Strobe Receiver Gating for Skew-Tolerant Burst Sampling
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Solution Overview
Problem
Strobe-timed signaling systems face challenges due to time-varying skew between incoming strobe/data ensembles and internal clock domains, leading to tight assertion/deassertion timing margins and complications from overlapping preamble and postamble waveforms, especially in close data bursts.
Innovation Solution
Adaptive strobe gating is implemented using a gate synthesizer circuit that generates a gating signal based on timing events in the incoming strobe signal, allowing for deterministic gating window management through reference-domain and strobe-domain enable signals, accommodating varying burst separations and skew conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gating signal uses fixed timing margins to frame active strobe edges and block overhead edges, then the gating operation is simple, but timing errors and glitches occur under varying skew conditions and tight burst separation intervals
Solution Approach 1:
The patent implements dynamic gating by using the actual incoming strobe signal to control the gating window timing rather than fixed predetermined margins. The gate signal is generated to be dynamically aligned with the strobe envelope, allowing the gating operation to adapt automatically to varying skew conditions and burst separation intervals, thereby maintaining high reliability without requiring complex external control circuits
Solution Approach 2:
The gating mechanism uses the strobe signal itself to generate the gate control waveform, making the system self-regulating. The strobe envelope directly controls the gating window timing, eliminating the need for separate complex control logic to track skew variations, thus achieving reliable gating with reduced overall system complexity
2Adaptability or versatility
If the system accommodates large skew variations between strobe/data ensemble and internal clock domain, then the system is more robust, but the gating timing margins become insufficient for tight burst separation intervals
Solution Approach 1:
The patent employs dynamic gating where the gate signal timing is continuously aligned with the incoming strobe envelope rather than using fixed predetermined windows. This dynamic alignment allows the system to accommodate large skew variations while automatically adjusting the gating window position and duration, ensuring adequate timing margins are maintained even under tight burst separation conditions
Solution Approach 2:
The system performs preliminary detection and qualification of preamble features using reference-domain timing before the actual data burst arrives. This preliminary action allows the gate signal to be pre-positioned and pre-timed based on detected skew conditions, ensuring that when the data burst arrives, the gating window is already correctly positioned with adequate margins, thus accommodating both large skew variations and tight burst separation
3Productivity
If the gate signal assertion and deassertion occur with tight timing margins, then the signaling throughput is higher, but timing errors and glitches may occur
Solution Approach 1:
The patent implements dynamic gating where the gate signal timing is continuously aligned with the actual incoming strobe envelope rather than using fixed predetermined windows. This dynamic alignment ensures that the gating operation automatically adapts to maintain adequate timing margins even when burst separation intervals are tight, thereby achieving high signaling throughput without sacrificing gating reliability
Solution Approach 2:
The system uses feedback from the detected strobe envelope and preamble features to continuously adjust the gate signal timing. By monitoring the actual strobe signal characteristics and using this information to position the gating window, the system ensures adequate timing margins are maintained dynamically, allowing high throughput operation without timing errors or glitches
4Stability of the object's composition
If the system uses reference-domain timing for gate signal generation, then the gating is synchronized with internal clock, but skew variations cause timing misalignment with incoming strobe edges
Solution Approach 1:
The system performs preliminary detection and qualification of preamble features using reference-domain timing before the actual data burst arrives. This preliminary action in the stable reference domain allows the gate signal to be pre-positioned and pre-timed based on detected skew conditions, ensuring that when the data burst arrives, the gating window is already correctly positioned with adequate margins, thus accommodating both large skew variations and tight burst separation
Solution Approach 2:
The patent uses the detected strobe envelope and preamble features as an intermediary between the stable reference clock domain and the incoming variable-frequency strobe signal. This intermediary information about actual skew conditions allows the system to translate reference-domain timing into accurately positioned gate signals that are properly aligned with the incoming strobe edges despite skew variations
Data Source
AI summary
A first-in-first-out (FIFO) storage structure within an integrated-circuit component is loaded with qualification values corresponding to respective pairs of edges expected within a timing strobe signal transmitted to the integrated-circuit component. The qualification values are sequentially output from the FIFO storage structure during respective cycles of the timing strobe signal and a gate signal is either asserted or deasserted during the respective cycles of the timing strobe signal according to the qualification values output from the FIFO storage structure.