> Ryan Monroe
>> PhD Student | Electrical Engineering
>> California Institute of Technology
>> Cahill 255 | 626.773.0805 <(626)%20773-0805>
>>
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Re: [casper] 10 GbE SPF+ to 1 GbE RJ45 adapter

2017-08-10 Thread Xavier Bosch 
Ryan,
Thank you for your response.
You are right, I first considered the 1 GbE port but this implies to
restructure the data packaging, instead of using 64 bits of length, as I am
right now. I have to change it to 8.
Besides the fact that there is no much information on the 1 GbE port, but
there is a tutorial for teh 10 GbE, which made it quite easy to implement
it.
Is not that it cannot be done, but design and test would take me a
significant amount of time.
If I could solve the problem using an adapter that would be great !  :-)

XB


On Thu, Aug 10, 2017 at 1:22 PM Ryan Monroe  wrote:

> Why not use the 1GbE port on the ROACH2?  No need to go for 10GbE (SFP+)
> ports
>
> On 08/10/2017 01:16 PM, Xavier Bosch wrote:
>
> Hi,
>
> As I explained in a previous email, I am looking for a way to send the
> slow-throughput ROACH2 data  (~25 Mbps) to a PC without using the SPF+
> ports on the PC side.  Mobility is important for the project that I am
> working, so I want to be able to use any laptop for that purpose without
> the burden of having to have a 10 GeB SPF+ card
>
> I first considered the 1 GbE but this implies a big reconfiguration of the
> design sine the outputs are 8 bit instead of 64 that the 10 GbE interface
> uses.
>
> Have anyone tried to use a SPF+ to 1 GbE RJ45 connector like the ones in
> the attached picture?
>
> I did some research and I found that the Quad SFP+ Mezzanine board uses
> the Vitesse VSC8488XJU chip which in theory should allow such connection,
> as you can see in this spec. sheet
> http://www.mouser.com/ds/2/523/microsemi_VSC8489-01_PB-883836.pdf
>
> So far, I tested 2 different adapters at port 0 with no luck.
> Does anyone know if this is possible?
> Is the 1 GbE option enable in the mezzanine board?
>
> Thank you,
> XB
> --
> You received this message because you are subscribed to the Google Groups
> "casper@lists.berkeley.edu"  group.
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> email to casper+unsubscr...@lists.berkeley.edu.
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>
>
> --
>
> Ryan Monroe
> PhD Student | Electrical Engineering
> California Institute of Technology
> Cahill 255 | 626.773.0805 <(626)%20773-0805>
>
>

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Re: [casper] 10 GbE SPF+ to 1 GbE RJ45 adapter

2017-08-10 Thread Ryan Monroe 
Why not use the 1GbE port on the ROACH2?  No need to go for 10GbE (SFP+) 
ports



On 08/10/2017 01:16 PM, Xavier Bosch wrote:

Hi,

As I explained in a previous email, I am looking for a way to send the 
slow-throughput ROACH2 data  (~25 Mbps) to a PC without using the SPF+ 
ports on the PC side.  Mobility is important for the project that I am 
working, so I want to be able to use any laptop for that purpose 
without the burden of having to have a 10 GeB SPF+ card


I first considered the 1 GbE but this implies a big reconfiguration of 
the design sine the outputs are 8 bit instead of 64 that the 10 GbE 
interface uses.


Have anyone tried to use a SPF+ to 1 GbE RJ45 connector like the ones 
in the attached picture?


I did some research and I found that the Quad SFP+ Mezzanine board 
uses the Vitesse VSC8488XJU chip which in theory should allow such 
connection, as you can see in this spec. sheet 
http://www.mouser.com/ds/2/523/microsemi_VSC8489-01_PB-883836.pdf


So far, I tested 2 different adapters at port 0 with no luck.
Does anyone know if this is possible?
Is the 1 GbE option enable in the mezzanine board?

Thank you,
XB
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Ryan Monroe
PhD Student | Electrical Engineering
California Institute of Technology
Cahill 255 | 626.773.0805

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