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wht is theory behind floating pins

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shiv_emf

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Hi,

What is theory behind floating pins i.e pins inside ASIC .. are they allowed to float.

Floating mean value of 'z' .. confirm?

do floating pins increase power consumption ?
 

It is possible to have a tristate buss internal to your chip, but it is typically because you have multiple drivers of the buss and at least one driver is always driving the buss, it should never be allowed to float to "Z" or it will increase power consumption.
 

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    shiv_emf

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yes i agree, But my question is whether output pins of submodule can be left floating?
 

Yes they can, but why are they there? Is this an IP block where you do not need all the outputs? If its a block you designed then you should try to optimize out the logic which is driving the open outputs because it is wasted space on you chip.
 

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    shiv_emf

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Yes may be ! its not an ip.
thanks
 

One more thing to be noted..u need not leave floating inputs to be left... u should tie high or tie low the inputs..If u leave inputs floating noise may tigger it and affect logic and power consumption too..

Shankar
 

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    shiv_emf

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shiv_emf said:
yes i agree, But my question is whether output pins of submodule can be left floating?
Click to expand...

I dont think there is any issue if the output pins are floating.
 

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    shiv_emf

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oh thanks !

we actually can remove logic sitting inside module which is driving that output.
 

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