nw_prbs_pkg Package Body Reference

Package >> nw_prbs_pkg

Functions
t_slv_arr	f_gen_prbs ( poly: in std_logic_vector data_width: in positive length: in positive msb_first: in boolean init: in std_logic_vector )
	Create PRBS sequence.
t_slv_arr	f_gen_prbs ( poly: in std_logic_vector data_width: in positive length: in positive msb_first: in boolean true )
	Create PRBS sequence.

Member Function Documentation

f_gen_prbs() [1/2]

t_slv_arr f_gen_prbs (   poly in std_logic_vector ,   data_width in positive ,   length in positive ,   msb_first in boolean ,   init in std_logic_vector   )

Function

Create PRBS sequence.

Parameters

poly	Polynomial to use
data_width	Data width
length	Number of data words
msb_first	Pack bits MSB in data words first (True), or LSB (False)
init	LFSR init value

Returns

PRBS sequence in data array

Generate a PRBS sequence of given length and data width. The LFSR uses Galois configuration. Example maximum length polynomials up to order 32 can be found as constants. Init value cannot be zero (would return all zero array).

Example use

array_8bit := f_gen_prbs(C_POLY_X6_X5_1, 8, 6, C_MSB_FIRST, "1111111");

f_gen_prbs() [2/2]

t_slv_arr f_gen_prbs (   poly in std_logic_vector ,   data_width in positive ,   length in positive ,   msb_first in boolean true   )

Function

Create PRBS sequence.

Parameters

poly	Polynomial to use
data_width	Data width
length	Number of data words
msb_first	Pack bits MSB in data words first (True, default), or LSB (False)

Returns

PRBS sequence in data array

This is an overloaded verison of f_gen_prbs with init value set to all 1's.

Example use

array_8bit := f_gen_prbs(C_POLY_X6_X5_1, 8, 6);

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The documentation for this class was generated from the following file:

• nw_util/src/nw_prbs_pkg.vhd