Configurable I/O Driver-Receiver for Termination and Reflection Control
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Solution Overview
Problem
Current chip-to-chip interconnects face limitations in speed and power due to issues with termination resistance in I/O drivers, which create significant current loads or lack thereof, restricting electrical interface speeds and signal integrity.
Innovation Solution
A configurable multi-dimensional driver and receiver system that includes circuits with adjustable termination resistance, equalization, and reflection cancellation capabilities, allowing for dynamic configuration of termination resistance, signal emphasis, and reflection control through delayed clocking and signal sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If termination resistance is included in the I/O driver circuit, then signal integrity is improved, but power consumption increases due to significant current load
Solution Approach 1:
The patent implements dynamic termination resistance control where the termination resistance value is adjusted based on operating conditions such as signal speed and power consumption requirements. The system can switch between different termination states (e.g., matched termination, open circuit, or high impedance) to optimize the trade-off between signal integrity and power consumption for different operating modes.
Solution Approach 2:
The invention changes the termination resistance parameter dynamically rather than using a fixed value. By adjusting the termination resistance parameter according to operating conditions, the system achieves optimal signal integrity when needed while minimizing power consumption during normal operation, thus resolving the contradiction between these two parameters.
2Use of energy by moving object
If termination resistance is not included in the I/O driver circuit, then power consumption is reduced, but signal integrity deteriorates due to reflections and speed limitations
Solution Approach 1:
The system dynamically adjusts termination resistance based on operating conditions. When high signal integrity is required (e.g., at higher speeds or during critical data transmission), the termination resistance is activated or adjusted to appropriate values. During normal operation where power efficiency is prioritized, the termination can be reduced or disabled, thus resolving the contradiction between power consumption and signal integrity.
Solution Approach 2:
The patent applies preliminary anti-action by pre-configuring multiple termination resistance values and selecting the appropriate one before signal transmission based on predicted or measured conditions. This prevents signal integrity issues from occurring in the first place while avoiding unnecessary power consumption, rather than reacting to problems after they arise.
3Speed
If I/O interface speed is increased, then data throughput is improved, but signal reflections and interference increase
Solution Approach 1:
The patent implements dynamic adjustment of termination resistance that responds to signal speed changes. As interface speed increases, the system automatically adjusts termination parameters to maintain signal quality. This dynamic adaptation allows the system to achieve higher data throughput while maintaining acceptable signal integrity through real-time parameter optimization.
Solution Approach 2:
The invention employs feedback mechanisms where signal quality metrics are monitored and used to adjust termination resistance settings. When interface speed increases cause reflections or interference, the feedback loop detects degradation and adjusts termination parameters accordingly, enabling the system to maintain signal quality across a range of operating speeds.
Data Source
AI summary
Embodiments of the invention are generally directed to a configurable multi-mode driver and receiver. An embodiment of a communication system includes a communication channel, and a first device and a second device coupled with the communication channel. The first device includes a driver apparatus to drive data signals on the communication channel, the driver apparatus including circuits to receive and drive the data signals, where the circuits are configurable for termination resistance of the driver circuit apparatus, and each of the plurality of circuits is comprised of one or more circuit units, the circuit units being configurable for equalization control of the driver apparatus. The second device includes a receiver to receive data signals from the communication channel as an input. Either the first device or the second device includes configurable circuit elements to provide signal reflection control for the system.