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Visitor
Posts: 11
Registered: ‎04-21-2008
Accepted Solution

What does GTP/GTX stand for?

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


Accepted Solutions
Xilinx Employee
Posts: 2,502
Registered: ‎08-13-2007

Re: What does GTP/GTX stand for?

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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All Replies
Xilinx Employee
Posts: 2,502
Registered: ‎08-13-2007

Re: What does GTP/GTX stand for?

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... ;)

Visitor
Posts: 11
Registered: ‎04-21-2008

Re: What does GTP/GTX stand for?

Hm, okay. I never had guessed that. 

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

 

Thanks,

 

Chris

Xilinx Employee
Posts: 2,502
Registered: ‎08-13-2007

Re: What does GTP/GTX stand for?

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

Newbie
Posts: 1
Registered: ‎12-30-2008

Re: What does GTP/GTX stand for?

GTP stands for Gigabit Transceiver with Low Power.
Visitor
Posts: 1
Registered: ‎12-16-2011

Re: What does GTP/GTX stand for?

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

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

Xilinx Employee
Posts: 5,114
Registered: ‎01-03-2008

Re: What does GTP/GTX stand for?

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.

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Teacher
Posts: 2,113
Registered: ‎09-09-2010

Re: What does GTP/GTX stand for?

"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."

What does GTP/GTX stand for?

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