![]() Uut : serial_adder PORT MAP ( Clk,reset,a,b,cin,s,cout ) Component Declaration for the Unit Under Test (UUT) If ( reset = ' 1 ' ) then -active high resetĬ := cin -on first iteration after reset, assign cin to c.įlag <= ' 1 ' -then make flag 1, so that this if statement isnt executed any more.Ĭ := ( a and b ) or ( c and b ) or ( a and c ) -CARRY we use variable, so that we need the carry value to be updated immediately. S,cout : out std_logic -note that s comes out at every clock cycle and cout is valid only for last clock cycle. Port ( Clk,reset : in std_logic -clock and reset signalĪ,b,cin : in std_logic -note that cin is used for only first iteration. Note that we dont have to mention N here. Though I have used behavioral level approach to write my code, it should be straight forward to understand if you have the basics right. In this post, I have used a similar idea to implement the serial adder. The D flipflop is used to pass the output carry, back to the full adder with a clock cycle delay. The above block diagram shows how a serial adder can be implemented.
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