Pipe Latch Unit Synchronization for DDR2 Data Output
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Solution Overview
Problem
DDR2 SDRAM devices face challenges in managing data output latency and collision prevention during successive command operations, where the activation of CAS signals and data output timing can lead to malfunctions if not properly synchronized.
Innovation Solution
A semiconductor device employing a pre-signal generator and data output portion that generates pre-latch pulse signals and shift clock signals to synchronize input and output control signals, ensuring that data are latched and outputted correctly, even when pre-input and pre-output control signals have varying generation times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If data are outputted from cell array blocks earlier than a predetermined CL, then data output speed is improved, but data collision occurs between multiple data bits
Solution Approach 1:
The patent introduces a pre-latch pulse signal generated in advance based on pre-input and pre-output control signals. This preliminary action allows the system to prepare latching operations before actual data arrival, enabling early data output from cell array blocks while maintaining proper synchronization to prevent data collisions through the pre-established latching mechanism
2Adaptability or versatility
If the time period between data output from memory cells and reaching the pipe latch unit varies, then operational flexibility is improved, but data output malfunction occurs
Solution Approach 1:
The patent employs feedback mechanisms where the pre-signal generator continuously monitors pre-input and pre-output control signals to dynamically adjust the pre-latch pulse timing. This feedback loop allows the system to adapt to varying time periods between data output and latching while maintaining correct data output through real-time synchronization adjustments
Solution Approach 2:
The system uses dynamic signal generation where the pre-latch pulse width and timing are not fixed but are determined by the actual timing relationship between pre-input and pre-output control signals. This dynamic adaptation enables the system to handle variable operational conditions while preventing data output malfunctions through real-time timing adjustment
Data Source
AI summary
The semiconductor device includes a pre-signal generator and a data output portion. The pre-signal generator generates a pre-input control signal and a pre-output control signal. The pre-signal generator also generates a pre-latch pulse signal by detecting when the pre-input control signal and the pre-output control signal are generated. The data output portion receives an input control signal, a latch pulse signal, and a first output control signal. The data output portion receives an input clock signal in response to the input control signal and the latch pulse signal to generate a shift clock signal, and the data output portion also shifts the first output control signal in response to the shift clock signal to generate a second output control signal.