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Visitor 44026
Visitor
48,883 Views
Registered: ‎04-21-2008

What does GTP/GTX stand for?

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Dear Xilinx people,

 

this may look like a silly question but what does GTP and GTX mean? I couldn't find a definition for that anywhere.... I suppose GT is for "Gigabit Transceiver" evolved from the MGT, but does "P" & "X" have a special meaning? I refer to the transceiver in my diploma thesis and want to give a short definition what the names stand for.

 

Hope someone can clear this up...

 

Thanks,

Chris

1 Solution

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Xilinx Employee
Xilinx Employee
62,891 Views
Registered: ‎08-13-2007

Re: What does GTP/GTX stand for?

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Chris,

 

Officially - they have no meaning... They are just names for primitives.

Each of our transceivers has so far had a unique library name:

GT - Virtex-II Pro

GT10 - Virtex-II Pro X

GT11 - Virtex-4 FX

GTP - Virtex-5 LXT/SXT

GTX - Virtex-5 FXT/TXT

 

I have heard several different internal comments on the origin of the GTP/GTX naming, but nothing that is official... You should just call them what they are... ;)

8 Replies
Xilinx Employee
Xilinx Employee
62,892 Views
Registered: ‎08-13-2007

Re: What does GTP/GTX stand for?

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Chris,

 

Officially - they have no meaning... They are just names for primitives.

Each of our transceivers has so far had a unique library name:

GT - Virtex-II Pro

GT10 - Virtex-II Pro X

GT11 - Virtex-4 FX

GTP - Virtex-5 LXT/SXT

GTX - Virtex-5 FXT/TXT

 

I have heard several different internal comments on the origin of the GTP/GTX naming, but nothing that is official... You should just call them what they are... ;)

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Visitor 44026
Visitor
48,867 Views
Registered: ‎04-21-2008

Re: What does GTP/GTX stand for?

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Hm, okay. I never had guessed that. 

I will just describe what they do... ;-)

 

Thanks,

 

Chris

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Xilinx Employee
Xilinx Employee
48,857 Views
Registered: ‎08-13-2007

Re: What does GTP/GTX stand for?

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Good luck.

 

The GTP and GTX transceivers are architecturally very similar.

The details are outlined in the respective User Guides and datasheets.

But the high-level differences are:

-GTX supports higher line rates (and different REFCLK rates)

-GTX adds the TX and RX gearboxes (64/66, 64/67)

-GTX adds the decision feedback equalizer between the RX EQ and RX CDR.

-GTX dissipates more power

-slight changes to board design (MGTAVCCPLL voltage and MGTRREF resistor value)

 

The Architecture Wizard and Chipscope Serial I/O Toolkit (IBERT) are good resources to be aware of.

 

The GTP/GTX are very different from the GT11 - I guess it could be argured they are next closest to the GT, but there are still a fair amount of differences there.

 

 

bt

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Newbie mydavisl
Newbie
47,533 Views
Registered: ‎12-30-2008

Re: What does GTP/GTX stand for?

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GTP stands for Gigabit Transceiver with Low Power.
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Visitor pbeerdeke
Visitor
38,969 Views
Registered: ‎12-16-2011

Re: What does GTP/GTX stand for?

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Xilinx ug190 defines the GT prefix as "Gunning Transceiver" on pg248

http://www.xilinx.com/support/documentation/user_guides/ug190.pdf

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Xilinx Employee
Xilinx Employee
38,964 Views
Registered: ‎01-03-2008

Re: What does GTP/GTX stand for?

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UG190 is the Virtex-5 FPGA User Guide and page 248 is referring to two SelectIO standards GTL and GTLP that are used primarily in telecom backplane applications.  In this context, GT does means Gunning Transceiver, but it has nothing to do with the original question regarding the high speed serial transceivers GTP and GTX blocks. 

 

That question was answered 3 years ago.

------Have you tried typing your question into Google? If not you should before posting.
Too many results? Try adding site:www.xilinx.com
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Teacher rcingham
Teacher
38,923 Views
Registered: ‎09-09-2010

Re: What does GTP/GTX stand for?

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"That question was answered 3 years ago."

It would make sense to lock these old threads...

------------------------------------------
"If it don't work in simulation, it won't work on the board."
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Observer naz_sw
Observer
3,538 Views
Registered: ‎02-25-2019

Re: What does GTP/GTX stand for?

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It would make sense to clarify the answer (things may have finally got their official definitions after 10 years passed since the original question)

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