Semiconductor device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorYasuhiko TAKEMURA
Life of this patent
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Abstract
[Object] A novel programmable logic device is provided. [Solution] Programmable switches each include a first transistor and a second transistor. The first transistor in a first programmable switch controls conduction between a first wiring and a gate of the second transistor in the first programmable switch. The second transistor in the first programmable switch controls conduction between the first wiring and a second wiring. The first transistor in the second programmable switch controls conduction between another first wiring and a gate of the second transistor in the second programmable switch.
Claims14
A semiconductor device characterized by comprising:
- a first wiring;
- a second wiring;
- a third wiring;
- a fourth wiring;
- a first switch;
- a second switch;
- a third switch;
- and
- a fourth switch,
- wherein the first switch has a function of controlling conduction between the first wiring and a control terminal of the second switch,
- wherein the second switch has a function of controlling conduction between the second wiring and the fourth wiring,
- wherein the third switch has a function of controlling conduction between the second wiring and a control terminal of the fourth switch,
- wherein the fourth switch has a function of controlling conduction between the third wiring and the fourth wiring,
- wherein a first signal is supplied to the first wiring and the second wiring in a first period,
- wherein a second signal is supplied to the second wiring and the third wiring in a second period,
- wherein the third wiring and the fourth wiring are held at a constant potential determined independent of the first signal in the first period,
- wherein the first switch and the third switch are in an on state in the first period, and
- wherein the first switch and the third switch are in an off state in the second period.
A semiconductor device characterized by comprising:
- a plurality of first programmable logic elements;
- a second programmable logic element;
- a plurality of first wirings;
- a second wiring;
- and
- a plurality of circuits corresponding to the respective plurality of first wirings,
- wherein a first signal is supplied to each of the plurality of first wirings in a first period,
- wherein each of the plurality of first wirings is electrically connected to corresponding one of output terminals of the plurality of first programmable logic elements in a second period,
- wherein the second wiring is electrically connected to an input terminal of the second programmable logic element,
- wherein the plurality of circuits each includes at least a first switch, a second switch, and a third switch,
- wherein the third switch has a function of controlling conduction between one of the plurality of first wirings and one terminal of the second switch,
- wherein the second switch has a function of being selected to be in a conducting state or a non-conducting state depending on the first signal supplied from one of the plurality of first wirings through the first switch,
- wherein the second switch has a function of controlling conduction between the second wiring and one terminal of the third switch,
- wherein in the first period, the second wiring is held at a constant potential independent of the first signal and the third switch is in an off state, and
- wherein in the second period, the first switch is in an off state and the third switch is in an on state.
Dependencies are inferred from the claim text.