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Discussion Groups | TMS320C55x | query regarding c55x MAC units

Technical discussions about the TI C55x DSPs (including the c5501, c5502, c5503, c5507, c5509, c5510 and OMAP5910).

  

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query regarding c55x MAC units - p_kdl - Jan 10 8:56:55 2007



Hi,

   Why the C55x MAC uints are of 17 bits width?
   what is  the significance of going for 17 bit multiplier?

  thanks and regards
Pradeep Kumar.
Tata Elxsi


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Re: query regarding c55x MAC units - Jeff Brower - Jan 10 13:25:08 2007

Pradeep-

>    Why the C55x MAC uints are of 17 bits width?
>    what is  the significance of going for 17 bit multiplier?

I believe it allows the multiplier circuit to set the 17th bit to zero for unsigned
multiplies.  Then the circuit can always perform the same 2s-complement algorithm and
still get correct answers for either signed or unsigned multiplies.  Just a guess,
but probably it's less overall silicon.

-Jeff


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