Equivalence between "XtremeDSP48 slice" and "slices of progr

Thu Dec 22, 2011 7:59 am   

Hi folks!
In this page (http://zone.ni.com/reference/en-XX/help/371599F-01/lvfpgaconcepts/dsp48e_top/) I've found this:

"Each DSP48E slice (Xilinx Virtex-5) is equivalent to over 500 slices of programmable logic, consumes 1/10th the power of an equivalent logic implementation".

Does anyone have the same info for XtremeDSP48 (Virtex-4)?

Thank you for your answer.

Thu Dec 22, 2011 9:30 am   

On 22 Dez., 06:59, MN <mazouz.nezh...@gmail.com> wrote:

Hi,
the V4 silicon may use a different technology, but basically the same
rule applies.
A DSP48 consists of a multiplier and some adders,muxes and registers.
All of this is made as a real hardmacro, so almost no power for
configuration and storage elements is wasted like what is needed in
LUTs.(Just a few MUX config bits to bypass registers etc..)
The number of V4 Slices to create some DSP48 alike design will
probably be higher, since V$ Luts have only four inputs, while V5 LUTS
have six.

More accurate information may be derived from the V4 datasheets, or
open a thread in the forums at xilinx if no satisfying answer appears
here.

Have a nice synthesis
Eilert

Thu Dec 22, 2011 10:05 am   

Thank you backhus for the quick answer.

Thu Dec 22, 2011 5:47 pm   

I've found this:

implementation".

Those numbers are in the category of "marketing b**ll*x", and should not b
relied upon for any serious purpose.


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