Crossbar switch with an arrangement of wires, logic integrated circuit using the same, and semiconductor device
A crossbar switch includes a plurality of first wires extending in a first direction and second wires extending in a second direction. The switch includes third wires extending in a third direction and fourth wires extending in a fourth direction. The switch includes switch cells connected to the first and second wires. The first wires are skewed relative to the second and fourth wires, while the third wires are skewed relative to the second and fourth wires. The switch cells are connected to the third and fourth wires, and the third wires are also connected to the switch cells connected to the first wires adjacent to the respective first wires, or alternatively the fourth wires are also connected to the switch cells connected to the second wires adjacent to the respective second wires.
1. A crossbar switch including:
a plurality of first wires extending in a first direction;
a plurality of second wires extending in a second direction;
a plurality of third wires extending in a third direction parallel to the first direction;
a plurality of fourth wires extending in a fourth direction; and
a plurality of switch cells connected to the first wires and the second wires, in which
the first wires are skew relative to the second wires and the fourth wires,
the third wires are skew relative to the second wires and the fourth wires,
the switch cells are connected to the third wires and the fourth wires and are entirely between the third wires, and
wherein at least two adjacent switch cells directly connected to the same third wire are directly connected to the different first wires.
2. The crossbar switch according to claim 1 , in which
each of the switch cells includes a first switch, a second switch, and a transistor,
each of the first switch and the second switch includes a resistive switching layer and two electrodes that sandwiches the resistive switching layer therebetween,
one of the electrodes of the first switch and one of the electrodes of the second switch are connected,
one of a source and a drain of the transistor is connected to the connection between the electrodes,
the other of the electrodes of the first switch is connected to each of the first wires,
the other of the electrodes of the second switch is connected to each of the second wires,
a gate of the transistor is connected to each of the third wires, and
the other of the source and the drain of the transistor is connected to each of the fourth wires.
3. The crossbar switch according to claim 1 , in which
the first direction and the third direction are parallel, and the second direction and the fourth direction are parallel.
4. The crossbar switch according to claim 1 , in which
the first direction and the second direction are perpendicular, and the third direction and the fourth direction are perpendicular.
5. The crossbar switch according to claim 1 , in which
the number of the switch cells is smaller than the number of cross-points between the first wires and the second wires.
6. The crossbar switch according to claim 2 , in which
an arranging direction of the first switch and the second switch is parallel to the third direction or the fourth direction.
7. The crossbar switch according to claim 2 , in which
the first switch and the second switch are bipolar-type resistive switching elements, and are connected such that polarities of the resistive switching elements are opposed to each other.
8. A logic integrated circuit including the crossbar switch according to claim 1 .
9. The logic integrated circuit according to claim 8 including a plurality of the crossbar switches whose ratios of the number of the switch cells to the number of the cross-points between the first wires and the second wires are different.
10. A semiconductor device including the logic integrated circuit according to claim 8 .