Programmable Memory Interfaces for Cleaner CA Routing
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Solution Overview
Problem
Existing wire routing and wire bonding technologies in circuit boards and integrated circuit (IC) packages face challenges in satisfying design constraints related to manufacturability and performance, particularly in configurations with multiple dies and CA interfaces.
Innovation Solution
The implementation of memory devices with programmable command-and-address (CA) and data interfaces, allowing for adjustable operational modes and selection of active CA or data interfaces based on configuration information received from a memory controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple CA interfaces are provided in memory devices, then adaptability and versatility are improved, but device complexity and wire routing difficulty increase
Solution Approach 1:
The patent implements programmable CA interfaces that can be dynamically configured through mode registers. The memory device can switch between different operational modes (e.g., single-threaded, multi-threaded, different data widths) by writing configuration values to specific register addresses. This dynamic reconfigurability allows the same physical interface to adapt to different system requirements without requiring multiple fixed interfaces, thereby reducing wire routing complexity while maintaining versatility.
Solution Approach 2:
The patent creates universal CA interfaces that can serve multiple functions through software configuration. A single CA interface can be programmed to handle different command sets, address formats, and data transfer modes. The interface can function as a single-ended or differential interface, support various data widths (e.g., 8-bit, 16-bit, 32-bit), and accommodate different operational modes. This multi-functionality eliminates the need for multiple dedicated interfaces, simplifying the physical connection requirements.
2Ease of operation
If programmable interfaces are implemented, then ease of operation and adaptability improve, but device complexity increases
Solution Approach 1:
The patent pre-organizes configuration options into structured mode registers with defined bit fields and addresses. Common configuration parameters (interface mode, data width, timing parameters) are mapped to specific register locations that can be programmed in a systematic manner. This preliminary organization of configuration space simplifies the programming task, as developers can refer to documented register maps rather than dealing with scattered configuration parameters throughout the device.
Solution Approach 2:
The patent introduces mode registers as intermediary structures between the control logic and the physical interface. These registers act as a configuration layer that translates high-level operational requirements into low-level interface settings. The separation of configuration (through registers) from execution (interface operation) simplifies the overall system architecture, allowing independent optimization of configuration complexity and interface complexity.
Data Source
AI summary
A memory device comprising a programmable command-and-address (CA) interface and/or a programmable data interface is described. In an operational mode, two or more CA interfaces may be active. In another operational mode, at least one, but not all, CA interfaces may be active. In an operational mode, all of the data interfaces may be active. In another operational mode, at least one, but not all, data interfaces may be active. The memory device can include circuitry to select: an operational mode; a sub-mode within an operational mode; one or more CA interfaces as the active CA interface(s); a main CA interface from multiple active CA interfaces; and/or one or more data interfaces as the active data interfaces. The circuitry may perform these selection(s) based on one or more bits in one or more registers and/or one or more signals received on one or more pins.