Dual Path Source Synchronous Interface Signal Integrity
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Solution Overview
Problem
As integrated circuits operate at higher speeds, ensuring signal integrity over longer distances becomes challenging due to signal degradation caused by factors like resistance, process, voltage, and temperature variations, as well as smaller time windows for signal arrival, which existing signaling strategies struggle to effectively address.
Innovation Solution
A dual-path source synchronous interface is implemented, where serial data is split into two separate bit streams and transmitted over two signal lines at half the original data rate, allowing for recombination into a single stream at the receiver, maintaining the overall data rate and reducing clock frequency to enhance signal integrity and reduce dynamic power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data is transmitted at higher speeds over longer distances, then data transfer rate is improved, but signal integrity deteriorates due to degradation from resistance, process, voltage, and temperature variations
Solution Approach 1:
The patent divides a single high-speed data stream into two separate lower-speed streams and transmits them over two different signal paths. Each path operates at half the original data rate, which reduces signal degradation while maintaining overall throughput by combining the streams at the receiver.
Solution Approach 2:
The patent transitions from a single-dimensional transmission approach to a two-dimensional approach by using two separate signal paths (e.g., different metal traces or layers) to transmit data. This spatial diversification allows each path to operate under less stressful conditions while collectively achieving the original performance target.
2Productivity
If clock frequency is increased to maintain data rate over longer distances, then data transfer speed is improved, but dynamic power consumption increases
Solution Approach 1:
The patent segments the high-frequency clock signal into two lower-frequency clock signals, each operating at half the original frequency. This reduces the dynamic power consumption of each individual clock signal while maintaining the overall data transfer rate through parallel transmission paths.
3Device complexity
If single signal path is used for high-speed data transmission, then device complexity is minimized, but signal degradation occurs over longer distances
Solution Approach 1:
The patent segments the data transmission into two parallel paths, each handling alternating bits of the original data stream. This segmentation allows each path to operate at reduced speed with better signal integrity, while the overall system complexity remains manageable through systematic implementation.
Data Source
AI summary
A dual path source synchronous interface is disclosed. In one embodiment, a source synchronous interface includes a transmitter coupled to serially receive data from a first functional circuit block, and a receiver coupled to provide data serially to a second functional circuit block. Data is conveyed to the transmitter on a single signal line, and similarly, from the receiver on another single signal line. The transmitter is coupled to the receiver by two signal lines. The serial data received by the transmitter may be separated into two streams of alternating bits, e.g., a first bit is transmitted on one signal line, the next bit is transmitted on the other signal line, and so forth. At the receiver, the alternating bit streams may be re-combined into a single bit stream for transfer to the second functional circuit.