DRAM Rank Segmentation for Power and Data Retention
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Solution Overview
Problem
Semiconductor devices, particularly DRAM devices, face data loss issues due to their design requiring frequent refresh operations and high power consumption, and existing initialization methods are inefficient in managing internal control operations and termination processes.
Innovation Solution
A semiconductor device with a first and second rank, each operating in synchronization with a clock signal based on selection signals, includes command generation circuits that manage internal control and termination operations, allowing for efficient termination without performing internal control operations, reducing power consumption and preventing data loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If DRAM devices are designed to operate at high speed with large cell capacitance, then operating speed is improved, but power consumption increases
Solution Approach 1:
The semiconductor device is divided into multiple ranks (first rank and second rank), each with independent command generation circuits. This segmentation allows selective operation of individual ranks, enabling the device to operate at high speed when needed while consuming less power during partial or idle operation modes.
2Reliability
If the semiconductor device performs initialization operations to set initial conditions, then reliability is improved, but operation time increases
Solution Approach 1:
Command generation circuits generate termination commands in advance based on predicted operation completion. This preliminary action ensures that initialization and other operations are properly terminated without delay, maintaining reliability while minimizing the time lost to termination overhead.
3Use of energy by moving object
If the semiconductor device enters power-down mode to minimize driving current, then power consumption is reduced, but data retention capability deteriorates
Solution Approach 1:
The device uses feedback mechanisms to monitor operation status and automatically generate termination commands when operations complete. This feedback control ensures that data is properly maintained and operations are correctly terminated even during power-down transitions, preventing data loss while managing power consumption effectively.
4Reliability
If the semiconductor device performs refresh operations to prevent data loss, then data retention is improved, but operation complexity increases
Solution Approach 1:
The command generation circuits automatically generate termination commands without external intervention. This self-service capability simplifies the overall device operation by eliminating the need for complex external control logic to manage initialization and termination sequences, reducing operational complexity while maintaining data integrity.
Data Source
AI summary
A semiconductor device includes a first rank and a second rank. The first rank operates in synchronization with a clock signal in response to a first rank selection signal, and the second rank operates in synchronization with the clock signal in response to a second rank selection signal. The first rank performs a termination operation without performing an internal control operation if the first rank selection signal maintains an enabled state in synchronization with a first edge and a second edge of the clock signal.