PPT 슬라이드

Aggregates

• Aggregates are a convenient means of grouping both scalar and composite data-types for assignment.

signal H_BYTE, L_BYTE: std_logic_vector (7 downto 0); signal DATA : std_logic_vector (15 downto 0); signal A, B, C, D : std_logic;signal WORD : std_logic_vector (3 downto 0);

( H_BYTE, L_BYTE ) <= DATA ;

WORD <= ( 2 => ‘1’, 3 => D, Others => ‘0’ ) ;

DATA <= ( Others => ‘1’) ;

WORD <= ( A, B, C, D ) ;

The total number of elements on both sides of the assignment must match, “Others” can be used as a default assignment, regardless of the array size.

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