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i am working on a vhdl code (virtex 6). where i need to do number of multiply and accumulate operation. how do i use dsp slices for this(an in the instantiation and inference). Are there any examples which can help me?

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Look here in ISE:

Edit > Language Templates > VHDL > Device Primitive Instantiation > Virtex 6 > Arithmetic Functions

A detailed user guide for the DSP slice is available from the Xilinx Website. It explains the function of every port on the entity.

If you want a better answer, you need to give far more detail in your question.

scary_jeff
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