DDR5 Signal Masking Circuit for Preserving CA Data During Power Saving
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Solution Overview
Problem
DDR5 DRAMs face challenges in minimizing power consumption while ensuring valid information is not lost during signal masking, as conventional architectures often result in CA information loss within the second clock period, leading to CMD decoding failures.
Innovation Solution
A signal masking circuit comprising a receiving circuit, a delay control circuit, and a logical operation circuit is implemented, where the delay control circuit generates a CS masking signal with a pulse width greater than or equal to two preset clock periods, allowing for effective invalid masking of initial processing signals without losing valid information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional signal masking is applied to reduce current consumption, then power consumption is reduced, but valid CA information is lost during the second clock period
Solution Approach 1:
The delay control circuit performs preliminary action by delaying the CS signal in advance to generate a masking signal that is synchronized with the CA signal timing. This preliminary timing adjustment ensures that the masking operation occurs at the correct moment, preventing information loss while enabling power reduction.
Solution Approach 2:
The patent introduces an intermediary masking signal generated from the delayed CS signal. This intermediary signal acts as a mediator between the original CS signal and the CA signal, enabling selective masking of invalid CA signals without affecting valid information, thus resolving the contradiction between power reduction and information preservation.
2Loss of energy
If signal masking is applied to mask invalid signals, then current waste is minimized, but CMD decoding fails due to information loss
Solution Approach 1:
The delay control circuit performs preliminary timing adjustment on the CS signal to generate a masking signal that is synchronized with the CA signal. This preliminary action ensures that masking occurs at the correct timing, preventing valid information loss and ensuring reliable CMD decoding while still achieving current waste minimization.
Solution Approach 2:
The masking signal serves as an intermediary that enables selective invalidation of CA signals. It mediates between the need to mask invalid signals for power saving and the need to preserve valid signals for reliable decoding, allowing the system to achieve both current waste minimization and CMD decoding reliability.
3Use of energy by stationary object
If CS signal pulse width is reduced to one clock period for power saving, then power consumption decreases, but valid information is lost in DDR5 DRAM
Solution Approach 1:
The delay control circuit performs preliminary timing adjustment on the CS signal to generate a masking signal with appropriate pulse width. This preliminary action ensures that the masking signal maintains sufficient duration to preserve valid information while still achieving power consumption reduction through selective masking of invalid signals.
Solution Approach 2:
The masking signal acts as an intermediary that resolves the contradiction between reduced pulse width for power saving and sufficient duration for information preservation. By using this intermediary signal with optimized timing and duration, the system achieves power consumption reduction without losing valid information in DDR5 DRAM.
Data Source
AI summary
A signal masking circuit includes a receiving circuit, a delay control circuit, and a logical operation circuit. The receiving circuit is configured to: receive a signal to be processed and a chip select (CS) signal, and output an initial processing signal and an initial CS signal. The delay control circuit is configured to perform delay and logical control operations on the initial CS signal to obtain a CS masking signal, where a pulse width of the CS masking signal is greater than or equal to two preset clock periods. The logical operation circuit is configured to perform invalid masking on the initial processing signal according to the CS masking signal to obtain a target signal.