4x4 multiplier using shift register

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tusharkumar101

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design 4x4 multiplier using half adder full adder and 8 bit shift register
 

@tusharkumar101:

Please show your code so far. I am sure we can answer specific questions after you have done your own work first.
 

tusharkumar101 said:
design 4x4 multiplier using half adder full adder and 8 bit shift register
Click to expand...

A3 A2 A1 A0
*
B3 B2 B1 B0
--------------------------------------------------
A3&B0 A2&B0 A1&B0 A0&B0
+
A3&B1 A2&B1 A1&B1 A0&B1
+
A3&B2 A2&B2 A1&B2 A0&B2
+
A3&B3 A2&B3 A1&B3 A0&B3
-------------------------
C7 C6 C5 C4 C3 C2 C1 C0

so in abstract form :

for i in 0 to 3 loop
wait for rising_edge(clk);
C <= C + (A AND {B(i),B(i),B(i),B(i)} ) sll i); --shift register is used to shift AB(i)...--adder to add c+ab.
end loop;
 

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