Selector circuit and processor system

A selector circuit comprising:

• a plurality of first selectors, each of the plurality of first selectors being configured to select one of a plurality of input signals on the basis of a first selection control signal and to output a first output signal corresponding to the selected input signal;
• and
• a second selector configured to perform a certain logical operation for the first output signals outputted from the plurality of first selectors and to output a second output signal corresponding to one of the first output signals on the basis of the logical operation,
• wherein each of the plurality of first selectors is configured to receive a second selection control signal indicating which of the plurality of first output signals the second selector outputs as the second output signal,
• wherein each of the plurality of first selectors includes:
• a first node capable of being charged and discharged,
• a charger configured to be provided between a first voltage source and the first node and to charge the first node by electrically connecting the first node to the first voltage source in a first period, the first period being defined by a timing control signal, and
• a discharge controller configured to be provided between the first node and a second voltage source having a potential lower than the first voltage source and to control, on the basis of the first selection control signal, the plurality of input signals, and the second selection control signal, whether to discharge the charged first node by electrically connecting the first node to the second voltage source in a second period, the second period following the first period, specified and being defined by the timing control signal.

A processor system comprising:

• a data register configured to hold a plurality of pieces of data;
• a selector configured to receive the pieces of data and to select and output one of the received pieces of data;
• an arithmetic unit configured to perform a certain arithmetic processing using the piece of data selected by the selector;
• and
• a controller configured to control a selection operation performed by the selector,
• wherein the selector includes
• a plurality of first selectors, each of the plurality of first selectors being configured to select one of a plurality of input signals on the basis of a first selection control signal and to output a first output signal corresponding to the selected input signal, and
• a second selector configured to perform a certain logical operation for the first output signals outputted from the plurality of first selectors and to output a second output signal corresponding to one of the first output signals on the basis of the logical operation,
• wherein each of the plurality of first selectors receives a second selection control signal indicating which of the first output signals the second selector outputs as the second output signal,
• wherein each of the plurality of first selectors includes:
• a first node capable of being charged and discharged,
• a charger configured to be provided between a first voltage source and the first node and to charge the first node by electrically connecting the first node to the first voltage source in a first period, the first period being defined by a timing control signal,
• a discharge controller configured to be provided between the first node and a second voltage source having a potential lower than the first voltage source and to control, on the basis of the first selection control signal, the plurality of input signals, and the second selection control signal, whether to discharge the charged first node by electrically connecting the first node to the second voltage source in a second period, the second period following the first period and being defined by the timing control signal, and
• an output circuit configured to output the first output signal having a potential according to a potential of the first node and to hold a potential of the charged first node when the discharge controller does not discharge the charged first node in the second period,
• wherein the controller generates the first selection control signal, the second selection control signal, and the timing control signal.