Memory Channel Loopback Timing Using Falling-Edge Alignment
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Solution Overview
Problem
Existing loopback techniques in memory devices face challenges in supporting timing parameters for loopback signals, particularly at higher clock frequencies, as they lack sufficient time to generate loopback signals with industry-standard edge-aligned timing specifications.
Innovation Solution
Implementing relaxed timing parameters for loopback signals by aligning the loopback signal with a falling edge of a clock signal instead of the standard edge-aligned timing, allowing for a longer duration to establish loopback signals, thereby supporting more robust loopback functionality and higher communication speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If edge-aligned timing specifications are used for loopback signals, then timing precision is improved, but the ability to support higher clock frequencies deteriorates due to insufficient time to generate loopback signals
Solution Approach 1:
The patent changes the timing parameter from edge-aligned to center-aligned relative to the clock signal. This parameter change allows the loopback signal sufficient time to be generated and transmitted back to the host device, enabling support for higher clock frequencies while maintaining reliable signal transmission.
2Speed
If higher clock frequencies are used, then communication speed is improved, but signal integrity deteriorates due to insufficient time for loopback signal generation
Solution Approach 1:
By changing the timing parameter from edge-aligned to center-aligned, the patent ensures that the loopback signal has adequate time to be generated and transmitted even at higher clock frequencies. This maintains signal integrity and reliability while enabling faster communication speeds.
3Productivity
If center-aligned timing is used for loopback signals, then support for higher clock frequencies is improved, but timing precision relative to edge-aligned specifications deteriorates
Solution Approach 1:
Instead of aligning the loopback signal to the clock edge (conventional approach), the patent inverts the approach by centering the loopback signal between clock edges. This inversion provides sufficient time for signal generation at higher frequencies while maintaining a deterministic timing relationship through center-alignment.
Data Source
AI summary
Methods, systems, and devices for output timing for channel loopback of a memory device are described. For example, a memory device may be configured to receive a first signal indicative of a logic value in accordance with a rising edge of a first clock signal, and to output a second signal indicative of the logic value in accordance with a falling edge of a second clock signal. In various examples, the second clock signal may be generated by the memory device based on receiving the first clock signal from the host device, or the first clock signal and the second clock signal may be the same clock signal, which may be generated at the memory device based on a different clock signal received from the host device. In some examples, the timing of the second signal may be different than timing implemented for other signaling from the memory device.