Parity Pin Command Address Fault Detection
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Solution Overview
Problem
Existing memory devices struggle to detect command or address-related errors on the command/address (CA) bus, which can lead to undetected failures and safety concerns in applications like autonomous vehicles.
Innovation Solution
The implementation of a parity pin system that uses parity bits generated by both the host device and the memory device to detect faults in the CA bus. The system compares these parity bits to identify any discrepancies, triggering an alert signal to the host device for corrective action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional memory devices are used without parity pin system, then device complexity is low, but reliability of command/address bus is insufficient and errors cannot be detected
Solution Approach 1:
The patent introduces a parity pin as an intermediary element between the host device and memory device. This parity pin carries parity information that mediates the verification of command and address signals, enabling error detection without requiring complex restructuring of the existing CA bus architecture.
Solution Approach 2:
The patent implements parity generation by creating a simplified copy of the CA bus data through parity bits. The host device generates parity bits from the command and address signals, and the memory device regenerates and compares these parity bits to detect errors, effectively using a redundant information copy for verification purposes.
2Reliability
If parity pin system is implemented, then reliability and safety of memory operations improve, but device complexity increases
Solution Approach 1:
The patent applies local quality by implementing parity functionality only where needed - specifically at the host device and memory device interfaces - rather than throughout the entire system. The parity pin provides localized error detection capability at critical points in the data path without requiring complex protection mechanisms across all components.
Solution Approach 2:
The patent changes the parameter space by adding a dedicated parity pin dimension to the existing interface protocol. This additional parameter carries parity information that complements the existing command and address signals, enabling error detection through parameter comparison without fundamentally altering the core operational parameters of the memory system.
Data Source
AI summary
Implementations described herein relate to command address fault detection using a parity bit. A memory device may receive, from a host device via a command address (CA) bus and during a unit interval, a set of CA bits associated with a CA word. The memory device may receive, from the host device via a parity bus and during the unit interval, a first parity bit that is based on the set of CA bits and a parity generation process. The memory device may generate a second parity bit based on the set of CA bits and the parity generation process. The memory device may compare the first parity bit and the second parity bit. The memory device may selectively transmit an alert signal to the host device based on a result of comparing the first parity bit and the second parity bit.