Can somebody explain what the following line of code does? Google search did not turn up anything useful.
data_count <= (others => ’0’);
Thanks!
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2 Answers
It sets all elements of data_count to '0'.
The datatype of data_count would be an array of elements that can be '0', like bit_vector, std_logic_vector, signed or unsigned. If your signal data_count has four bits, this would be equivalent to writing:
data_count <= "0000";
with the advantage that you don't have to count the bits.
You can also set certain elements to '1' and then the rest to '0':
data_count <= (1 => '1', 3 => '1', others=>'0');
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This statement sets all the elements to'0'
You can also use this statement as others => '1' this will set elements to '1'
suppose data_count is a std_logic_vector( 6 downto 0 ) ,
then the data_ count will be assigned as data_count <= "0000000"
suppose you write data_count <= (5 => '1' , others => ’0’);
and data_count suppose is a std_logic_vector( 7 downto 0 ) , this means 6th bit is 1 and rest are 0 ie
data_count <= "00100000" ;
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