1. A semiconductor memory device comprising:
a memory cell array composed by arranging memory cells containing data storage capacitors in a matrix;
a filter circuit that removes noise contained in an address signal provided from the outside;
a first signal transition detection circuit system that generates a first pulse signal for controlling refresh operation by detecting a change in an address signal prior to passing through the filter circuit;
a second signal transition detection circuit system that generates a second pulse signal for controlling readwrite operation by detecting a change in an address signal after passing through the filter circuit; and
a control system that sequentially performs the refresh operation and the readwrite operation within the same cycle by using the first and second pulse signals as triggers.
2. The semiconductor memory device according to claim 1, wherein the second signal transition detection circuit system controls the first signal transition detection circuit system in an inactive state by detecting a change in an address signal that has passed through the filter circuit.
3. The semiconductor memory device according to claim 1, wherein the control system controls the refresh operation based on the first pulse signal, and controls the readwrite operation based on the second pulse signal.
4. The semiconductor memory device according to claim 1, further comprising a row decoder circuit for selecting a row of the memory cell array,
wherein the control system is composed to include an address multiplexer that selects either a readwrite address signal generated from an address signal that has passed through the filter circuit or a refresh address signal generated in advance within the device based on the first and second pulse signals, and supplies a selected address signal to the row decoder circuit.
5. The semiconductor memory device according to claim 1, wherein the filter circuit is composed to include a delay circuit having a delay amount corresponding to the pulse width of presumed noise targeted for removal.
6. The semiconductor memory device according to claim 1, wherein the filter circuit is composed of a flip-flop that directly inputs the address signal from the outside.
7. The semiconductor memory device according to claim 1, wherein the filter circuit has characteristics that remove noise that causes an address signal provided from the outside to change to the H level in the case the address signal is at the L level.
8. The semiconductor memory device according to claim 1, wherein the second signal transition detection circuit system prohibits readwrite operation by the control system by detecting a change in an address signal that has passed through the filter circuit.
9. A control method of a semiconductor memory device comprising the steps of:
generating a first pulse signal for controlling refresh operation of a memory cell array composed by arranging memory cells containing data storage capacitors in a matrix by detecting a change in an address signal provided from outside the semiconductor memory device;
removing noise contained in the address signal provided from the outside;
generating a second pulse signal for controlling readwrite operation of the memory cell array by detecting a change in the address signal from which noise has been removed; and
sequentially performing the refresh operation and the readwrite operation within the same cycle by using the first and second pulse signals as triggers.
10. The control method of a semiconductor memory device according to claim 9, wherein the generation of the fist pulse signal is prohibited over a prescribed time period by detecting a change in the address signal from which noise has been removed.
11. The control method of a semiconductor memory device according to claim 9, wherein either a readwrite address signal generated from the address signal from which noise has been removed or a refresh address signal generated in advance within the semiconductor memory device is selected based on the first and second pulse signals, and a decoding operation is performed to select a row of the memory cell array.
12. The control method of a semiconductor memory device according to claim 9, wherein an operation is performed for removing noise contained in the address signal provided from the outside over period of time corresponding to the pulse width of presumed noise targeted for removal.
13. The control method of a semiconductor memory device according to claim 9, wherein noise is removed from an address signal input directly from outside the semiconductor memory device.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A seat for use in a vehicle, the seat comprising:
a seat base having a cushion and a seat back pivotably coupled to the seat base by a recliner mechanism, such that the seat back can be pivoted in a forward and rearward direction relative to the seat base;
a track assembly coupled to the vehicle and the seat that moves the seat in the forward and rearward directions relative to the vehicle,
a first electromechanical push button actuator located on the seat, the first actuator operable to actuate the seat such that the seat is moved from a use position to an easy entry position in which the seat back is tipped in a forward direction and the seat is slid forward on the track assembly;
a second actuator operable to actuate the seat such that the seat is moved from a use position to a fold flat position in which the seat back is folded forward and rests flat on a top surface of the cushion;
an energy storage device for storing energy generated from movement of the seat and selectively releasing stored energy to assist in repositioning the seat when at least one of the first and second actuators is actuated;
a force transmitting device having one end connected to the first actuator and a second end connected to the recliner mechanism, such that energizing the first actuator actuates the force transmitting device to release the recliner mechanism and move the seat from the use position to the easy entry position; and
an energy storage bypass mechanism that prevents release of stored energy from the energy storage device when the seat is occupied and enables release of stored energy from the energy storage device when the seat is not occupied.
2. The seat of claim 1, further comprising an emergency release handle that is operatively connected to the recliner mechanism, and disengages the recliner mechanism when pulled thereby enabling the seat to be adjusted.
3. The seat of claim 1, wherein the first actuator is activated remotely outside the vehicle using a key fob.
4. The seat of claim 1, wherein the energy storage bypass mechanism further comprises:
a housing;
a pivot member disposed within the housing and coupled to the energy storage device and having a central aperture, wherein the pivot member is pivotably coupled to the housing and the seat, and the energy storage device biases the pivot member in a predetermined direction;
a slide block member slidably disposed within the housing and having a first end and a second end, the first end having a surface for engagement with the pivot member;
a pinion member disposed within the housing and having a first end and a second end, the first end having a biasing member for coupling to the slide block member,
an interlock member disposed within the housing and having a first end and a second end, wherein the first end includes a surface for engagement with the pinion member and the second end includes a surface having a biasing member that biases the pinion member away from the slide block member such that the interlock member is in engagement with the slide block member when the seat is occupied, thereby enabling the energy stored in the energy storage device to be released upon actuation of at least one of the first actuator and the second actuator and the interlock member is disengaged from pinion member and the pinion member is disengaged from the slide block member when the seat is occupied, thereby preventing the slide block member from being disengaged from the pivot member and thereby preventing the energy stored in the energy storage device from being released upon actuation of at least one of the first actuator and the second actuator.
5. The seat of claim 1, further comprising:
a seat occupation detection system for regulating engagement and disengagement of the energy storage bypass mechanism.
6. The seat of claim 1, wherein the force transmitting device is a push-pull cable.
7. The seat of claim 1, further comprising a seat occupant detection system that detects the presence of an occupant in the seat and regulates engagement and disengagement of an energy storage bypass mechanism depending on whether the seat is occupied or unoccupied.
8. The seat of claim 7, wherein the seat occupant detection system includes a cable placed across a portion of the seat and is operatively engaged to the energy storage bypass mechanism, such that the weight of an occupant causes the cable to be pulled to deactivate the energy storage bypass mechanism and prevent disengagement of the recliner mechanism.
9. The seat of claim 8, wherein the cable is placed across a suspension surface of the seat base.
10. The seat of claim 1, wherein the first actuator is a linear motor, a rotary motor, or a solenoid.