Example

• LIBRARY <name>, <name> ;

  • name is symbolic and define by compiler tool.
  • Note: Remember that WORK and STD do not need to be defined.
    

• USE lib_name.pack_name.object;

  • ALL is a reserved word.
    

• Placing the Library/Use clause 1st will allow all following design units to access it.

LIBRARY ieee;

USE ieee.std_logic_1164.all;

ENTITY cmpl_sig IS

PORT ( a, b, sel : IN std_logic;

x, y, z : OUT std_logic;

END cmpl_sig;

ARCHITECTURE logic OF cmpl_sig IS

BEGIN

-- simple signal assignment

x <= (a AND NOT sel) OR (b AND sel);

-- conditional signal assignment

y <= a WHEN sel='0' ELSE

b;

-- selected signal assignment

WITH sel SELECT

z <= a WHEN '0',

b WHEN '1',

'0' WHEN OTHERS;

END logic;

CONFIGURATION cmpl_sig_conf OF cmpl_sig IS

FOR logic

END FOR;

END cmpl_sig_conf;

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