Memory Module Synchronous Arbitration for Multi-Interface Register Access

The patent introduces a synchronous arbitrator as an intermediary component between multiple interfaces and the register file. This arbitrator receives access requests from multiple interfaces (eFuse interface, in-band interface, sideband interface), arbitrates them according to priority rules, and grants access sequentially. This mediator prevents direct conflicts while maintaining support for multiple interfaces, thus preserving versatility while improving reliability.

The patent implements preliminary arbitration before register access is granted. The synchronous arbitrator evaluates access requests from multiple interfaces in advance, determines priority based on predefined rules (eFuse interface highest priority, then in-band, then sideband), and grants access rights before actual data transmission occurs. This preliminary action prevents conflicts by establishing access order beforehand.

The patent applies local quality by assigning different priority levels to different interfaces based on their specific requirements. The eFuse interface receives highest priority for configuration operations, the in-band interface receives medium priority for normal data operations, and the sideband interface receives lowest priority. This localized priority assignment simplifies the arbitration logic compared to a fully general solution, as each interface has a predetermined role.

The synchronous arbitrator is designed to autonomously evaluate and arbitrate access requests without requiring external intervention. It automatically detects which interface has the highest priority among concurrent requests and grants access accordingly. This self-service capability reduces the need for additional control logic and external arbitration mechanisms, thereby limiting the increase in device complexity.

The patent implements periodic arbitration cycles where the synchronous arbitrator continuously monitors access requests from multiple interfaces and grants access in a systematic sequence. When conflicts occur, the arbitrator processes them in periodic intervals based on priority, allowing high-priority interfaces to access first, then medium-priority, then low-priority interfaces. This periodic structured approach prevents chaos while maintaining predictable throughput.

The patent applies partial action by allowing simultaneous access when no conflicts exist. The synchronous arbitrator only intervenes to serialize access when multiple interfaces attempt to access the register file at the same time. When interfaces access independently without conflict, full-speed operation is maintained. This selective arbitration minimizes the impact on data transmission speed while still preventing conflicts when necessary.