Semiconductor memory device and memory system for improving bus efficiency

Abstract

Disclosed is a memory device, comprising a memory controller, a clock input pin for receiving a clock signal, a first chip selection signal input pin for receiving a first chip selection signal for a row address strobe from the memory controller, a second chip selection signal input pin for receiving a second chip selection signal for a column address strobe from the memory controller, a row command input pin for receiving a row command from the memory controller, a column command input pin for receiving a column command from the memory controller, a plurality of row address input pins for receiving row addresses from the memory controller, and a plurality of column address input pins for receiving column addresses from the memory controller.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to a semiconductor memory device and a memory system, and more particularly, to a semiconductor memory device and a memory system for improving bus efficiency.[0003] 2. Description of the Related Art[0004] Memory devices are typically developed to have a high density of integration and large capacity. Central processing units (CPU) are developed to achieve processing at high speed. The operating speed of large memory devices is usually slower than the speed of the CPUs. As a result, there arises a gap between the operating speeds of CPUs and memory devices. The slower operating speeds of memory devices restrict the overall performance of computer systems. In order to achieve speedy memory systems, high-speed memory devices must be developed and the bus efficiency thereof improved.[0005] Synchronous DRAMs are among the fastest large-scale memory devices.[0006] However, in synchronous DRAMs, in order to reduce the nu...

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