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Visitor

Posts: 4

Registered: ‎07-01-2010

Virtex 6 GTX 64/66 MMCM

‎03-06-2012 06:10 AM

HI,

How can I use all GTX transceivers in xc6vhx255t ff1923 with 64B/66B coding? According to documentation (ug366) I have to use 2 MMCMs for one Quad. One MMCM is required for TX (TXOUTCLK - CLKIN) and another for RX (RXRECCLK - CLKIN), but xc6vhx255t ff1923 has only 6 MMCMs for all 6 Quads.

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Xilinx Employee

Xilinx Employee

Posts: 615

Registered: ‎04-06-2010

Re: Virtex 6 GTX 64/66 MMCM

‎03-09-2012 08:50 PM

Do you plan to run them all at the same rate?

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Visitor

Posts: 4

Registered: ‎07-01-2010

Re: Virtex 6 GTX 64/66 MMCM

‎03-09-2012 09:23 PM

Yes, all GTX run at the same rate 5 Gb/s. 6 Channels x4.

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Xilinx Employee

Xilinx Employee

Posts: 615

Registered: ‎04-06-2010

Re: Virtex 6 GTX 64/66 MMCM

‎03-22-2012 07:11 PM

Have you looked at how the clocking looks when you generate an Aurora core with many lanes used. You may be able to mimic the clocking.

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