One Row From Network - Electronic Circuits IV: Digital Logic Signals and Switch Networks Step by Step

A truth-table row is a checked circuit case before it is a table cell. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

One row starts as physical inputs

This row uses two HIGH inputs, each represented by the high rail voltage.

\text{HIGH, HIGH inputs}

The row output follows the network

The helper finds a conducting pull-down path, so the output row is LOW. The row is not accepted because someone typed a label.

\text{pull-down path} \Rightarrow \text{LOW output}