DDR Receiver Clock Delay Buffering for Stable Data Timing
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Solution Overview
Problem
High-speed semiconductor systems require improved data processing capabilities beyond single data rate (SDR) synchronous devices, necessitating double data rate (DDR) synchronous semiconductor devices that can operate at higher speeds without increasing external clock signal frequency.
Innovation Solution
A semiconductor system comprising a transmitter and receiver, where the receiver generates internal clock signals with phase differences and uses buffers and delay units, including inverter chains, to buffer and retard data signals, enabling efficient data input and output synchronization with multiple clock phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DDR synchronous semiconductor devices are used to operate at higher speeds, then data processing capability is improved, but timing synchronization becomes more difficult to control
Solution Approach 1:
The patent applies preliminary action by generating delayed versions of internal clock signals in advance before data reception. The receiver generates first and second delayed internal clock signals by retarding the internal clock signal through delay units, ensuring that timing synchronization is prepared beforehand for high-speed DDR operation. This allows the system to maintain precise timing control despite the increased data processing capability of DDR devices.
2Productivity
If delay periods are reduced to increase operation speed, then productivity is improved, but signal stability deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully controlling and optimizing delay periods as a critical parameter. The delay units are designed to provide specific delay periods that are sufficient to maintain signal stability even at high operation speeds. The receiver adjusts the delay periods of internal clock signals to ensure stable data reception while operating at increased speeds, balancing the trade-off between productivity and signal stability.
3Productivity
If multiple clock phases are used for DDR operation, then data throughput is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the clock signal management into distinct functional units. The receiver includes separate delay units for generating first and second delayed internal clock signals, and separate buffering units for handling data at different clock phases. This segmentation allows DDR operation with multiple clock phases while managing complexity through modular design, where each unit handles a specific aspect of the timing and data reception process.
Data Source
AI summary
The receiver includes a first buffer configured to buffer a data to generate a first internal data, a first delay unit configured to retard the first internal clock signal by a first delay period to generate a first delayed internal clock signal, and a second buffer configured to buffer the first internal data to generate a first input data.