Abstract:
In one example embodiment, a memory system includes a memory module and a memory controller. The memory module is configured generate density information of the memory module based on a number of the bad pages of the memory module, the bad pages being pages that have a fault. The memory controller is configured to map a continuous physical address to a dynamic random access memory (dram) address of the memory module based on the density information received from the memory module.
Abstract:
Provided is a refresh method of a volatile memory device. The method includes: detecting a number of disturbances that affect a second memory area as the number of accesses to a first memory area is increased; outputting an alert signal from the volatile memory device to an outside of the volatile memory device when the detected number of disturbances reach a reference value; and performing a refresh operation on the second memory area in response to the alert signal.
Abstract:
A memory device including a memory cell array region, includes, column selection signal lines formed in a first column conduction layer of the memory cell array region and extending in a column direction, global input-output data lines formed in a second column conduction layer of the memory cell array region different from the first column conduction layer and extending in the column direction and power lines formed in a shield conduction layer of the memory cell array region between the first column conduction layer and the second column conduction layer. The noises in the signal lines and the power lines may be reduced and performance of the memory device may be enhanced by forming the column selection signal lines and the global input-output data lines in different column conduction layers and forming the power lines in the shield conduction layer between the column conduction layers.
Abstract:
A method of operating a volatile memory device includes storing address information of weak cell rows. According to some examples, after writing to a weak cell row, a refresh operation is performed on the weak cell row within a predetermined time. According to some examples, the writing operation to a weak cell row may be performed with a longer write recovery time than a write recovery time to normal cell rows.
Abstract:
A semiconductor memory device may include a plurality of data input/output DQ pads and a plurality of first and second memory cell arrays. Each path of a first set of data paths from each of the plurality of first memory cell arrays to a corresponding DQ pad is physically shorter than each path of a second set of data paths from each of the plurality of second memory cell arrays to the corresponding DQ pad. Each of the plurality of first memory cell arrays is a designated first-speed access cell array and each of the plurality of second memory cell arrays is a designated second-speed access cell array, the second-speed being slower than the first-speed. A size of the each of the plurality of first memory cell arrays is smaller than a size of the each of the plurality of second memory cell arrays.