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WTA VHDL shift left and shift right code different

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alpha91

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Hi, i have learned the shift register code in VHDL as the following:


Code VHDL - [expand]
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if (reset = '1') then
shift <= '0000" ;
else if (clock' event and (clock= '1')) then
shift <= shift (2 downto 0) & si;



can anyone tell me this is shift left or shift right? because now i need VHDL for both shift left and shift right.
 
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Hi
shift <= shift (2 downto 0) & si;
This is shift left. Algorithm = remove left most element and add new element on right.
 

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Remove right most element and add new element on left ? :D

shift <= si& shift (3 downto 1);
 

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