Abstract:
PURPOSE: A semiconductor memory device is provided to reduce the power consumption without malfunction by blocking the clock applied to the FIFO register. CONSTITUTION: A clock generator(72) generates a plurality of transmission clocks. The clock generator generates a plurality of sampling clocks respectively having delay time differences. A FIFO register(75) stores the internal read signal in response to one or more sampling clock out of the plurality of sampling clocks.
Abstract:
A semiconductor memory device and a method for implementing an SPA(Single Pumped Address) mode thereof are provided to evaluate internal margin between commands accurately by reducing operation cycle time(tCC) of a clock signal. According to a DPA(Dual Pumped Address) type semiconductor memory device where one external address is applied as being divided to correspond to two continuous operation cycles of a clock signal, an internal address generation circuit enables to maintain a first internal command and a second internal command corresponding to a second external command as one operation clock cycle in a test mode, by outputting a first internal address and the first internal command corresponding to a first external address and a first external command respectively during an operation cycle next to a second operation cycle of two continuous operation cycles of the clock signal to apply the first external address, when the first external address and the first external command are applied and the second external address and the second external command are applied.
Abstract:
A circuit and a method for sampling a valid command by using an extended valid address window for high speed operation in a double pumped address scheme memory device are provided to easily assure the margin between with a decoded internal command signal to latch extended first and second internal address signals, by enabling the valid window of the extended first and second internal address signals to assure at least two periods of the valid window. A valid command signal generation part receives command signals in response to a clock signal and then generates a valid command signal. An address buffer sequentially receives first and second address signals in response to the clock signal and generates first and second internal address signals from the first and second address signals, and generates extended first and second internal address signals in response to the valid command signal. A command buffer generates internal command signals from command signals in response to the clock signal, and generates an internal clock signal by delaying the clock signal. An address latch circuit generates a decoded internal command signal by decoding the internal command signals in response to the internal clock signal, and latches and decodes the extended first and second internal address signals in response to the decoded internal command signal.
Abstract:
복수개의 트랜지스터를 순차적으로 턴온시킴으로써 동시적 스위칭 노이즈를 저감시키는 구성을 갖는 데이터 출력 드라이버가 개시된다. 본 발명에 따른 데이터 출력 드라이버는 차단 제어부, 연결 제어부 및 출력 구동부를 구비하는 것을 특징으로 한다. 상기 차단 제어부는 각각 내부 데이터의 논리 레벨에 대응하는 차단 제어 신호를 동시적으로 출력하는 복수개의 병렬 트랜지스터들을 구비한다. 상기 연결 제어부는 각각 내부 데이터의 논리 레벨에 대응하는 연결 제어 신호를 순차적으로 출력하는 복수개의 직렬 트랜지스터들을 구비한다. 상기 출력 구동부는 차단 제어 신호에 응답하여 동시적으로 턴오프(Turn off)됨으로써 구동 전압원과 출력 패드를 동시적으로 차단시키거나, 연결 제어 신호에 응답하여 순차적으로 턴온(Turn on)됨으로써 구동 전압원과 출력 패드를 순차적으로 연결시키는 복수개의 구동 트랜지스터들을 구비한다. 본 발명에 의하면 급격한 전류 상승을 억제함으로써, 동시적 스위칭 노이즈(SSN)와 이웃하는 데이터 전송 경로 간의 상호 간섭(ISI)을 저감시킬 수 있는 효과가 있다. 데이터 출력 드라이버, 동시적 스위칭 노이즈, 순차적 턴온
Abstract:
수신인터페이스회로는, 터미네이션제어신호에응답하여터미네이션모드를변경하는터미네이션회로, 버퍼제어신호에응답하여수신특성을변경하는버퍼블록및 상기터미네이션모드의변경에연동하여상기버퍼블록의상기수신특성이변경되도록상기터미네이션제어신호및 상기버퍼제어신호를발생하는인터페이스컨트롤러를포함한다. 수신인터페이스회로는터미네이션모드에연동하여수신특성을변경함으로써다양한통신규격들을지원할수 있다. 이러한수신인터페이스회로를이용하여메모리시스템과같은송수신시스템의통신효율을증가시키고송신장치와수신장치사이의호환성을향상시킬수 있다.