Bit Serializer Clock Segmentation for High-Frequency Timing Stability
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Solution Overview
Problem
As digital circuits grow in complexity and size, they face challenges in meeting hold time constraints and experience increased phase distortion due to rising clock speeds, making it difficult to serialize bits effectively at high frequencies.
Innovation Solution
A circuit comprising a clock circuit and a serializer, which generates multiple clock signals from a master clock signal to serialize bits using a system of latches and rotary clock signals, allowing for robust high-frequency serial bit streams with stable timing characteristics, even across large spatial separations within an integrated circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If clock speed is increased to achieve higher serialization frequency, then productivity is improved, but phase distortion and timing constraint violations worsen
Solution Approach 1:
The patent divides the high-frequency clock signal into multiple lower-frequency clock signals distributed to different parts of the chip. Each local clock signal operates at a reduced frequency that satisfies timing constraints, while collectively they enable high-rate serialization through coordinated operation of multiple serializer units.
Solution Approach 2:
The patent transitions from a single high-frequency clock dimension to multiple lower-frequency clock dimensions distributed spatially across the chip. This dimensional transformation allows the system to achieve high effective serialization rate through parallel operation while each individual clock path maintains reliable timing characteristics.
2Adaptability or versatility
If chip size is increased to accommodate more complex circuits, then adaptability is improved, but hold time constraint satisfaction worsens
Solution Approach 1:
The patent segments the large chip into multiple smaller functional blocks, each with its own local clock distribution network. This segmentation reduces the maximum clock propagation distance within each block, ensuring hold time constraints are met even as overall chip complexity increases.
Solution Approach 2:
The patent implements local clock distribution where each serializer unit receives its own dedicated clock signal tailored to its specific location and requirements. This local optimization ensures that timing constraints are satisfied in each region of the chip regardless of overall chip size.
3Adaptability or versatility
If spatial separation between clock source and serializer is increased to accommodate large chip layouts, then adaptability is improved, but phase distortion worsens
Solution Approach 1:
The patent divides the clock distribution into multiple local segments rather than using a single long-distance clock path. Each local clock segment covers a limited spatial area, minimizing phase distortion while allowing flexible chip layout through multiple distributed clock sources.
Solution Approach 2:
The patent introduces intermediate clock distribution stages that buffer and re-synchronize clock signals between the master clock source and remote serializer units. These intermediaries maintain phase coherence over large spatial separations while allowing layout flexibility.
Data Source
AI summary
A circuit for serializing bits including a clock circuit and a serializer. The clock circuit may be configured to generate a plurality of clock signals from a received master clock signal. A plurality of bits may be transmitted to the serializer in response to a transition of a first clock signal. The serializer may comprise a system of latches and a rotary circuit. The system of latches may be configured to receive a first half of the plurality of bits in response to a first transition of a second clock signal and to receive a second half of the plurality of bits in response to a transition of a third clock signal. The rotary circuit may be configured to receive the plurality of bits from the system of latches and to output each bit at a particular time based on a plurality of rotary clock signals.