CRC blocks 0 / 1 (Fitter Resource Usage Summary)

[Altera_Forum]

I'm using Quartus II 9.1sp2, and compiling for a Cyclone II EP2C5T144C8. 

In the Fitter Resource Usage Summary it lists an entry that says:  CRC blocks: 0 / 1 (0%)  In the design options I already turned on the automatic periodic integrity check. The question now is, what is this unused CRC block, and how could I make use of it?

[Altera_Forum]

Hi, 

 See Application Note 539.  AN 539: Test Methodology of Error Detection and Recovery using CRC in Altera FPGA Devices.  Page 7: Using the Error Detection CRC Feature.  You can use a "CRC Block WYSIWYG Atom" to interface from user logic to the error detection circuit.  There is a Template under "C:\altera\81\quartus\libraries\vhdl\wysiwyg"  ------------------------------------------------------------------ -- cycloneiii_crcblock parameterized megafunction component declaration -- Generated with 'mega_defn_creator' loader - do not edit ------------------------------------------------------------------ component cycloneiii_crcblock generic (  lpm_type : string := "cycloneiii_crcblock" ); port (  clk : in std_logic := '0';  crcerror : out std_logic;  ldsrc : in std_logic := '0';  regout : out std_logic;  shiftnld : in std_logic := '0'  ); end component;