FPGA Central

Hi,
I want to expand unsigned 4*4 module to signed 16*16 module and cannot
find any references.

Who knows it please give me a help.

Thank you.

Weng

Weng Tianxiang wrote:

> I want to expand unsigned 4*4 module to signed 16*16 module and cannot
> find any references.

Post your 4*4.

On Jun 27, 6:10*pm, Mike Treseler <mtrese...@gmail.com> wrote:
> Weng Tianxiang wrote:
> > I want to expand unsigned 4*4 module to signed 16*16 module and cannot
> > find any references.
>
> Post your 4*4.

Hi Mike,
Here it is a Xilinx invention about 4*4 module.
http://www.google.com/patents/about?...=0&as_maxy_is=
Configurable logic block with and gate for efficient multiplication in
FPGAS by Xilinx Kenneth D. Chapman et al in FIG. 9, 16 and 17.

Weng

Weng Tianxiang wrote:

> Here it is a Xilinx invention about 4*4 module.

The topic of this newsgroup is vhdl.

-- Mike Treseler

On Jun 27, 8:39*pm, Weng Tianxiang <wtx...@gmail.com> wrote:
> Hi,
> I want to expand unsigned 4*4 module to signed 16*16 module and cannot
> find any references.
>
> Who knows it please give me a help.
>
> Thank you.
>
> Weng

To use a multiplier module, you must consider the product output from
this module to be a partial product which is added to the other
partial products to form the complete product. To do a 16x16 multiply
using 4x4 multiplier modules will require 16 of these modules.
Consider each 16 bit number to be composed of

a3*2**12 + a2*2**8 + a1*2**4 + a0 and b3*2**12 + b2*2**8 + b1*2**4 +
b0

Your partial products will be a0*b0 + a0*b1*2**4 + a1*b0*2**4 +
a1*b1*2**8 + ...

I think you can see where this is going.

Rick