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HighConn and LowConn of input port in IEEE 1801 UPF standard

Rama Kishore

Hi,

While referring to 1801 UPF standard, I came across the below statements in "create_supply_port" command section:

     a) The LowConn of an input port is a source.

     b) The HighConn of an input port is a sink.

I am confused over these statements. For instance regarding point-(a), from my understanding, the LowConn side (i.e in the child instance) of a input port should be a sink (i.e load). Because  input supply port is the one that provides power to the internal circuit/logic of the instance. Hence this circuit/logic should act as a sink (i.e load) to the input port. But why is the standard specifying it a source? Am I missing something here?

 Will really appreciate, your help in understanding this better.

Regards

Kishore.

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