Hello
I want to know about the Rev F07 net length.
I found and downloaded Rev B net length document. is there any differences between Rev B and Rev F net length?
I'm working with high Speed ADC and DAC (200MSPS) and I really need it.
Thanks
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Moderator(63)
Hello xsawq21,
We have the Rev F Net length report available for your download located here http://zedboard.org/support/documentation/4736
--Josh
Junior(2)
my board is MicroZed ZYNQ 7020.
even in the above link, I couldn't find anything about the Rev F07.
Thanks
Moderator(63)
My apologies, for some reason I just assumed PicoZed. I have made a request for the Net Length Report.
--Josh
Moderator(63)
Hi,
I just posted the MicroZed RevF Net Length Report in the same location as the RevB Report.
Regards,
Josh
Junior(2)
Dear
I want to rout high speed LVDS pairs to MicroZed (200MHz)
I checked all the documents. the below pic is a part of the below document:
http://zedboard.org/sites/default/files/documentations/5274-MicroZed-Car...
as you see I have to tune the lengths within 10mils (no problem) but when I checked the Length Document that you have uploaded before I see 1 cm mismatch between the pairs on the MicroZed SOM!!!
even in the first blanket we have 16mm of mismatch between one pair (P to N)!!!
between the first and second pairs there is 24mm of mismatch!!! it's disaster!
for JX1:
for JX2:
Junior(2)
Dear
I want to rout high speed LVDS pairs to MicroZed (200MHz)
I checked all the documents. the below pic is a part of the below document:
http://zedboard.org/sites/default/files/documentations/5274-MicroZed-Car...
as you see I have to tune the lengths within 10mils (no problem) but when I checked the Length Document that you have uploaded before I see 1 cm mismatch between the pairs on the MicroZed SOM!!!
even in the first blanket we have 16mm of mismatch between one pair (P to N)!!!
between the first and second pairs there is 24mm of mismatch!!! it's disaster!
for JX1:
for JX2:
Junior(2)
Dear
I want to rout high speed LVDS pairs to MicroZed (200MHz)
I checked all the documents.
http://s9.picofile.com/file/8313829926/pairs.PNG
as you see I have to tune the lengths within 10mils (no problem) but when I checked the Length Document that you have uploaded before I see 1 cm mismatch between the pairs on the MicroZed SOM!!!
even in the first blanket we have 16mm of mismatch between one pair (P to N)!!!
between the first and second pairs there is 24mm of mismatch!!! it's disaster!
for JX1:
http://s8.picofile.com/file/8313829900/jx1.png
for JX2:
http://s8.picofile.com/file/8313829918/jx2.png
Moderator(63)
Hello,
Have you reviewed the MicroZed Carrier Design Guide?
http://zedboard.org/support/documentation/1519
--Josh
Junior(2)
Yes, Actually I have sent you a pic of this document above.
http://s9.picofile.com/file/8313829926/pairs.PNG
one of pins I have showed you is PUDC that I have marked it in the table with a red blanket. it's OK. I don't use it at all for the LVDS.
but my question is: I can tune all the lengths on my carrier board within 10 mils, but there is a mismatch in the lengths around 1cm on the MicroZed SOM!
what should I do?
Thanks
Junior(2)
there is no answer?
Actually this mismatch is negligible?
Thanks
Moderator(63)
Hello xzsawq21,
Please refer to the following information:
o You will need to understand their worst case tolerances, which is typically driven by whatever you are hooking the circuit to
o You will need to incorporate the differences we left on our SOM + package delay + your routing
o Again, it all depends on WHAT you are hooking it to and what frequencies you are running at.
Regards,
Joshua
Moderator(17)
@xzsawq21 -- did you include the internal Zynq package delays?
Bryan
Junior(2)
No, you mean you have tuned the length subject to the Zynq package delays? I think it's important for above 500MHz.
I have used your length document to tune the lengths in my carrier board.
I'd would be grateful if you had any idea. :)
Thanks
Moderator(17)
The MicroZed PCB routes were originally tuned for the 7010 device in the CLG400 package. At the time of the MicroZed design, the specifications were very tight, especially in the case of the DDR3, which runs at 533 MHz. The specification was later extended to account for memory speed grade, which allowed us also to support the 7020 without changing the PCB. Several other interfaces were also tuned, all including the internal package delays.
Bryan