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- All Subjects: DDR
- Creators: Benkert, Volker
- Creators: Kitchen, Jennifer
- Member of: ASU Electronic Theses and Dissertations
Description
The increase in computing power has simultaneously increased the demand for input/output (I/O) bandwidth. Unfortunately, the speed of I/O and memory interconnects have not kept pace. Thus, processor-based systems are I/O and interconnect limited. The memory aggregated bandwidth is not scaling fast enough to keep up with increasing bandwidth demands. The term "memory wall" has been coined to describe this phenomenon.
A new memory bus concept that has the potential to push double data rate (DDR) memory speed to 30 Gbit/s is presented. We propose to map the conventional DDR bus to a microwave link using a multicarrier frequency division multiplexing scheme. The memory bus is formed using a microwave signal carried within a waveguide. We call this approach multicarrier memory channel architecture (MCMCA). In MCMCA, each memory signal is modulated onto an RF carrier using 64-QAM format or higher. The carriers are then routed using substrate integrated waveguide (SIW) interconnects. At the receiver, the memory signals are demodulated and then delivered to SDRAM devices. We pioneered the usage of SIW as memory channel interconnects and demonstrated that it alleviates the memory bandwidth bottleneck. We demonstrated SIW performance superiority over conventional transmission line in immunity to cross-talk and electromagnetic interference. We developed a methodology based on design of experiment (DOE) and response surface method techniques that optimizes the design of SIW interconnects and minimizes its performance fluctuations under material and manufacturing variations. Along with using SIW, we implemented a multicarrier architecture which enabled the aggregated DDR bandwidth to reach 30 Gbit/s. We developed an end-to-end system model in Simulink and demonstrated the MCMCA performance for ultra-high throughput memory channel.
Experimental characterization of the new channel shows that by using judicious frequency division multiplexing, as few as one SIW interconnect is sufficient to transmit the 64 DDR bits. Overall aggregated bus data rate achieves 240 GBytes/s data transfer with EVM not exceeding 2.26% and phase error of 1.07 degree or less.
A new memory bus concept that has the potential to push double data rate (DDR) memory speed to 30 Gbit/s is presented. We propose to map the conventional DDR bus to a microwave link using a multicarrier frequency division multiplexing scheme. The memory bus is formed using a microwave signal carried within a waveguide. We call this approach multicarrier memory channel architecture (MCMCA). In MCMCA, each memory signal is modulated onto an RF carrier using 64-QAM format or higher. The carriers are then routed using substrate integrated waveguide (SIW) interconnects. At the receiver, the memory signals are demodulated and then delivered to SDRAM devices. We pioneered the usage of SIW as memory channel interconnects and demonstrated that it alleviates the memory bandwidth bottleneck. We demonstrated SIW performance superiority over conventional transmission line in immunity to cross-talk and electromagnetic interference. We developed a methodology based on design of experiment (DOE) and response surface method techniques that optimizes the design of SIW interconnects and minimizes its performance fluctuations under material and manufacturing variations. Along with using SIW, we implemented a multicarrier architecture which enabled the aggregated DDR bandwidth to reach 30 Gbit/s. We developed an end-to-end system model in Simulink and demonstrated the MCMCA performance for ultra-high throughput memory channel.
Experimental characterization of the new channel shows that by using judicious frequency division multiplexing, as few as one SIW interconnect is sufficient to transmit the 64 DDR bits. Overall aggregated bus data rate achieves 240 GBytes/s data transfer with EVM not exceeding 2.26% and phase error of 1.07 degree or less.
ContributorsBensalem, Brahim (Author) / Aberle, James T. (Thesis advisor) / Bakkaloglu, Bertan (Committee member) / Tirkas, Panayiotis A. (Committee member) / Kitchen, Jennifer (Committee member) / Arizona State University (Publisher)
Created2018
Description
ABSTRACT
German history during the 20th century was extremely complex—containing numerous events that can be labelled horrific and traumatic. The horrors and traumas of WWII forced Germans to actively address their country’s National Socialist pasts by taking responsibility for their roles, creating a national memory about the Nazi atrocities and implementing the reparations program, the Wiedergutmachungsabkommen, with the newly formed nation of Israel. The social theorist Theodor Adorno wrote in his 1959 essay “Was bedeutet: Aufarbeitung der Vergangenheit?” about three subtly nuanced terms: Aufarbeitung der Vergangenheit, Verarbeitung der Vergangenheit and Vergangensheitbewältigung, in which he addresses the various ways that Germany was dealing with traumatic events from this National Socialist past. Adorno specifically demanded a constant renegotiation of the past or Verarbeitung der Vergangenheit because it is the only way forward, through which people remember the horrors and atrocities of the past and work towards not allowing those events to occur again.
This thesis applies the theoretical framework set forth by Adorno to explore efforts to engage the DDR and Stasi past after the Fall of the Wall and reunification. Specifically, it examines the concept of Verarbeitung der Vergangenheit and demonstrates how Thomas Brussig’s satirical novel Helden wie wir, and two documentary films Aus Liebe zum Volk and Das Wunder von Leipzig are examples of working upon this DDR and Stasi past. More specifically, the utilization of humor in the novel and the paralanguage modifications in the films provide insight to the feelings and emotions that individuals had about their pasts in the DDR. It is through this expression of emotion and feelings while writing and speaking about the past, which serves as the immediate moment when individuals actively working upon their pasts.
German history during the 20th century was extremely complex—containing numerous events that can be labelled horrific and traumatic. The horrors and traumas of WWII forced Germans to actively address their country’s National Socialist pasts by taking responsibility for their roles, creating a national memory about the Nazi atrocities and implementing the reparations program, the Wiedergutmachungsabkommen, with the newly formed nation of Israel. The social theorist Theodor Adorno wrote in his 1959 essay “Was bedeutet: Aufarbeitung der Vergangenheit?” about three subtly nuanced terms: Aufarbeitung der Vergangenheit, Verarbeitung der Vergangenheit and Vergangensheitbewältigung, in which he addresses the various ways that Germany was dealing with traumatic events from this National Socialist past. Adorno specifically demanded a constant renegotiation of the past or Verarbeitung der Vergangenheit because it is the only way forward, through which people remember the horrors and atrocities of the past and work towards not allowing those events to occur again.
This thesis applies the theoretical framework set forth by Adorno to explore efforts to engage the DDR and Stasi past after the Fall of the Wall and reunification. Specifically, it examines the concept of Verarbeitung der Vergangenheit and demonstrates how Thomas Brussig’s satirical novel Helden wie wir, and two documentary films Aus Liebe zum Volk and Das Wunder von Leipzig are examples of working upon this DDR and Stasi past. More specifically, the utilization of humor in the novel and the paralanguage modifications in the films provide insight to the feelings and emotions that individuals had about their pasts in the DDR. It is through this expression of emotion and feelings while writing and speaking about the past, which serves as the immediate moment when individuals actively working upon their pasts.
ContributorsDietz, Dominik (Author) / Gilfillan, Daniel (Thesis advisor) / Alexander, John (Committee member) / Benkert, Volker (Committee member) / Arizona State University (Publisher)
Created2016