Interrupt Controller Circuit for RFID Data Throughput
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Solution Overview
Problem
Current passive RFID tags using EEPROM memory are inefficient for high-throughput applications due to slow data transfer rates, and existing protocols are not optimized for faster memory technologies like FRAM, which are needed to handle increased data demands in environments such as factories and toll collection.
Innovation Solution
The implementation of an interrupt controller circuit with a memory access control system, including a memory, memory access control circuit, RFID interface, secondary interface, and interrupt manager, which optimizes data transfer by using a bidirectional serial interface that minimizes clock transitions and incorporates a memory pointer for efficient data storage and retrieval, enabling faster data exchange with FRAM memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If EEPROM memory is used in passive RFID tags, then the system is simple and reliable, but the data throughput is slow and cannot meet high-throughput application requirements
Solution Approach 1:
The memory access control system is segmented into distinct functional modules: a memory interface unit for FRAM memory access, a serial interface unit for data communication, an interrupt controller for coordination, and a status register for control. This segmentation allows each module to be optimized independently, achieving high throughput while maintaining manageable system complexity through modular design
Solution Approach 2:
An interrupt controller is introduced as an intermediary component between the FRAM memory interface and the serial interface. This intermediary coordinates access between the two interfaces, managing conflicts and optimizing data transfer timing, thereby enabling high throughput without requiring direct complex interaction between all system components
2Productivity
If existing EEPROM-based protocols are used, then compatibility is maintained, but the protocols are not optimized for faster memory technologies like FRAM
Solution Approach 1:
The serial interface is designed with dynamic timing control that can adapt to different memory access speeds. The interrupt controller dynamically adjusts the coordination between serial and memory interfaces based on actual FRAM access patterns, allowing the system to maintain high throughput while remaining compatible with existing RFID protocols through flexible timing rather than rigid fixed-clock operations
Solution Approach 2:
The system changes critical timing parameters and control signal characteristics to optimize for FRAM memory speeds. By modifying the timing of memory access signals and adjusting the interrupt response characteristics, the system achieves high data transfer rates while maintaining protocol compatibility, as the changes are made in implementation parameters rather than fundamental protocol structure
3Use of energy by moving object
If bidirectional serial interface with minimal clock transitions is implemented, then power consumption is reduced, but the interface complexity increases
Solution Approach 1:
The serial interface circuitry merges multiple functions into integrated units: the data transmission and clock recovery functions are combined in a single serial interface unit, and the interrupt coordination function is merged with the memory access control. This merging reduces the total number of separate components and interconnections, thereby reducing power consumption while the integrated design actually simplifies the overall circuitry despite the bidirectional operation requirements
Data Source
AI summary
A memory circuit includes a memory, a memory access control circuit coupled to the memory, an RFID interface coupled to the memory access control circuit, a secondary interface coupled to the memory access control circuit, and an interrupt manager coupled to the memory access control circuit, the RFID interface, and the secondary interface.