I have tried structural modeling examples from Bhasker in Quartus . I cannot rectify the following error.
entity HALF_ADDER is
port(A,B: in BIT ; SUM ,CARRY:out BIT);
end HALF_ADDER;
architecture HA_STRUCTURE of HALF_ADDER is
component XOR2
port (X,Y:in BIT; Z:out BIT);
end component ;
component AND2
port (X,Y:in BIT; Z:out BIT);
end component;
begin
X1:XOR2 port map(A,B,SUM);
A1:AND2 port map(A,B,CARRY);
end HA_STRUCTURE;
ERROR
Error: Port "X" does not exist in primitive "AND2" of instance "A1"
Error: Port "Y" does not exist in primitive "AND2" of instance "A1"
Error: Port "Z" does not exist in primitive "AND2" of instance "A1"
Error: Can't elaborate top-level user hierarchy
Error: Quartus II Analysis & Synthesis was unsuccessful. 4 errors, 0 warnings
Error: Peak virtual memory: 216 megabytes
Error: Processing ended: Mon Dec 20 06:08:46 2010
Error: Elapsed time: 00:00:01
Error: Total CPU time (on all processors): 00:00:01
Error: Quartus II Full Compilation was unsuccessful. 6 errors, 0 warnings
Kindly also mention the right documentation to refer
