Can I use RocketIO to generate pulse edge with very high pre

[David]

Hi,
I need to generate a 1-bit signal with very high resolution on the
position of the edges. I would need about 2 to 3GHz resolution. It is
quite hard to have a 3Ghz clock nowadays, so I wonder if the RockedIO
could be used for that.

Thanks,
Dave

 

[Peter Alfke]

You can use RocketIO.
In Virtex-IIPro it can handle 3.125 Gbps, which means a ~320 ps bit time.
Just run the MGT with a 156.25 MHz Fref, and apply the appropriate data
pattern on the parallel ( 10 or 20-bit) side.
In Virtex-IIProX you can go more than 3 times faster...
Peter Alfke

From: gretzteam@hotmail.com (David)
Organization: http://groups.google.com
Newsgroups: comp.arch.fpga
Date: 3 Aug 2004 14:11:48 -0700
Subject: Can I use RocketIO to generate pulse edge with very high precision?

Hi,
I need to generate a 1-bit signal with very high resolution on the
position of the edges. I would need about 2 to 3GHz resolution. It is
quite hard to have a 3Ghz clock nowadays, so I wonder if the RockedIO
could be used for that.

Thanks,
Dave

 

[David]

Hi,
thanks for the reply, this looks very interesting. I didn't know you
could control all the bits going out of the rocketIO, I thought it was
made to generate some specific serial protocol pattern. Does Xilinx
have an eval board for that? I really like the xilinx type of eval.
board, such as the ones for virtexIIpro:
http://www.xilinx.com/xlnx/xebiz/board_detail.jsp?=&category=-21482&iLanguageID=1&key=HW-AFX-FF1152-300
They are really simple with the prototype area easiliy accessible.
However, they say: ''The AFX board should NOT be used when designing
with or characterizing RocketIO™ transceivers''

I could only find something here:
http://www.insight.na.memec.com/Memec/iplanet/link1/VirtexIIPro_FF1152_2.pdf

....but it doesn't look too appealing to me.

Regards,
David

Peter Alfke <peter@xilinx.com> wrote in message news:<BD354F7F.7D3D%peter@xilinx.com>...

You can use RocketIO.
In Virtex-IIPro it can handle 3.125 Gbps, which means a ~320 ps bit time.
Just run the MGT with a 156.25 MHz Fref, and apply the appropriate data
pattern on the parallel ( 10 or 20-bit) side.
In Virtex-IIProX you can go more than 3 times faster...
Peter Alfke

From: gretzteam@hotmail.com (David)
Organization: http://groups.google.com
Newsgroups: comp.arch.fpga
Date: 3 Aug 2004 14:11:48 -0700
Subject: Can I use RocketIO to generate pulse edge with very high precision?

Hi,
I need to generate a 1-bit signal with very high resolution on the
position of the edges. I would need about 2 to 3GHz resolution. It is
quite hard to have a 3Ghz clock nowadays, so I wonder if the RockedIO
could be used for that.

Thanks,
Dave

 

[Austin Lesea]

David,

The reason for the disclaimer is that some of these ML series boards are
intended to show off other features, and we did not follow our own rules
when bypassing, routing, and in general, supporting the MGT signals as
the board wasn't intended for that purpose.

The MGT works, and the board would be useful for what you want, as all
you care about here is generating an output!

Getting an error free channel at 3.125 Gbs over the longest XAUI
backplane is definitely not supported by those boards that state so, but
for basic MGT operation, they work just fine.

If you bypass the 8B10B codec, then you are responsible for all the
bits, which is very nice to do what you want.

Austin

David wrote:

Hi,
thanks for the reply, this looks very interesting. I didn't know you
could control all the bits going out of the rocketIO, I thought it was
made to generate some specific serial protocol pattern. Does Xilinx
have an eval board for that? I really like the xilinx type of eval.
board, such as the ones for virtexIIpro:
http://www.xilinx.com/xlnx/xebiz/board_detail.jsp?=&category=-21482&iLanguageID=1&key=HW-AFX-FF1152-300
They are really simple with the prototype area easiliy accessible.
However, they say: ''The AFX board should NOT be used when designing
with or characterizing RocketIO™ transceivers''

I could only find something here:
http://www.insight.na.memec.com/Memec/iplanet/link1/VirtexIIPro_FF1152_2.pdf

...but it doesn't look too appealing to me.

Regards,
David

Peter Alfke <peter@xilinx.com> wrote in message news:<BD354F7F.7D3D%peter@xilinx.com>...

You can use RocketIO.
In Virtex-IIPro it can handle 3.125 Gbps, which means a ~320 ps bit time.
Just run the MGT with a 156.25 MHz Fref, and apply the appropriate data
pattern on the parallel ( 10 or 20-bit) side.
In Virtex-IIProX you can go more than 3 times faster...
Peter Alfke


From: gretzteam@hotmail.com (David)
Organization: http://groups.google.com
Newsgroups: comp.arch.fpga
Date: 3 Aug 2004 14:11:48 -0700
Subject: Can I use RocketIO to generate pulse edge with very high precision?

Hi,
I need to generate a 1-bit signal with very high resolution on the
position of the edges. I would need about 2 to 3GHz resolution. It is
quite hard to have a 3Ghz clock nowadays, so I wonder if the RockedIO
could be used for that.

Thanks,
Dave