Why GXB are used in the FPGA

[rocking1234]

I want to know why the GXb are used inside the fpga .......?

 

[rberek]

Well, if you need high speed serial bus capabilities, then you instantiate Gigabit Tranceivers in your FPGA.

r.b.

 

[b737_800]

personnaly i have used it to interconnect multiple FPGA boards. The goal was to build a virtual board suitable for large designs

 

[rocking1234]

The input data rate to the bord is nearly 3gbps and how does this gxb convert this high speed serial data to 40 bits parallel data. I have looked at the gxb architeture that I found it has a CRU[clock recovery unit] that extract the high speed serial clock from the input data signal. and then the pll makes it phase shited to sync with the incoming signal. But my question is how does this CRU recover the high speed clock from the incoming data signal