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[palpandi.anna@gmail.com]

hai to all,

     i just wanted to know the logic inside LUT in configurable logic block.please tell me 

Thanks in advance......

[eilert]

Hi,

haven't you searched this forum or comp.arch.fpga before?

This question has been asked often.

In short:

Logically you can see it as a ROM, the actual implemetation is more like a big MUX, in the end it's all transistors on the silicon.

See other threads for details.

Have a nice synthesis

  Eilert

[rcingham]

Note also that the details vary between FPGA families.

[joy1887]

just have a look on data sheet of any FPGA board

[austin]

or....

Look up "look up tables"

Or, you could look up the Xilinx patent that started it all:

http://www.google.com/patents/US4706216