Abstract:
A stacked semiconductor device may have a plurality of chips stacked in three-dimension. The stacked semiconductor device may include a first semiconductor chip and at least one second semiconductor chip. The first semiconductor chip may include a plurality of first through silicon vias (TSVs). The at least one second semiconductor chip may include a plurality of second TSVs. The at least one second semiconductor chip may be stacked above the first semiconductor chip and may be thinner than the first semiconductor chip. Therefore, the stacked semiconductor device may have an improved reliability.
Abstract:
A multipath accessible semiconductor memory device provides an interface function between processors. The memory device may include a memory cell array having a shared memory area operationally coupled to two or more ports that are independently accessible by two or more processors, an access path forming unit to form a data access path between one of the ports and the shared memory area in response to external signals applied by the processors, and an interface unit having a semaphore area and mailbox areas accessible in the shared memory area by the two or more processors to provide an interface function for communication between the two or more processors.
Abstract:
Provided is a synchronous dynamic random access memory (DRAM) semiconductor device including multiple output buffers, a strobe control unit and multiple strobe buffers. Each of the output buffers is configured to output one bit of data. The strobe control unit is configured to output multiple strobe control signals in response to an externally input signal. The strobe buffers are connected to the output buffers and the strobe control unit, and each of the strobe buffers is configured to output at least one strobe signal. At least some of the strobe buffers are activated in response to the strobe control signals, and the output buffers are activated in response to the strobe signals output by the activated strobe buffers.
Abstract:
A semiconductor memory device is disclosed. The semiconductor device includes a memory cell array, a clock signal generator configured to receive an external clock signal from the outside of the memory device and output an internal clock signal, and a data output unit configured to receive an internal data signal from the memory cell array and output a read data signal in response to the internal clock signal. The semiconductor memory device also includes a read data strobe unit configured to output a read data strobe signal having a cycle time of n times (n is an integer equal to or more than 2) a cycle time of the internal clock signal, based on the internal clock signal.
Abstract:
A multiport semiconductor memory device includes; first and second port units respectively coupled to first and second processors, first and second dedicated memory area accessed by first and second processors, respectively and implemented using DRAM cells, a shared memory area commonly accessed by the first and second processors via respective first and second port units and implemented using memory cells different from the DRAM cells implementing the first and second dedicated memory areas, and a port connection control unit controlling data path configuration between the shared memory area and the first and second port units to enable data communication between the first and second processors through the shared memory area.
Abstract:
An auto-precharge control circuit in a semiconductor memory and method thereof, where the auto-precharge starting point may vary. The auto-precharge starting point may vary in response to at least one control signal. The auto-precharge starting point may vary in accordance with frequency and/or latency information. The auto-precharge starting point may vary in response to at least one control signal including clock frequency information. The auto-precharge starting point may vary depending on a latency signal received from a mode register setting command.
Abstract:
A compatible optical pickup device includes a single light source to emit a light having a wavelength longer than 650 nm, an objective lens having a near axis area, a ring type annular lens area, and a far axis area to focus the light to form light spots suitable for a first relatively thin optical disk and a second relatively thick optical disk to form a first light spot having an FWHM (full width at half maximum) of 0.72 μm or less for the first optical disk and a second light spot having an FWHM of 0.8 μm or more for the second optical disk, an optical path changer to change a proceeding path of incident light, and a photodetector to receive light reflected by the optical disk and having passed through the objective lens and the optical path changer and to detect an information signal and/or an error signal.
Abstract:
An optical reading and writing system including a base; an optical disk rotatably mounted on the base; an optical pickup including an objective lens, focusing a light beam to form a light spot on a recording surface of the optical disk; an actuator arm mounted on the base such that the actuator arm can pivot in the radial direction of the optical disk by a voice coil motor; a load beam supported by the actuator arm, and capable of moving slightly up and down and in the radial direction of the optical disk by an external force; a flexure attached to the load beam, supporting a slider to enable the slider to contact the recording surface; and a driving unit mounted on free ends of the actuator arm and the load beam, providing a driving force in the radial direction to the free end of the load beam.