rocketio

Hi,
I would like some help from roketio users to find what is the maximum 
realizable freq we can get out of it. I hear that although it supports upto 
3.125Ghz, you can only get only upto 2.5Ghz. Also, can I get any eval board 
which has charaterized the performance. Thanks much

Thomas

news.verizon.net wrote:
> Hi,
> I would like some help from roketio users to find what is the maximum 
> realizable freq we can get out of it. I hear that although it supports upto 
> 3.125Ghz, you can only get only upto 2.5Ghz. Also, can I get any eval board 
> which has charaterized the performance. Thanks much
> 
> Thomas
> 
> 

The RocketIO MGTs in the Virtex-II Pro family have a bandwidth up to
3.125 Gbps (not GHz) using the -6 and -7 speed grades and
flipchip (FF) packages. The slower -5 speed grade is rated for
2.000 Gbps and the wirebond (FG) packages are rated for 2.50 Gbps.

Our Virtex-II Pro X and Virtex-4 families have higher bandwidth
RocketIO MGTs and can operate above 10 Gbps.

You can purchase the board (HW-V2P-ML321) that is used for RocketIO
characterization through any Xilinx distributor or through our
online store at  http://www.xilinx.com/ml321/  in addition to the
ML321 with a XC2VP7-FF672-6C device we also sell the HW-V2P-ML323
with a XC2VP50-FF1152-6C device and the HW-V2P-ML325 with a
XC2VP70-FF1704-6C device, both of which can also be found in our
online store.

Ed

Ed McGettigan <ed.mcgettigan@xilinx.com> wrote:
> Our Virtex-II Pro X and Virtex-4 families have higher bandwidth
> RocketIO MGTs and can operate above 10 Gbps.
> 

Virtex 4 can do up to 11.1Gb/s to be exact.

-- 

Wing Wong.

"news.verizon.net" <res0rsef@verizon.net> schrieb im Newsbeitrag
news:DZK_d.4272$uw6.817@trnddc06...
> Hi,
> I would like some help from roketio users to find what is the maximum
> realizable freq we can get out of it. I hear that although it supports
upto
> 3.125Ghz, you can only get only upto 2.5Ghz. Also, can I get any eval
board

3.125 Gbit/s, not GHz. This is the line data rate. Effective data rate is
only 2.5 Gbits/s due to line encoding using 8B/10B encoder (encodes 8 data
bits into 10 data bits to guarantee a constant DC level and transition
density) Virtex4 supports also 64B/66B encoding (which is much more
effcient).

Regards
Falk

Falk,

You could decide to scramble the data and not use 8B10B, but then you 
would have to be sure your scrambling never violated run length, or DC 
imbalance issues, and you could live with scrambling multiplying a 
single error into to more than one.

That way you could actually get 3.125 Gbs in V2 Pro, or 10 Gb/s in V2 
Pro-X, or 10 Gbs in V4.

Austin

Falk Brunner wrote:

> "news.verizon.net" <res0rsef@verizon.net> schrieb im Newsbeitrag
> news:DZK_d.4272$uw6.817@trnddc06...
> 
>>Hi,
>>I would like some help from roketio users to find what is the maximum
>>realizable freq we can get out of it. I hear that although it supports
> 
> upto
> 
>>3.125Ghz, you can only get only upto 2.5Ghz. Also, can I get any eval
> 
> board
> 
> 3.125 Gbit/s, not GHz. This is the line data rate. Effective data rate is
> only 2.5 Gbits/s due to line encoding using 8B/10B encoder (encodes 8 data
> bits into 10 data bits to guarantee a constant DC level and transition
> density) Virtex4 supports also 64B/66B encoding (which is much more
> effcient).
> 
> Regards
> Falk
> 
> 
> 

"austin" <austin@xilinx.com> schrieb im Newsbeitrag
news:d1hqit$ka91@cliff.xsj.xilinx.com...
> Falk,
>
> You could decide to scramble the data and not use 8B10B, but then you
> would have to be sure your scrambling never violated run length, or DC
> imbalance issues, and you could live with scrambling multiplying a
> single error into to more than one.

Hmmm, since scrambling works reasonable well (all long distance traffic on
fiber optics is SONET/SDH) so it is a good option. But maybe a soft 64B/66B
encoder (V2P) let you sleep much more relaxed and so its worth the silicone.

Regards
Falk

Thanks for all the response. There is a very good app note(xapp681) from 
xilinx by John Snow bypassing MGT 8B/10B used as HD Receiver. Source code 
included.
Thomas


"Falk Brunner" <Falk.Brunner@gmx.de> wrote in message 
news:3a3h36F67qf7aU1@individual.net...
>
> "austin" <austin@xilinx.com> schrieb im Newsbeitrag
> news:d1hqit$ka91@cliff.xsj.xilinx.com...
>> Falk,
>>
>> You could decide to scramble the data and not use 8B10B, but then you
>> would have to be sure your scrambling never violated run length, or DC
>> imbalance issues, and you could live with scrambling multiplying a
>> single error into to more than one.
>
> Hmmm, since scrambling works reasonable well (all long distance traffic on
> fiber optics is SONET/SDH) so it is a good option. But maybe a soft 
> 64B/66B
> encoder (V2P) let you sleep much more relaxed and so its worth the 
> silicone.
>
> Regards
> Falk
>
>
> 

Falk,

I agree.  Making your own link format, data protocol, etc. is a big 
project.  Best to use a standard.

Also, don't use silicone.

Austin

Are you sure about that 11 Gbps figure?

I've just had a look to the latest 'ug' from Xilinx 
http://direct.xilinx.com/bvdocs/userguides/ug076.pdf and still says it can 
run up to 10.3125 Gbps... so... a pity that they are missing OTU2 (10.709 
Gbps). This implies you still need an LIU between your optics and your V4 if 
you want to go up to OTU2, doh! It will support OC192... probably with the 
xpensive/fastest speed grade.

-- 
I.U. Hernandez
" I'm not normally a praying man, but if you're up there, please save me, 
Superman!" - Homer Simpson

"Wing Fong Wong" <wing@stu.edu.au> wrote in message 
news:d1gfc4$nap$1@enyo.uwa.edu.au...
> Ed McGettigan <ed.mcgettigan@xilinx.com> wrote:
>> Our Virtex-II Pro X and Virtex-4 families have higher bandwidth
>> RocketIO MGTs and can operate above 10 Gbps.
>>
>
> Virtex 4 can do up to 11.1Gb/s to be exact.
>
> -- 
>
> Wing Wong. 

I. Ulises Hernandez <delete@e-vhdl.com> wrote:
> Are you sure about that 11 Gbps figure?
> 
> 

11.1 was quoted at a xilinx conference I was attending last week.

-- 

Wing Wong.