Semiconductor integrated circuit
AssigneeKabushiki Kaisha Toshiba
InventorMasaru Koyanagi
Life of this patent
Estimating the term…
Abstract
A semiconductor integrated circuit is operative in a plurality of different modes. A plurality of select signals whose number corresponds to modes selected from a plurality of different modes are outputted. In response to the select signals, it is detected whether at least two operation modes are selected simultaneously. If so, a detection signal is outputted. In response to this detection signal, the operation of the semiconductor integrated circuit is stopped. Further, in response to the select signal, the semiconductor integrated circuit is activated in a mode by means of a predetermined select signal of these select signals. Further, in response to these select signals, the selected mode can be detected.
Claims19
A semiconductor integrated circuit operative in a plurality of different modes, the semiconductor integrated circuit comprising:
- a plurality of input terminals;
- a plurality of resistive devices each connected between a corresponding one of the input terminals and a reference terminal to which a reference potential of the semiconductor integrated circuit is applied;
- a plurality of logic circuits each connected to a corresponding one of the input terminals and the resistive devices, each logic circuit generating a mode selection signal corresponding to one of the different modes when a predetermined potential is applied to one of the logic circuits from a corresponding one of the input terminals, the semiconductor integrated circuit thereby operating in a mode corresponding to the mode selection signal, and wherein a resistance of each resistive device is high enough such that an application of the predetermined potential to the one of the input terminals causes a voltage level of the one of the input terminals to be higher than a threshold voltage of the one of the logic circuits;
- detecting means, connected to the plurality of logic circuits, for generating a mode stop signal when at least two mode selection signals are simultaneously generated;
- and
- operation stopping means, operating in response to the mode stop signal, for stopping the operation of the semiconductor integrated circuit.
A semiconductor integrated circuit operative in a plurality of different modes, the semiconductor integrated circuit comprising:
- a plurality of input terminals;
- a plurality of resistive devices each connected between a corresponding one of the input terminals and a reference terminal to which a reference potential of the semiconductor integrated circuit is applied;
- a plurality of logic circuits each connected to a corresponding one of the input terminals and the resistive devices, each logic circuit generating a mode selection signal corresponding to one of the different modes when a predetermined potential is applied to one of the logic circuits from a corresponding one of the input terminals, and wherein a resistance of each resistive device is high enough such that an application of the predetermined potential to the one of the input terminals causes a voltage level of the one of the input terminals to be higher than a threshold voltage of the one of the logic circuits;
- and
- mode selection means for selecting one mode selection signal when at least two mode selection signals are generated, the semiconductor integrated circuit thereby operating in a mode corresponding to the selected mode selection signal.
A semiconductor integrated circuit operative in a plurality of different modes, the semiconductor integrated circuit comprising:
- a plurality of input terminals;
- a plurality of resistive devices each connected between a corresponding one of the input terminals and a reference terminal to which a reference potential of the semiconductor integrated circuit is applied;
- a plurality of logic circuits, an input of each logic circuit connected to a corresponding one of the input terminals and to a corresponding one of the resistive devices, each logic circuit generating a mode selection signal corresponding to one of the different modes when a predetermined potential is applied from a corresponding one of the input terminals, the semiconductor integrated circuit thereby operating in a mode corresponding to the mode selection signal, and wherein a resistance of each resistive device is high enough such that an application of the predetermined potential to one of the input terminals of one of the logic circuits causes a voltage level of the one of the input terminals to be higher than a threshold voltage of the one of the logic circuits;
- current generating means, operative in response to the mode selection signal, for generating a current corresponding to the mode selection signal;
- and
- at least one observation terminal connected to the current generating means, the mode selection signal thereby being observable as a current at the observation terminal.
Dependencies are inferred from the claim text.