Parameter array in Verilog

mwn1 · May 7, 2014

Hi,
is it possible to create parameter array in verilog? for example, anything like the following

parameter[`TOTAL-1 : 0] PARAM_ARRAY = {1, 0, 0, 2}

if it is not possible, what could be the alternative solution?

Thanks in advance

dave_59 · May 7, 2014

It's easy in SystemVerilog

Code:

parameter int PARAM_ARRAY[`TOTAL] = {1, 0, 0, 2};

If N has the value 3, PARAM_ARRAY[N] will have the value 2.

However in Verilog, you will have to pack all the elements into a single big vector.

Code:

parameter  [0:(`TOTAL*32)-1] PARAM_ARRAY = {32'd1, 32'd0, 32'd0, 32'd2};

If N has the value 3, PARAM_ARRAY[N*32+:32] will have the value 2.

mwn1 · May 7, 2014

hi dave_59,
thanks for you reply.
if i understood correctly, you wanted to mean in the last line is that

Code:

PARAM_ARRAY[N*32: (N+1)*32-1]

will have the value N-th number of the PARAM_ARRAY. so if N=3, then it will have 32'd2

please correct me if im wrong

dave_59 · May 7, 2014

You cannot have a variable expression for both the MSB and LSB of a range. The syntax I showed is called an indexed part-select. See 11.5.1 Vector bit-select and part-select addressing of the IEEE 1800-2012 LRM.

mwn1 · May 8, 2014

thanks mate

Parameter array in Verilog

mwn1

Newbie level 3

dave_59

Advanced Member level 3

mwn1

rajavel.rv

mwn1

Newbie level 3

dave_59

Advanced Member level 3

mwn1

mwn1

Newbie level 3

Similar threads

Parameter array in Verilog

Newbie level 3

Advanced Member level 3

Newbie level 3

Advanced Member level 3

Newbie level 3

Similar threads

Privacy & Transparency

Privacy & Transparency