Abstract:
Method and apparatus for use with multi-bank Synchronous Dynamic Random Access Memory (SDRAM) circuits, modules, and memory systems are disclosed. In one described embodiment, an SDRAM circuit receives a bank address to be used in an auto-refresh operation, and performs the auto-refresh operation on the specified bank and for a current refresh row. The device is allowed to enter a self-refresh mode before auto-refresh operations have been completed for all banks and the current refresh row. The memory device completes refresh operations for the current refresh row before proceeding to perform self-refresh operations for new rows. Other embodiments are described and claimed.
Abstract:
A semiconductor memory device having a partial activation framework, which provides an efficient page mode operation while operating in a partial activation mode. Control circuits and methods are provided to enable a page mode operation (for read and write data accesses) in a semiconductor memory device (such as a DRAM, FCRAM) having a partial activation framework, resulting in an improved data access speed when data is written/read from memory locations having the same wordline address. In one aspect, a method for accessing data in a memory device comprises activating a first wordline corresponding to a first address to perform a data access operation, receiving a second address after the first address, if the second address is the same as the first address, generating a page mode enable signal for maintaining an activated state of the first wordline corresponding to the first address while activating a second wordline corresponding to the second address, and deactivating the first and second wordlines in response to disabling of the page mode enable signal.
Abstract:
A semiconductor memory device includes first and second isolation transistors for electrically connecting/isolating a pair of bitlines to/from a sense amplifier circuit, and a MOS transistor having a source region that is shared with one of sources of the first and second isolation transistors. The MOS transistor may be used as a bitline boosting capacitor.
Abstract:
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)
Abstract:
Provided is a memory device having a first switch configured to receive a first CSL signal to input or output data. A second switch is configured to receive a second CSL signal. A sensing and latch circuit (SLC) is coupled between the first and second switches. And at least one memory cell is coupled to the second switch. The second switch is configured to control timing of read or write operations of the at least one memory cell in response to the second CSL signal, e.g., where a read operation can be performed in not more than about 5 ns. The SLC operates as a latch in a write mode and as an amplifier in a read mode. The memory device may comprise part of a memory system or other apparatus including such memory device or system. Methods of performing read and write operations using such memory device are also provided.
Abstract:
Method pertains to a medical imaging device for simultaneously detecting fluorescence and Raman signals for multiple fluorescence and Raman signal targets. The method includes: injecting at least one marker particle including Raman markers and receptors into the body of an animal, which can be a human; irradiating a laser beam onto the body of the animal; and detecting the optical signals emitted by the marker particle after the irradiation of the laser beam separately as fluorescence signals and Raman signals. The simultaneous detection of multiple targets may be performed even without scanning optical signals emitted by the marker particle individually with different optical fibers. As an examination may be performed by injecting surface-enhanced Raman marker particles, into which fluorescent components are introduced, into the body of the animal using a spray or the like, weak Raman signals may be augmented so as to obtain a more accurate diagnosis result in real time.
Abstract:
A stress detection circuit includes a function block and a detection signal generation circuit. The function block outputs a first voltage such that the first voltage is varied depending on an extent that the function block is stressed. The detection signal generation circuit generates a stress detection signal based on the first voltage and a second voltage during a test mode. The stress detection signal represents integration of the function block, and a level of the second voltage corresponds to a level of the first voltage before the function block is stressed.
Abstract:
A memory cell array with open bit line structure includes a first sub memory cell array, a second sub memory cell array, a sense-amplifier/precharge circuit, first capacitors and second capacitors. The first sub memory cell array is activated in response to a first word line enable signal, and the second sub memory cell array is activated in response to a second word line enable signal. The sense-amplifier/precharge circuit is connected to the first sub memory cell array through first bit lines and to the second sub memory cell array through second bit lines, and the sense-amplifier/precharge circuit precharges the first bit lines and the second bit lines and amplifies data provided from the first sub memory cell array and the second sub memory cell array.
Abstract:
A semiconductor memory device, having a test mode and a normal mode, includes a frequency multiplier and a test command sequence generator. The frequency multiplier receives a test clock signal in the test mode and generates multiple internal test clock signals, each of which has a frequency equal to a frequency of an operation clock signal in the normal mode. The test clock signal has a frequency lower than the frequency of the operation clock signal. The test command sequence generator generates at least one command signal in response to the internal test clock signals in the test mode. The at least one command signal corresponds to at least one operation timing parameter of the semiconductor memory device that is to be measured. The frequency multiplier may include a Phase Locked Loop (PLL) or a Delay Locked Loop (DLL).
Abstract:
A semiconductor memory device may include a memory cell array, a redundancy address decoder, a defective address detection unit, and a defective address program unit. The memory cell array includes a plurality of memory cell groups and a predetermined number of redundancy memory cell groups. The redundancy address decoder includes a predetermined number of redundancy decoders for accessing at least one group of the redundancy memory cell groups when a first defective address is identical to an externally applied address. The defective address detection unit performs a write operation and a read operation on the memory cell array during a test operation to detect a defective address, and outputs the detected defective address as the first defective address when the same defective address is detected a predetermined number of times or more. The defective address program unit receives and programs the first defective address output from the defective address detection unit during a program operation.