Programmable Clock Distribution Chip for Multi-Standard Signaling
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Solution Overview
Problem
Conventional clock distribution chips are limited in supporting a variety of signaling standards, leading to resource wastage due to the need for multiple chip models to accommodate different devices with different clock signal requirements, including zero-delay and non-zero-delay signals, on a single printed circuit board.
Innovation Solution
A clock distribution chip with programmable clock dividers and outputs, coupled with a switch fabric, allowing configuration to support multiple signaling standards and generate both zero-delay and non-zero-delay clock signals, accommodating a wide range of input and output clock signals with adjustable voltage amplitudes and phase offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple chip models are used to support different signaling standards and clock signal requirements, then compatibility with diverse devices is improved, but device complexity and resource wastage increase
Solution Approach 1:
The clock distribution chip is designed to support multiple signaling standards (LVPECL, LVDS, LVTTL, LVCMOS, HSTL, SSTL) and generate both zero-delay and non-zero-delay clock signals within a single chip model. The programmable switch fabric and configurable output stages enable one chip to perform functions previously requiring multiple specialized chips, thereby reducing device complexity while maintaining broad compatibility.
Solution Approach 2:
The chip incorporates programmable switch fabric and configurable output stages that can be dynamically adjusted to match different signaling standards and clock signal requirements. This dynamic reconfigurability allows the same physical chip to adapt its behavior for different applications without requiring multiple fixed models, resolving the contradiction between versatility and complexity.
2Manufacturing precision
If PLL-based zero-delay buffers are used to generate precise clock signals, then phase offset control is improved, but jitter inherent in PLL-generated signals increases
Solution Approach 1:
The chip is divided into functionally independent segments: PLL-based zero-delay buffer sections for precise phase control where needed, and non-PLL-based simple clock buffer sections for applications where jitter is acceptable. The programmable switch fabric allows selective routing to appropriate sections based on application requirements, enabling fine-grained optimization of phase precision versus jitter tolerance in different parts of the system.
Solution Approach 2:
Different sections of the clock distribution chip are designed with different characteristics tailored to specific local requirements. Some output stages use PLL-based architecture for high phase precision in locations requiring strict timing, while other stages use simpler non-PLL architecture with higher jitter tolerance in locations where absolute phase precision is less critical, optimizing the overall system.
3Device complexity
If non-zero-delay buffers are used to provide multiple clock signals, then circuit simplicity is improved, but predictable phase offsets cannot be ensured
Solution Approach 1:
The chip segments clock signal generation into two pathways: a simple non-PLL buffer pathway for basic clock distribution where phase precision is not critical, and a PLL-based zero-delay buffer pathway for applications requiring precise phase control. The programmable switch fabric enables flexible combination of both pathways, providing circuit simplicity where needed while ensuring phase offset predictability where required.
Data Source
AI summary
In one embodiment, a clock distribution chip includes a clock input adapted to receive an input clock signal, clock dividers each adapted to receive a clock signal based on the first input clock signal and to generate a divided clock signal, and programmable clock outputs adapted to provide output clock signals. The clock outputs are configurable to support a number of signaling standards. A programmable switch fabric is coupled between the clock dividers and the clock outputs and is configurable to provide the divided clock signals to the clock outputs.