ODT Latency Clock Control for Lower-Power Impedance Matching
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Solution Overview
Problem
High-speed semiconductor devices face impedance mismatching issues due to fluctuations in power voltage and temperature, leading to increased power consumption and data distortion, even when the on-die termination (ODT) latency clock generation circuit is unnecessary.
Innovation Solution
An ODT enable signal generator increases the enabling period of the ODT signal, generating ODT latency clocks only during the enabling period and disabling them during the disabling period, using a clock dividing circuit with D-flipflops and logic gates to control the ODT latency clock generator, reducing unnecessary power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ODT latency clock generation circuit operates continuously, then the ODT signal can be generated reliably, but power consumption increases unnecessarily
Solution Approach 1:
The patent implements periodic action by enabling the ODT latency clock generation circuit only during specific time periods when ODT operation is required. The control circuit generates enable signals that activate the clock generation circuit based on detected ODT signal conditions, rather than operating continuously. This ensures reliable ODT signal generation when needed while minimizing power consumption during periods when ODT is not required.
Solution Approach 2:
The patent applies dynamics by making the operation state of the ODT latency clock generation circuit changeable based on real-time conditions. The control circuit dynamically adjusts the operational state of the clock generation circuit by generating enable signals in response to ODT signal conditions, allowing the system to adapt between active and inactive states rather than maintaining a fixed continuous operation mode.
2Speed
If the swing width of interfaced signals is reduced to lessen delay, then communication speed improves, but impedance mismatching increases due to external noise and power voltage fluctuations
Solution Approach 1:
The patent implements feedback by using the ODT signal detected from the ODT pad as input to the control circuit. The control circuit monitors the ODT signal conditions and uses this feedback information to generate appropriate enable signals that activate the ODT latency clock generation circuit only when impedance matching is needed, thereby maintaining reliable impedance matching while enabling high-speed communication.
Data Source
AI summary
A semiconductor device includes an on-die termination (ODT) latency clock control circuit and an ODT circuit controlled by the ODT latency clock control circuit. The ODT latency clock control circuit includes an ODT enable signal generator receiving an ODT signal input through an ODT pad of the ODT circuit, and generating an ODT enable signal, and an ODT latency clock generator generating a plurality of ODT latency clocks in response to the ODT enable signal. The ODT enable signal includes an enabling period of a first logic level and a disabling period of a second and different logic level, and the ODT enable signal generator generates the ODT enable signal by increasing the width of the enabling period by a predetermined clock cycle and only generating the clocks during the increased enabling period.