Samsung Electronics Co., Ltd.

Dong-seok Kang

Chul-woo Park

Sang-beom Kang

Yun-sang Lee

Dong-hyun Sohn

Hye-Jin Kim

Chan-Kyung Kim

Soo-Ho Cha

Hyung-Rok Oh

Hyung-rock Oh

Chankyung Kim

Yunsang Lee

A magnetic random access memory (MRAM), and a memory module, memory system including the same, and method for controlling the same are disclosed. The MRAM includes magnetic memory cells configured to change between at least two states according to a magnetization direction, and a mode register supporting a plurality of operational modes.

Spin transfer torque magnetic random access memory for supporting operational modes with mode register

Disclosed is a current sense amplifier suitable for a nonvolatile memory device such as a magnetic random access memory. In the current sense amplifier, a reference memory cell for sensing is implemented by a memory cell equal to a normal memory cell without fabricating different reference memory cells. The current sense amplifier is formed of first and second cross coupled differential amplifiers being covalent bonded. The current sense amplifier compares a current flowing to a sensing node of a memory cell directly with currents flowing to reference sensing nodes.

Current sense amplifying circuit in semiconductor memory device

A semiconductor memory device includes a cell array including one or more bank groups, where each of the one or more bank groups includes a plurality of banks and each of the plurality of banks includes a plurality of spin transfer torque magneto resistive random access memory (STT-MRAM) cells. The semiconductor memory device further includes a source voltage generating unit for applying a voltage to a source line connected to the each of the plurality of STT-MRAM cells, and a command decoder for decoding a command from an external source in order to perform read and write operations on the plurality of STT-MRAM cells. The command includes a combination of at least one signal of a row address strobe (RAS), a column address strobe (CAS), a chip selecting signal (CS), a write enable signal (WE), and a clock enable signal (CKE).

Semiconductor memory devices for alternately selecting bit lines

A semiconductor memory device includes a memory cell array, a mode register set and a test circuit. The memory cell array includes a plurality of wordlines, a plurality of bitlines, and a plurality of spin-transfer torque magneto-resistive random access memory (STT-MRAM) cells, and each STT-MRAM cell disposed in a cross area of each wordline and bitline, and the STT-MRAM cell includes a magnetic tunnel junction (MTJ) element and a cell transistor. A gate of the cell transistor is coupled to a wordline, a first electrode of the cell transistor is coupled to a bitline via the MTJ element, and a second electrode of the cell transistor is coupled to a source line. The mode register set is configured to set a test mode, and the test circuit is configured to perform a test operation by using the mode register set.

Semiconductor memory device having resistive memory cells and method of testing the same

There are provided an apparatus and a method of managing short message service (SMS) messages related to the settlement of payments using a hand-held phone. The apparatus includes a message receiver, a settlement-related SMS message manager, and a message displayer. The message receiver receives and stores SMS messages. The settlement-related SMS message manager searches settlement-related SMS messages of the SMS messages based on attribute data of the SMS messages to create settlement-related statistical data. The message displayer displays the settlement-related statistical data to the outside. Users can conveniently manage data on payments to be settled and receives statistically analyzed settlement-related data as settlement-related SMS messages can be managed in a HHP.

Apparatus and method for managing SMS messages in HHP

A digital contents superdistribution and transmittance method through the digital contents download services including accessing a server providing digital contents download services via a communication network to make payment for digital contents on the server, and receiving a download of the digital contents on which a security code is set; distributing the downloaded digital contents for which payment has been made to another user; executing the digital contents on the another user's computer, and accessing the server automatically via a communication network; and if the server is accessed and payment is made for the digital contents by the another user, offering a predetermined compensation to the user that has received the download. Accordingly, those who properly receive a download of digital contents can re-distribute the digital contents, and digital contents distribution can be promoted by offering a predetermined portion of profits resulting from the distribution. Furthermore, compatibility with the conventional distribution mechanism for encrypted digital contents can be achieved.

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Seoul, South Korea

Dong-seok Kang