Mode-Selectable Signal Sampling Circuit for DDR5 Command Pulses
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Solution Overview
Problem
Existing command decoding solutions for DRAM chips, particularly in DDR5 DRAM, face challenges in distinguishing between 2T CMD and NT ODT CMD signals due to complex pulse shape changes, leading to decoding errors and increased circuit area and power consumption.
Innovation Solution
A signal sampling circuit comprising a signal input circuit, mode selection circuit, first and second clock processing circuits, and command decoding circuit, which determines target mode clock and chip select signals based on pulse widths to accurately decode 2T CMD and NT ODT CMD signals in different cycle modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate decoding circuits are arranged for command signals in different modes, then decoding accuracy is improved, but circuit area increases
Solution Approach 1:
A single command decoding circuit is designed to handle multiple command types (2T CMD and NT ODT CMD) by receiving mode selection signals that configure the circuit's behavior. The mode selection signal enables the same physical circuit to perform different decoding functions based on the operational mode, eliminating the need for separate dedicated circuits for each command type while maintaining accurate decoding for both modes.
2Reliability
If separate decoding circuits are arranged for command signals in different modes, then decoding accuracy is improved, but power consumption increases
Solution Approach 1:
The command decoding circuit operates as a universal circuit that can be dynamically configured for different modes through mode selection signals. Instead of having multiple always-on decoding circuits that would consume power continuously, a single circuit is activated and configured based on the current mode requirement, significantly reducing overall power consumption while maintaining the ability to accurately decode both 2T CMD and NT ODT CMD signals when needed.
Solution Approach 2:
The decoding circuit incorporates dynamic reconfiguration capability through mode selection signals that change the circuit's operational characteristics based on the current mode. This dynamic adaptation allows the same hardware to switch between different decoding functions without physical reconfiguration, enabling accurate decoding of different command types while avoiding the power overhead of maintaining multiple static circuits simultaneously.
3Reliability
If separate decoding circuits are arranged for command signals in different modes, then decoding accuracy is improved, but device complexity increases
Solution Approach 1:
The invention employs a universal command decoding circuit that can handle multiple command types through configuration via mode selection signals. This approach consolidates what would otherwise require multiple separate decoding circuits into a single multi-functional unit, reducing the overall complexity of the device while preserving the ability to accurately decode both 2T CMD and NT ODT CMD signals through software or control signal-based configuration rather than hardware duplication.
Data Source
AI summary
A signal sampling circuit and a semiconductor memory device are provided. The signal sampling circuit includes a signal input circuit, configured to determine a to-be-processed command signal and a to-be-processed chip select signal; a mode selection circuit, configured to determine a target mode clock signal and a target mode chip select signal according to the mode selection signal; a first clock processing circuit, configured to perform sampling and logic operation on the to-be-processed chip select signal and the target mode chip select signal according to the target mode clock signal, to obtain a first chip select clock signal; a second clock processing circuit, configured to perform sampling and logic operation on the to-be-processed chip select signal and the target mode chip select signal according to the target mode clock signal, to obtain a second chip select clock signal; and a command decoding circuit, configured to determine a target command signal.