DDR5 Register Clock Driver Power Reduction via Unused Port Control
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Solution Overview
Problem
The existing DDR5 RCD proposals face significant power consumption issues due to high numbers of simultaneous switching signals, with half the signals being high and half being low, resulting in constant and high power usage across various modes of operation.
Innovation Solution
The proposed solution involves a register clock driver (RCD) with two output ports for each input channel, allowing for a default and non-default mode of operation, where unused signaling is kept high, reducing power usage by eliminating the need for inverse signals and optimizing signal distribution across ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inverse signals are generated for all output ports, then signal completeness is improved, but power consumption increases significantly
Solution Approach 1:
The patent extracts and eliminates the unnecessary inverse signal generation for unused output ports. By detecting which ports are actively used, the system removes the harmful power-consuming signal switching on unused ports while maintaining complete signaling on used ports, directly resolving the contradiction between signal completeness and power consumption.
Solution Approach 2:
The patent applies different signal generation strategies to different output ports based on their usage status. Used ports receive both original and inverse signals for complete signaling, while unused ports have their inverse signals disabled. This localized differentiation resolves the contradiction by optimizing each port's signal quality according to its actual needs.
2Speed
If all signals are switched simultaneously, then signal distribution speed is improved, but signal interference increases
Solution Approach 1:
The patent segments the simultaneous switching activity by disabling inverse signal switching on unused ports. This segmentation reduces the total number of signals switching at any given time, thereby reducing signal interference while maintaining fast signal distribution on the subset of ports that are actually in use.
3Quantity of substance
If more pins are used for signaling, then signal capacity is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes the output ports universal by enabling them to serve multiple functions through software-controlled activation. The same physical pins can be dynamically assigned to different signal roles (original or inverse) based on usage patterns, reducing the need for dedicated pins for each signal type and thereby reducing overall pin count while maintaining signal capacity.
Data Source
AI summary
A register clock driver for a DDR5 memory is presented. A register clock driver (RCD) can include a logic having one or more input channels, each of the one or more input channels receiving input signals; and a plurality of ranked output ports associated with each of the one or more input channels, the logic providing the input signals received on each of the one or more input channels to the associated plurality of ranked output ports according to control signals. The RCD can operate in a default mode, wherein input signals from the input channels are output to both of the output ports associated with that channel, or can operate in a non-default mode where input signals from the input channels are sent to the appropriate ranked output port associated with that channel. In either case, unused signaling on the output ports is held high.