AXI-to-Memory Protocol Bridge Latency Reduction
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Solution Overview
Problem
The Advanced eXtensible Interface (AXI) protocol faces challenges in efficiently managing memory operations due to the need for strict timing relationships between address and data operations, which can lead to increased latency and reduced bandwidth in data transfers, especially during refresh cycles.
Innovation Solution
The AXI-to-memory IP protocol bridge utilizes a time-slot counter and queuing buffers to serialize write and read transactions, allowing for parallel processing and eliminating the need for additional arbiters or infrastructure logic, by repurposing queuing buffers as arbiter logic and reordering AXI signals to match memory-specific protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strict timing relationships are enforced between address and data operations in AXI protocol, then protocol compliance is maintained, but latency increases and bandwidth utilization decreases
Solution Approach 1:
The patent segments the AXI protocol handling into distinct functional blocks within the bridge circuit: address channel processing, data channel processing, and refresh operation handling. Each segment operates semi-independently, allowing address operations to be processed and forwarded without waiting for corresponding data operations to complete, thereby maintaining protocol compliance while reducing latency
Solution Approach 2:
The bridge circuit acts as an intermediary between the AXI protocol and memory operations. It mediates the timing relationship by receiving address operations from the AXI interface, processing them through queuing buffers, and forwarding them to memory without requiring synchronous data operations, thus decoupling the strict timing constraints while maintaining protocol compliance
2Reliability
If additional arbiters and infrastructure logic are added to manage AXI-to-memory protocol conversion, then transaction ordering is maintained, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the bridge circuit: address channel processing, data channel processing, refresh operation handling, and transaction ordering are all integrated into a single protocol conversion circuit. This eliminates the need for separate arbiter logic and infrastructure components, reducing device complexity while maintaining reliable transaction ordering through the unified queue management system
Solution Approach 2:
The bridge circuit is designed as a universal protocol conversion unit that handles multiple types of operations (address operations, data operations, refresh operations) through a single integrated structure. The queuing buffers and processing logic serve multiple purposes: maintaining transaction order, managing different operation types, and coordinating with both AXI interface and memory operations, thereby eliminating the need for dedicated arbiter logic for each function
3Productivity
If independent read and write channels are used in AXI protocol, then bandwidth utilization improves, but protocol bridge complexity increases
Solution Approach 1:
The patent merges the handling of independent read and write channels into a unified bridge circuit structure. Both address channels (AR/AW) and data channels (R/W) are processed through shared queuing buffers and a single protocol conversion engine, eliminating the need for separate bridge structures for each channel while preserving the independent operation capability and bandwidth utilization benefits
Data Source
AI summary
An Advanced extensible Interface (AXI)-to-memory IP protocol bridge and associated apparatus and methods. The protocol bridge includes a first interface configured to be coupled to Write Address (AW), Write Data (W), Write Response (B), Read Address (AR) and Read Data (R) channels for the AXI manager and to implement AW, W, B, AR, and R signaling in accordance with an AXI protocol. A second interface is configured to couple I/O signals with the memory IP, with the I/O signals including a memory IP input channel to convey input data and input addresses with first I/O control signals, and a memory IP output channel to receive output data from the memory IP with second I/O control signals. The protocol bridge also includes logic for bridging the AXI protocol used by the AW, W, B, AR, and R signaling with a protocol used by the memory IP I/O signals.