Memory Controller Buffer Selection Logic for Dynamic Port Prioritization
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Solution Overview
Problem
In multi-port memory controllers, write buffers are not utilized evenly due to varying demand from different devices, leading to inefficiencies as some ports experience low memory access while others have high demand, resulting in underutilization of buffers and potential delays in writing data to memory.
Innovation Solution
Implementing buffer selection logic that assigns priority to each port and buffer dynamically, allowing write requests to be stored in the highest priority available buffer, and using buffer arbitration logic to manage write and read requests, ensuring efficient data storage and retrieval by merging write data within cache lines and managing coherence hits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each port has a dedicated write buffer, then write requests from each port can be absorbed without immediate writing to memory, but buffers are not utilized evenly due to varying demand from different ports
Solution Approach 1:
The patent implements a universal buffer pool where any port can access any buffer, rather than dedicating specific buffers to specific ports. The buffer selection logic dynamically assigns available buffers to ports with pending write requests, allowing buffers to serve multiple ports based on current demand patterns. This resolves the contradiction by making buffers multi-functional resources that can adapt to varying port demands.
Solution Approach 2:
The patent introduces dynamic buffer assignment through buffer selection logic that continuously monitors buffer availability and port demand. When a port has a high demand, it can utilize more buffers; when demand is low, buffers are released for other ports. This dynamic allocation ensures both reliable write request handling and efficient buffer utilization across varying workloads.
2Productivity
If one port has high demand for memory access, then that port can maintain data in buffers longer, but other ports with low demand experience underutilization of buffers
Solution Approach 1:
The patent implements a buffer recovery mechanism where buffers are continuously monitored and released back to the pool when no longer needed by high-demand ports. The buffer selection logic identifies when a high-demand port no longer needs specific buffers and recovers them for allocation to low-demand ports. This prevents buffer hoarding and ensures timely availability of buffers for all ports.
Solution Approach 2:
The buffer selection logic implements feedback by monitoring both buffer usage status and port demand patterns. When a high-demand port's buffer usage decreases or its demand fluctuates, the system detects this through feedback signals and reallocates buffers to low-demand ports. This feedback mechanism balances buffer distribution dynamically, reducing wait times for all ports.
3Reliability
If write data is immediately written to memory, then memory consistency is maintained, but ports with high demand experience delays due to memory write timing constraints
Solution Approach 1:
The patent implements preliminary action by allowing write requests to be accepted and staged in the buffer pool before actual memory writing occurs. The buffer selection logic prepares buffer assignments in advance, and multiple ports can have their write requests acknowledged and staged simultaneously. This preliminary staging reduces the apparent wait time for ports while maintaining memory consistency through controlled write-back mechanisms.
Solution Approach 2:
The buffer pool acts as an intermediary between ports and memory, decoupling the immediate write request acceptance from the actual memory write timing. High-demand ports can continue generating write requests that are absorbed by the buffer intermediary, while the memory interface writes data at its own pace. This intermediary layer masks the memory write timing constraints from the ports, reducing perceived delays while maintaining data consistency.
Data Source
AI summary
A memory controller containing one or more ports coupled to a buffer selection logic and a plurality of buffers. Each buffer is configured to store write data associated with a write request and each buffer is also coupled to the buffer selection logic. The buffer selection logic is configured to store write data associated with a write request from at least one of the ports in any of the buffers based on a priority of the buffers for each one of the ports.