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spartan- 3an xc3s700an I/O PINS HELP

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mv09021991

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Anyone have a Idea about how to use differential pair connector in spartan3an?
I am aware about how to make .ucf file. but i am not able to get how to use TXN_0 and TXP_0 in .ucf as i have only the single bit to transmit. but here two pins for single bit is given.

here is the location for differential transmitter/Receiver.
https://obrazki.elektroda.pl/7251972800_1397583404.png
 

You should use:

IBUFDS -- differential input buffer, single bit output
IBUFDS_DIFFOUT -- differential input buffer, both bit and inverse out (used when you need two IDELAY elements)
IOBUFDS -- differential input/output buffer
OBUFDS -- differential output buffer
IBUFGDS -- differential input buffer connected to a global clock network (BUFG or etc...)
 

For Spartan3an, I have received data through Rx differential pair.
but how can i see this one bit data in user defined LED's.

Can anyone tell me about how to route the data from one location to other lacation inside the spartan3an?

Thanks.
 

Post 2 already told you to use an IBUFDS as the differential RX input. Go look it up in the Spartan 6 libraries guide.

I and IB are from the pins and O goes into the FPGA fabric.
 
As already pointed out, you must have both pins in your top entity, and convert to/from a single ended signal by instantiating one of the buffers mentioned in post #2.

It is a bit different in the Altera world. There you can have a single-ended top port and tell the tools via constraints that it is a differential I/O. It is also possible to manually instantiate the differential buffers.
 

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