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mark_alin
Joined: 26 Jul 2005
Posts: 2
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 26 Jul 2005 3:15 how to optimize a MUX with 256 input pins to reduce area? |
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how to optimize a MUX with 256 input pins to reduce area? I find that the area of the MUX is too large.
thanks a lot!
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bg21359
Joined: 01 Mar 2005
Posts: 56
Helped: 2
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26 Jul 2005 8:05 Re: how to optimize a MUX with 256 input pins to reduce area |
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Maybe you can do 8:1 mux (total 32), then 8:1 mux(total 4), then 4:1 mux.
So total you need 36 8:1 mux and 1 4:1 mux
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26 Jul 2005 8:05 Ads |
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papertiger
Joined: 28 Dec 2002
Posts: 66
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28 Jul 2005 8:08 Re: how to optimize a MUX with 256 input pins to reduce area |
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feed it into DC, I think the DC will give you a better result.
Mux may be to big for area, but it may be the least wire routing.
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soccer
Joined: 30 Jul 2004
Posts: 176
Helped: 2
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28 Jul 2005 8:34 how to optimize a MUX with 256 input pins to reduce area? |
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| using dc to solve your problem. or other asic synthesis tools.
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amaccormack
Joined: 07 Jul 2005
Posts: 59
Helped: 3
Location: Scotland, UK
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28 Jul 2005 10:21 Re: how to optimize a MUX with 256 input pins to reduce area |
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| If your synthesis tool cant improve the area much (make sure its optimizing for area, not time) then you may have other options, depending on what you are muxing. For example, making the outputs of the 256 things that you are muxing be =0 when not in use, then just ORing the outputs together. Or tristates, if your DFT methodology allows it (probably not a good idea). Or, can you rearrange these 256 things into a shift register structure. Or, if they are just memory elements, how about using a RAM instance?
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