Abstract:
The present invention provides a semiconductor memory device having a plurality of STT-MRAM cells. The semiconductor memory device according to one embodiment of the present invention comprises: a cell array which includes at least one bank group, wherein each bank group includes a plurality of banks, wherein each bank includes a plurality of STT-MRAM cells; a source voltage generator which supplies voltage to source lines connected to the STT-MRAM cell; and a command decoder which decodes commands from the outside so as to perform read and write operations in the STT-MRAM cell, wherein the STT-MRAM cell includes an MTJ device having a free layer, a tunnel layer, and a pinned layer sequentially laminated, and a cell transistor, wherein a gate of the cell transistor is connected to a word line, wherein one electrode of the cell transistor is connected to a bit line through the MTJ device, wherein the other electrode of the cell transistor is connected to the source line.
Abstract:
A magnetic memory device, a memory module installing same and a memory system are disclosed. The magnetic memory device includes magnetic memory cells switching to one among at least two states according to a magnetization direction, and includes a mode register for supporting a plurality of operational options of the magnetic memory device. The memory module includes a module board, at leat one magnetic memory device chip installed on the module board, and a buffer chip installed on the module board for managing operation of the magnetic memory device chip. The memory system includes a memory controller communicating with the magnetic memory device and transceives electrophotic conversion signals or photoelectric conversion signals via an photocoupler coupled between the magnetic memory device and the memory controller.
Abstract:
An apparatus and a method for selecting a cell in a mobile communication terminal are provided to synchronize with a frequency, included in a PLMN which can not receive a service, and reduce the duplicate check of system information by using the BCCH(Broadcast Control Channel) allocation list of various communication networks, thereby reducing a cell selection time. A method for selecting a cell in a mobile communication terminal comprises the following steps of: checking whether a cell selection event is generated(400); searching for neighbor frequencies and the intensity of each frequency to generate a neighbor cell list(450) in which the frequencies are aligned in the order that the intensity of each frequency(RxLev) is higher(402); selecting a frequency to camp on in the order that the intensity of each frequency is higher(404); checking whether the selected frequency is a frequency included in a communication network which is not searched by using the AS(Already Searched) information of the neighbor cell list(406); synchronizing with the selected frequency if the selected frequency is a frequency which is not checked and searched(408); checking the system information of the selected frequency(410); checking whether the selected frequency is an available frequency included in a selected PLMN(Public Land Mobile Network)(412); and allowing the mobile communication terminal to enter an idle mode if the selected frequency is the available frequency included in the selected PLMN(416).
Abstract:
PURPOSE: A method for managing a sequence number for packet data transmission in updating the route between a network and a mobile terminal in GPRS(General Packet Radio Services) is provided to efficiently manage sequence numbers and to offer a simple message processing procedure. CONSTITUTION: If a route is updated(201), a network(20) transmits a routing area update accept message to a GMM(GPRS Mobility Management) layer(11) with the sequence number of the data packets transmitted/received through the previous route(203). The GMM layer(11) inputs the sequence number, contained in the routing area update accept message, to a sequence number table in accordance with a relevant NSAPI(Network Service Access Identifier)(205). Then the GMM layer(11) transmits a sequence number received message to inform an SM(Session Management) layer(13) that the sequence number has been received(207). The SM layer(13), receiving the sequence number received message, transmits the message to an SNDCP(SubNetwork Dependent Convergence Protocol) layer(15)(209). Receiving the sequence number received message, the SNDCP layer(15) searches the sequence number table for a necessary NSAPI sequence number and transmits the packet data of the next number of the searched sequence number to an LLC(Logical Link Control) layer(17)(211). The LLC layer(17), an RLC(Radio Link Control) layer(19), and a MAC(Media Access Control) layer(21) process the received packet data and transmits the processed data to the network(20) through an RF(Radio Frequency) part(23)(213).
Abstract:
PURPOSE: A method for managing a sequence number for packet data transmission in updating the route between a network and a mobile terminal in GPRS(General Packet Radio Services) is provided to efficiently manage sequence numbers and to offer a simple message processing procedure. CONSTITUTION: If a route is updated(201), a network(20) transmits a routing area update accept message to a GMM(GPRS Mobility Management) layer(11) with the sequence number of the data packets transmitted/received through the previous route(203). The GMM layer(11) inputs the sequence number, contained in the routing area update accept message, to a sequence number table in accordance with a relevant NSAPI(Network Service Access Identifier)(205). Then the GMM layer(11) transmits a sequence number received message to inform an SM(Session Management) layer(13) that the sequence number has been received(207). The SM layer(13), receiving the sequence number received message, transmits the message to an SNDCP(SubNetwork Dependent Convergence Protocol) layer(15)(209). Receiving the sequence number received message, the SNDCP layer(15) searches the sequence number table for a necessary NSAPI sequence number and transmits the packet data of the next number of the searched sequence number to an LLC(Logical Link Control) layer(17)(211). The LLC layer(17), an RLC(Radio Link Control) layer(19), and a MAC(Media Access Control) layer(21) process the received packet data and transmits the processed data to the network(20) through an RF(Radio Frequency) part(23)(213).
Abstract:
PURPOSE: A method for displaying the base synchronization status of a digital European cordless telephone system handset is provided to display status that a handset maintains synchronization with other base after losing synchronization with an appointed base, so that a user can recognize it through the handset. CONSTITUTION: A handset carries out standby status(310). The handset maintains synchronization with a registered base(312). The handset discriminates whether synchronization with the registered base is lost(314). In case that the handset loses synchronization, the handset detects the registration status of other bases(316). If the registration of other bases is detected(318), the handset searches a handset in the most adjacent distance(320). If the search is completed(322), the handset tunes synchronization to a searched base(324) and displays the intrinsic identifier of the searched base on the screen(326).
Abstract:
가. 청구범위에 기재된 발명이 속한 기술분야 전화기에 계산기 기능을 추가하는 기술에 관한 것이다. 나. 발명이 해결하려고 하는 기술적 과제 별도의 계산기를 갖지 않고 전화기로써 계산을 할 수 있도록 하여 편리성과 경제성을 높일 수 있는 전화기의 계산장치를 제공함에 있다. 다. 발명의 해결방법의 요지 표시부를 가지는 본 전화기의 계산장치는 계산 혹은 통화모드를 설정하는 키, 피연산자 및 연산자를 입력하는 다수의 키와 상기 전화기 고유의 기능에 필요한 키들을 물리적으로 공유하는 키패드와, 인입호를 검출하면 소정의 검출신호를 발생하는 인입호검출부와, 상기 검출신호에 응답하여 소정의 인터럽트신호를 발생하는 인터럽트컨트롤러와, 상기 키패드에서의 키 입력에 따라 계산 혹은 통화모드를 설정하고, 계산모드에서 피연산자 및 연산자에 대한 계산을 수행하여 상기 표시부에 표시한 후 통화모드로 절환하며, 임의의 시점에서 상기 인터럽트신호의 발생을 감지하면 그 즉시 계산모드를 해제하고 통화모드로 절환하는 마이크로프로세서를 가짐을 특징으로 한다. 라. 발명의 중요한 용도 전화기가 계산기 가능을 하게 하는 데 사용한다.