Expand unsigned 4*4 module to signed 16*16 module

[Weng Tianxiang]

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

 

[Mike Treseler]

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.

 

[Weng Tianxiang]

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?id=aoQSAAAAEBAJ&dq=patent:6708191&as_drrb_ap=q&as_minm_ap=0&as_miny_ap=&as_maxm_ap=0&as_maxy_ap=&as_drrb_is=q&as_minm_is=0&as_miny_is=&as_maxm_is=0&as_maxy_isConfigurable logic block with and gate for efficient multiplication in
FPGAS by Xilinx Kenneth D. Chapman et al in FIG. 9, 16 and 17.

Weng

 

[Mike Treseler]

Weng Tianxiang wrote:

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

The topic of this newsgroup is vhdl.

-- Mike Treseler

 

[rickman]

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