Memory Interface and Data Path Decoupling for Accurate Testing
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Solution Overview
Problem
Memory systems face challenges in accurately determining the maximum supported data rate for both the interface and data path due to differing data rates, leading to premature failure of operations if the interface supports a lower rate than the data path, limiting comprehensive testing capabilities.
Innovation Solution
Implementing interface and data path decoupling by allowing independent data rates for the interface and data path, with the interface operating at a slower rate during test modes to accommodate the data path's higher capabilities, using phase amplitude modulation (PAM) signaling and multiplexing to transmit data subsets at reduced rates for accurate strobing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the interface operates at a higher data rate to match the data path, then data transmission speed is improved, but testing accuracy deteriorates because the interface cannot accurately strobe the data
Solution Approach 1:
The patent segments the data transmission process into two independent parts: the data path operates at its maximum supported data rate independently, while the interface operates at a separately configurable data rate. This segmentation allows each component to be tested and operated at its optimal speed without being constrained by the other, resolving the contradiction between speed and strobing accuracy.
Solution Approach 2:
The patent implements dynamic configurability where the interface data rate can be independently adjusted and configured based on testing requirements. During testing, the interface can operate at lower rates for accurate strobing, while the data path maintains its maximum rate, allowing the system to adapt to different testing scenarios and resolve the speed-accuracy tradeoff.
2Measurement precision
If the interface operates at a lower data rate to ensure accurate strobing, then measurement precision is improved, but productivity deteriorates because the overall data transmission rate is limited
Solution Approach 1:
By segmenting the data path and interface into independently controllable units with separate data rate configurations, the system allows the data path to operate at high speeds for maximum throughput while the interface can be configured at appropriate rates for accurate operation, thus maintaining both precision and productivity simultaneously.
Solution Approach 2:
The patent changes the operational parameters by allowing independent configuration of data rates for the data path and interface. This parameter independence enables the system to optimize each component's operating point, allowing the data path to maximize throughput while the interface maintains accurate strobing at its supported rate.
3Adaptability or versatility
If independent data rates are configured for the data path and interface, then adaptability is improved, but device complexity increases due to additional configuration and control mechanisms
Solution Approach 1:
The patent implements a universal configuration mechanism that can handle both coupled and decoupled operating modes through a unified interface. The same data path and interface infrastructure supports both traditional coupled operation and the new independent operation mode, reducing the need for separate complex control systems and minimizing additional complexity while maximizing adaptability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables accurate testing of both the interface and data path at their respective maximum speeds, improving device performance by enhancing testing accuracy, reliability, and supporting higher data rates while reducing latency and power consumption.
Implementation Method 1
using phase amplitude modulation (PAM) signaling and multiplexing to transmit data subsets at reduced rates for accurate strobing
Data Source
AI summary
Methods, systems, and devices for interface and data path decoupling are described. In an operating mode, a data path and an interface of a memory system may execute at a same speed, while in two test modes, the data path may execute at a first speed, while the interface may execute at a second speed that is slower than the first speed. If the memory system receives an indication to enter one of the two test modes, the memory system may slow a data rate over the interface according to the indicated test mode by selecting a first subset or a second subset of encoded data to be transmitted over the interface, where the unselected subset may not be transmitted. To return to the operating mode, the device may be reset or may receive another dedicated signal to enter the operating mode.