Package >> nw_crc_pkg

Functions
std_logic_vector	f_gen_crc ( poly: in std_logic_vector data: in t_slv_arr init: in std_logic_vector msb_first: in boolean C_MSB_FIRST )
	Calculate CRC.
std_logic_vector	f_gen_chksum ( data: in t_slv_arr chksum_width: in positive use_carry: in boolean True )
	Calculate sum-of-words checksum.

Member Function Documentation

◆ f_gen_crc()

std_logic_vector f_gen_crc	(	poly in std_logic_vector ,
		data in t_slv_arr ,
		init in std_logic_vector ,
		msb_first in boolean C_MSB_FIRST
	)

Function

Calculate CRC.

Parameters

poly	CRC polynomial to use (3-bit or longer)
data	Data array
init	CRC init value (same width as poly)
msb_first	Extract most significant bits first if True (default), least significant bits if False

Calculate CRC checksum of data array.

Example use

array_8bit := (x"11", x"22", x"33", x"44", x"55", x"66", x"77");

v_crc_32 := f_gen_crc(C_ETH_CRC32, array_8bit, x"ffffffff"); -- v_crc_32 is now x"97aee1d3"

Function

Calculate sum-of-words checksum.

Parameters

data	Data array
chksum_width	Checksum width
use_carry	Add carry to checksum (default True)

Calculate sum-of-words checksum of data array. The data array should have the same width as the checksum, which is accomplished with e.g. f_repack().

Example use

array_16bit := (x"4500", x"0073", x"0000", x"4000", x"4011", x"0000", x"c0a8", x"0001", x"c0a8", x"00c7"); -- IPv4 Header

v_chksum := not f_gen_chksum(array_16bit, 16); -- v_chksum is now x"b861", which is the IPv4 header checksum

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