Shared Memory Interface for LPDDR4 and LPDDR4X Protocol Switching
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Solution Overview
Problem
Existing semiconductor devices lack the ability to efficiently support multiple memory protocols, such as LPDDR4 and LPDDR4X, which have different power consumption and bandwidth requirements, leading to increased complexity and cost in manufacturing.
Innovation Solution
A semiconductor device design that includes a memory cell array and a shared memory interface, supported by two peripheral circuits that can operate according to either the LPDDR4 or LPDDR4X protocol, with a voltage detector to determine the appropriate protocol based on the external power supply voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a semiconductor device is designed to support multiple memory protocols (LPDDR4 and LPDDR4X), then the adaptability and versatility of the device is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent implements a universal memory interface design where a single memory interface circuit can operate with both LPDDR4 and LPDDR4X protocols. The memory interface includes protocol detection functionality that automatically identifies the connected memory type and configures appropriate operating parameters, eliminating the need for separate dedicated interfaces for each protocol version.
Solution Approach 2:
The patent employs dynamic configuration capabilities where the memory controller can adaptively adjust timing parameters, voltage levels, and signal characteristics based on the detected memory protocol. This dynamic adaptation allows the same hardware to optimize its operation for different protocol requirements without manual reconfiguration or multiple fixed designs.
2Reliability
If separate peripheral circuits are designed for each memory protocol, then the reliability and performance for each protocol is optimized, but the manufacturing cost and production complexity increase
Solution Approach 1:
The patent merges the functionality of separate LPDDR4 and LPDDR4X peripheral circuits into a single integrated memory controller. This unified controller incorporates protocol detection mechanisms that automatically identify the memory type and switch between different operational modes, combining what would traditionally require separate hardware implementations into one cohesive unit.
Solution Approach 2:
The memory controller is designed as a universal interface that can reliably support both LPDDR4 and LPDDR4X protocols through adaptive configuration. The controller includes detection circuitry that identifies the protocol being used and automatically adjusts timing, voltage, and control signal parameters to maintain optimal performance for each specific protocol version.
3Manufacturing precision
If different masks are used for fabricating different memory protocols, then the manufacturing precision for each protocol is maintained, but the productivity and production efficiency decrease
Solution Approach 1:
The patent separates protocol-specific configuration parameters from the physical mask design. The masks are designed for a universal memory interface structure, while protocol-specific optimizations are achieved through software-based configuration and parameter adjustment after fabrication. This segmentation allows single masks to produce devices that can be configured for different protocols without requiring separate mask sets.
Solution Approach 2:
The patent implements protocol adaptation through parameter changes rather than physical structure changes. The memory controller can modify operating parameters such as timing delays, voltage levels, and signal swing characteristics based on the detected protocol, allowing the same fabricated device to operate correctly with different memory standards without requiring different manufacturing masks.
Data Source
AI summary
A semiconductor device and a method for manufacturing a semiconductor device are provided. The semiconductor device includes a memory cell array, a memory interface, a first peripheral circuit, and a second peripheral circuit. The first peripheral circuit supports a first memory protocol, and the second peripheral circuit, supports a second memory protocol different from the first memory protocol. The first peripheral circuit and the second peripheral circuit share the memory cell array and the memory interface.