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Identify the logic function of a layout

gonsays

Hello,

I'm a Microelectronics student and I'm in a struggle to understand which logic function is associated with the following layout:

It says that the circuit has four inputs (A and B) and one output (y), in an N-WELL TECHNOLOGY.

Thank you very much in advance and I'm sorry for my basic question for you

Parents

  • The top one appears to have three inputs and one output (there are three unconnected gate strips, and only one metal output region). The logic seems a little odd, because if all three inputs are high, then the output will be low, and assuming the inputs are called a, b, c (left to right gates), then if a is low, or b+c are low, then the output will be high. If however a is high and either b or c is low (but not both), then the output will be floating.

    The middle layout is too hard to follow in the black and white picture - it's hard to see where the inputs and outputs are or what is connected.

    The bottom is a 2-input OR gate. (it's a 2 input NOR gate with an inverter on the output).

    Not sure what this has to do with Cadence because from the top picture you aren't using a Cadence layout editor as far as I can see...

    Maybe you should speak to your supervisor or tutor on your course?

    Regards,

    Andrew.

Reply

  • The top one appears to have three inputs and one output (there are three unconnected gate strips, and only one metal output region). The logic seems a little odd, because if all three inputs are high, then the output will be low, and assuming the inputs are called a, b, c (left to right gates), then if a is low, or b+c are low, then the output will be high. If however a is high and either b or c is low (but not both), then the output will be floating.

    The middle layout is too hard to follow in the black and white picture - it's hard to see where the inputs and outputs are or what is connected.

    The bottom is a 2-input OR gate. (it's a 2 input NOR gate with an inverter on the output).

    Not sure what this has to do with Cadence because from the top picture you aren't using a Cadence layout editor as far as I can see...

    Maybe you should speak to your supervisor or tutor on your course?

    Regards,

    Andrew.

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