How many 4x4 bit multipliers are required for 8x8 bit binary multiplier?

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Hi.

Does anyone know How many 4x4 bit multipliers are required for 8x8 bit binary multiplication?
I don't know how to know this.
 

It depends how many cycles you want the result in. You could use just one if you have multiple cycles, or you might want 4 if you want a 16-bit result.
 

jbeniston said:
It depends how many cycles you want the result in. You could use just one if you have multiple cycles, or you might want 4 if you want a 16-bit result.
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I don't understand it Would you please let me know more? How could you know about that ? Is there any reference to let me know regarding your answer?
 

jbeniston is referring to sequential multiply algorithms which are most likely not your focus.

know how to know this
Click to expand...
I think remembering some secondary school mathematics can help. (a+b)(c+d) = ac + ad + ...

You get 4 product terms, the same with your problem. I presume you know that adders are required, too.
 

Does anyone know how to implementing multiplication of 8 bit numbers with 4bit multi?

Hi.

I want to know how to implementing multiplication of 8 bit numbers with 4 bit multipliers.
Is there any reference example?

Thanks for advanced.
 

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