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04-11-2006, 06:59 AM
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To use adder and multiplier of DSP48 in V4
Hi all,
Is it possible to use the adder and multiplier in the DSP48 block of the virtex4 FPGA separately but simultaniously. From the user guide i get a feeling "No" but i wanted to know your expert openion on this issue. Thanks and regards Sumesh V S 
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04-12-2006, 03:46 PM
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Re: To use adder and multiplier of DSP48 in V4
vssumesh wrote:
> Hi all, > Is it possible to use the adder and multiplier in the DSP48 block of > the virtex4 FPGA separately but simultaniously. From the user guide i > get a feeling "No" but i wanted to know your expert openion on this > issue. > Thanks and regards > Sumesh V S > No, in fact the adder is always used with the multiplier. The adder is actually a tree adder that combines the multiplier partial products and an additional term from the C input. It is still used to combine multiplier partial products even if you don't use the C input (not using it forces a 0 into that input of the adder tree.
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