Packet Switch Hub for Multi-Domain Logic Replication
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Solution Overview
Problem
Traditional hardware-assisted verification methods for integrated circuits with multiple clock domains require extensive hardware and complex software to synchronize simulation operations, leading to inefficiencies and scalability issues due to limitations in off-chip memory bandwidth and physical memory constraints.
Innovation Solution
A packet switch hub is used to concentrate signal data from multiple clock domains into a single stream, utilizing a single FIFO buffer to synchronize and distribute packets across virtual channels, eliminating the need for separate buffers and optimizing memory usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate FIFO buffers are used for each clock domain to synchronize simulation operations, then synchronization accuracy is improved, but hardware complexity and memory requirements increase significantly
Solution Approach 1:
The patent merges multiple separate FIFO buffers for different clock domains into a single shared FIFO buffer. The packet switch hub consolidates signal data from multiple clock domains into a single stream that is buffered in one FIFO, eliminating the need for multiple separate buffers and their associated synchronization complexity.
Solution Approach 2:
The packet switch hub acts as an intermediary between multiple clock domains and the single FIFO buffer. It receives packets from different clock domains, manages their serialization into a single stream, and handles the buffering in a unified manner, mediating the interaction between multiple domains and a single resource.
2Quantity of substance
If off-chip memory is used to increase FIFO buffering capacity, then buffering capacity is improved, but bandwidth limitations and memory overhead increase
Solution Approach 1:
The patent combines multiple FIFO buffers that would otherwise require separate off-chip memory allocations into a single shared FIFO buffer. This consolidation allows the system to utilize a single memory interface and address space, maximizing the effective bandwidth available for buffering operations across all clock domains.
Solution Approach 2:
The single FIFO buffer serves multiple clock domains simultaneously, making it a universal resource that handles buffering for the entire system rather than being dedicated to a single domain. This multi-functional approach optimizes memory utilization and eliminates the bandwidth overhead of multiple separate memory interfaces.
3Adaptability or versatility
If multiple FIFOs are built from a single physical memory to overcome pin limitations, then hardware scalability is improved, but bandwidth limitations due to context switching overhead increase
Solution Approach 1:
Instead of creating multiple virtual FIFOs from a single physical memory with separate address spaces, the patent merges all FIFO operations into a single unified buffer with a single address space. This eliminates the need for context switching between multiple FIFO address spaces and maximizes memory bandwidth utilization.
Solution Approach 2:
The patent extracts the context switching overhead by removing the need for multiple FIFO address spaces entirely. By using a single unified buffer, the system eliminates the memory management complexity and bandwidth overhead associated with switching between multiple FIFO contexts.
4Reliability
If traditional hardware-assisted verification methods are used with multiple clock domains, then verification capability is improved, but the requirement for extensive hardware and complex software increases
Solution Approach 1:
The patent merges the verification capabilities for multiple clock domains into a unified packet switch hub architecture. By consolidating the buffering and synchronization functions into a single hub that handles packets from all clock domains, the system maintains comprehensive verification capability while reducing the hardware and software complexity associated with managing multiple separate verification paths.
Data Source
AI summary
A method for debugging comprising configuring a switching logic mapping source subchannels to destination subchannels, as virtual channels to forward the packets from the source subchannels to the destination subchannels. The method further comprising configuring a single queue coupled to the switching logic to record packets from the source subchannels into a packet stream for a delay period to distribute to the destination subchannels for the destination logic to emulate the source logic synchronously with the plurality of clock domains with the delay period.