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Dissertation
Asymmetric Crosstalk Harnessed Signaling and its Application to 3-D High-Speed Parallel Interfaces
Washington State University
Doctor of Philosophy (PhD), Washington State University
01/2021
DOI:
https://doi.org/10.7273/000003358
Handle:
https://hdl.handle.net/2376/122905
Abstract
This doctoral research presents a novel signaling scheme called Asymmetric Crosstalk Harnessed Signaling (ACHS), which is based on the Crosstalk Harnessed Signaling (CHS) technique. Its application is on parallel high-speed interfaces whose large wiring integration targets require extensive use of fully three-dimensional (3D) interconnects. ACHS presents a non-square extension of the Hadamard matrix in which the common encoding eigenmode has been eliminated by either its removal from the matrix or a diagonal concatenation that turns it into a differential eigenmode, thereby encoding a group of bits into a slightly larger signal set (11% signaling/routing overhead). The resulting signaling scheme offers extremely good performance across all the data bits and the strobe signal encoded together in the interface; this is compared to the original CHS approach that has a high noise sensitivity related to the common encoding eigenmode, which in turn brings down the entire bus performance. The novel ACHS technique has been applied to 3D routing environments, where a collection of interconnects is implemented in square and hexagonal arrangements across 1, 2, 3 and 4 stacked signaling layers. Both CHS and ACHS have been extensively simulated, with the results of these simulations showing how ACHS significantly outperforms CHS at high-speed transfers (20 GT/s), even with the same routing real-estate scenario applied on both encodings, where CHS is supposedly benefitted from the additional space due to fewer interconnects to allocate. The performance of the encoded data bits is analyzed with their respective encoding eigenmodes so that best performing modes get assigned to the most critical signals like the strobe, which in turn translates into further performance optimization.
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Details
- Title
- Asymmetric Crosstalk Harnessed Signaling and its Application to 3-D High-Speed Parallel Interfaces
- Creators
- Daniel Iparraguirre
- Contributors
- José Delgado-Frías (Advisor)Hassan Ghasemzadeh (Committee Member)Subhanshu Gupta (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Voiland College of Engineering and Architecture
- Theses and Dissertations
- Doctor of Philosophy (PhD), Washington State University
- Publisher
- Washington State University
- Number of pages
- 111
- Identifiers
- 99900652205101842
- Language
- English
- Resource Type
- Dissertation