ODT Signal Latency Switching for Stable High-Speed Memory I/O
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Solution Overview
Problem
Conventional semiconductor apparatuses face challenges in generating an on-die termination (ODT) signal that ensures stable data input/output operations as operation speeds increase, particularly due to the need for a preamble corresponding to 2 clock periods, which is difficult to achieve with existing timing configurations that require the external ODT signal to be inputted before the write command, leading to potential time loss and decreased channel efficiency.
Innovation Solution
An improved ODT signal generating circuit that includes a latency unit to delay the ODT signal by a predetermined time and an ODT control signal generating unit to provide either a first or second ODT signal based on a control signal, allowing for flexible timing adjustments between two operation modes, enabling the generation of a preamble corresponding to either a single or 2 clock periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the external ODT signal is inputted before the write command to generate a preamble, then the data input/output operation stability is improved, but the channel efficiency deteriorates due to time loss
Solution Approach 1:
The patent implements dynamic timing control by providing two different latency periods (first and second latency periods) that can be selectively applied based on operational requirements. The circuit dynamically switches between different delay configurations to balance stability and efficiency needs
Solution Approach 2:
The patent changes the timing parameters by introducing selectable latency periods. The first latency period enables preamble generation for stable operations, while the second (shorter) latency period improves channel efficiency by reducing time loss, allowing parameter optimization based on operational context
2Reliability
If a preamble corresponding to 2 clock periods is generated, then the data input/output operation stability is improved, but the timing configuration complexity increases
Solution Approach 1:
The patent segments the latency control into distinct selectable periods (first and second latency periods). This segmentation allows the complex timing requirement of 2 clock period preamble generation to be broken down into manageable, pre-configured latency options that can be selectively applied
Solution Approach 2:
The patent performs preliminary timing configuration by pre-establishing multiple latency period options in the circuit design. This preliminary action prepares the timing structure in advance, eliminating the need for complex real-time timing calculations and reducing operational complexity
3Device complexity
If the ODT signal is delayed by a fixed predetermined time, then the circuit simplicity is maintained, but the adaptability to different operation modes deteriorates
Solution Approach 1:
The patent transforms the fixed delay circuit into a dynamic one by introducing selectable latency periods. The circuit maintains relative simplicity while gaining adaptability through the ability to switch between first and second latency periods based on different operation modes
Solution Approach 2:
The patent creates a multi-functional latency unit that can serve different operation modes through its selectable latency periods. The same circuit structure adapts to different timing requirements, providing universal functionality without requiring entirely separate circuits for each mode
Data Source
AI summary
Various embodiments of an on-die termination (ODT) signal generating circuit are disclosed. In one exemplary embodiment, the ODT signal generating circuit includes a latency unit and an ODT control signal generating unit. The latency unit is configured to receive a clock signal and an ODT signal. The latency unit is configured to delay the ODT signal by a predetermined time to generate a first ODT signal. The latency unit is also configured to delay the ODT signal by less than the predetermined time to generate a second ODT signal. The ODT control signal generating unit is configured to provide either one of the first and second ODT signals as an ODT control signal in response to a control signal.