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vhdl multiplier 4 bit by 4 bit design with shift registers and adder

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HARD_VHDL

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How can I code this multipler?

4 * 4 signed multiplier with shift register and adder.

Would I get some examples?

Please help me.
 

Hi,

There are many ways to do it:

An easy to understand method:

* To find out sign of result: XOR both input sign bits
* then make both inputs positive ( ==> only 3 bits unsigned)
* multiply both values: 3 bits x 3 bits = 6 bits result
* If the result is negative (output of XOR) then invert the multiplication result
* form a 7 bit signed integer

Just the 3 x 3multiplication:
Let's say ABC are the three bits of the first multiplicator
And XYZ of the second multiplicator:

ABC x XYZ =
Code: 
C x 00XYZ
B x 0XYZ0
A x XYZ00
---------
=  RRRRRR


Klaus
 

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