Image Forming Apparatus Data Transfer Consistency Verification
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Solution Overview
Problem
Current image forming apparatuses face inefficiencies in data transfer processes due to the need for consistent checksum verification, which increases processor load and may not detect unauthorized data transfers effectively.
Innovation Solution
The implementation of a data transfer system with a consistency determination portion, abnormality determination portion, re-transfer control portion, and abnormality processing portion, which determines data consistency and handles abnormalities, reducing processor load and improving data transfer reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If checksum verification is performed for every data transfer, then data transfer reliability is improved, but processor load increases
Solution Approach 1:
The patent applies partial action by performing checksum verification selectively rather than for every data transfer. The system determines whether verification is necessary based on the data type and transfer context, executing checksum operations only when required. This reduces processor load while maintaining data transfer reliability for critical data transfers.
2Reliability
If consistent checksum verification is performed, then data integrity is ensured, but data transfer efficiency decreases
Solution Approach 1:
The system performs checksum verification partially based on data type and transfer conditions. For certain data types or trusted transfer paths, verification is omitted or simplified, thereby maintaining data integrity for critical transfers while improving overall data transfer efficiency across the system.
3Reliability
If unauthorized address detection causes serial bus state transition, then security is improved, but communication stability deteriorates
Solution Approach 1:
The patent introduces an intermediary verification mechanism that detects unauthorized addresses and validates data transfers before allowing state transitions. This intermediary layer ensures security by identifying unauthorized operations while preventing arbitrary state changes that would disrupt communication stability. The system maintains stable communication by processing security violations through a controlled verification pathway rather than immediate state transitions.
Data Source
AI summary
An image forming apparatus includes a first processor, a second processor, a data transfer portion, a consistency determination portion, an abnormality determination portion, a re-transfer control portion, and an abnormality processing portion. The data transfer portion transfers data via a bus between a storage medium and the second processor. The consistency determination portion determines whether or not there is consistency between data before and after a transfer by the data transfer portion. The abnormality determination portion, upon determination that there is consistency, determines whether or not there is abnormality in the data transfer process. The re-transfer control portion, upon determination that there is no consistency, causes the data transfer portion to re-transfer the data. The abnormality processing portion, upon determination that there is abnormality in the data transfer process, prohibits the re-transfer control portion from re-transferring the data, and executes an abnormality process to handle the abnormality.