lpm xor in qu(at)rtus.parity bits for a Hamming generator

[mariac1210]

lpm xor

Hi all,

I'm trying to implement an xor gate using the lpm xor megafunction in Quartus. I need to create three parity bits for a Hamming generator. This means that I need three xor gates with three inputs. I know I can declare the three gates after the componant declaration in the archetecture. My width is 1 and the size is 3. What I'm confused about is the DATA in. In the LPM componant declaration the DATA is declared by

DATA : in std_logic_2D(LPM_SIZE downto 1, LPM_WIDTH downto 1)

I'm sending in a 4 bit string.Using the above declaration though, how do I send three specific bits into each of my xor gates? For example, gate1 needs to xor bits 1,2 and 4.

THanks
Maria

 

[FvM]

lpm xor

Why don't you simply use a VHDL XOR operator?