# how to design this datapath unit for DSP using VHDL/Verilog?

#### Do you have a question? Post it now! No Registration Necessary

Translate This Thread From English to

•  Subject
• Author
• Posted on
Dear all,

I want to design an arithmatic datapath unit for digital signal processing
using VHDL and/or Verilog.

The input are 5 elements(either sequential or parallel) each having 8 bits.
It needs to multiply each of these 5 inputs with a predefined constant
matrix(10x10, floating point scaled and round to integer). The output will
be a 10x10 matrix summing the above five matrices up, each element having 12
bits). So for each element of the matrix, I can have a MAC unit. The
internal computation will be 16 bits.

Hence for each 5 inputs x1, x2, x3, x4, x5, the output matrix

Y=x1*C1+x2*C2+x3*C3+x4*C4+x5*C5 where Y, C1, C2, C3, C4, C5 are matrices;

If I put an MAC for each element, I will have a purely parallel
architecture, but I need 100 16bits MAC units, which will be too resource
consuming.

I am considering to make a parallel-serial architecture, at each time, it
outputs one row, which will be 10x12 bits... so the output will be
row-by-row.

I also need to consider to streamlize the datapath operation. Since there
will be a stream of 5 elements input in a non-stop fashion, the output will
also be non-stop streaming. So after one row is outputted, that row can be
used for computation/storage of the results for the next 5 input elements.

I am ok so far in thinking... but further thinking makes me confused and
perplexed... how to do sequential timing control(how to what to do at which
cycle)? do I need to pipelining? how to design the architecture?

Finally, how to program this? Is there any examples for this?

Thanks a lot,

-Walala

Re: how to design this datapath unit for DSP using VHDL/Verilog?
Dear all,

I want to design an arithmatic datapath unit for digital signal processing
using VHDL and/or Verilog.

The input are 5 elements(either sequential or parallel) each having 8 bits.
It needs to multiply each of these 5 inputs with a predefined constant
matrix(10x10, floating point scaled and round to integer). The output will
be a 10x10 matrix summing the above five matrices up, each element having 12
bits). So for each element of the matrix, I can have a MAC unit. The
internal computation will be 16 bits.

Hence for each 5 inputs x1, x2, x3, x4, x5, the output matrix

Y=x1*C1+x2*C2+x3*C3+x4*C4+x5*C5 where Y, C1, C2, C3, C4, C5 are matrices;

If I put an MAC for each element, I will have a purely parallel
architecture, but I need 100 16bits MAC units, which will be too resource
consuming.

I am considering to make a parallel-serial architecture, at each time, it
outputs one row, which will be 10x12 bits... so the output will be
row-by-row.

I also need to consider to streamlize the datapath operation. Since there
will be a stream of 5 elements input in a non-stop fashion, the output will
also be non-stop streaming. So after one row is outputted, that row can be
used for computation/storage of the results for the next 5 input elements.

I am ok so far in thinking... but further thinking makes me confused and
perplexed... how to do sequential timing control(how to what to do at which
cycle)? do I need to pipelining? how to design the architecture?

Finally, how to program this? Is there any examples for this?

Thanks a lot,

-Walala