An Energy-Efficient and High-Speed Mobile Memory I/O Interface Using Simultaneous Bi-Directional Dual (Base+RF)-Band Signaling

Byun, Gyung-Su; Kim, Yanghyo; Kim, Jongsun; Tam, Sai-Wang; Chang, Mau-Chung Frank

doi:10.1109/jssc.2011.2164709

Cited by 44 publications

(21 citation statements)

References 15 publications

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“…Our latest MRF-I inter-channel interference suppression scheme [15] showed single-ended multi-band signaling communication between a point-to-point TL connection. We believe development of a multi-drop 4-ASK MRF-I is possible using an on-chip transformer-based band-bass filter [5] and an improved inter-channel interference suppression scheme [15]. In our simulation, multi-drop MRF-I can work up to 4 G/b/pin per band with a 5 cm TL.…”

Section: Current State Of Mrf-imentioning

confidence: 88%

“…The figure shows that we can continue to maintain the lower energy per bit at higher data rates by adding more RF bands (in turn, by maintaining the linear power-consumption versus bandwidth region in each of the multiple RF-bands, as well as limiting the BB-only interconnect operation within its linear-power consumption region versus the bandwidth). The energy efficiency (dotted lines) of 4ASK and 8ASK was projected by using both measured DBI power numbers [4], [5], [15] and simulation results.…”

Section: B Overhead Of Using Mrf-imentioning

confidence: 99%

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Utilizing Radio-Frequency Interconnect for a Many-DIMM DRAM System

Therdsteerasukdi

Byun

et al. 2012

IEEE J. Emerg. Sel. Topics Circuits Syst.

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Abstract-The demand for capacity and off-chip bandwidth to dynamic random-access memory (DRAM) will continue to grow as we integrate more cores onto a die. However, as the data rate of DRAM has increased, the number of dual in-line memory modules (DIMMs) supported on a multi-drop bus has decreased. Therefore, traditional memory systems are not sufficient to meet both these demands. We propose the DIMM tree architecture for better scalability by connecting the DIMMs as a tree. The DIMM tree architecture is able to grow the number of DIMMs exponentially with each level of latency in the tree. We also propose application of multiband radio-frequency interconnect (MRF-I) to the DIMM tree architecture for even greater scalability and higher throughput. The DIMM tree architecture without MRF-I was able to scale up to 64 DIMMs with only an 8% degradation in throughput over an ideal system. The DIMM tree architecture with MRF-I was able to increase throughput by 68% (up to 200%) on a 64-DIMM system over a 4-DIMM system. Finally, we propose the partitioned DIMM tree, which allows the scaling of a main memory system to a many-DIMM memory system while still maintaining high throughput. The partitioned DIMM tree is able to improve throughput by an average of 19% up to 35% over the DIMM tree with 256 DIMMs on a single channel.Index Terms-Integrated circuit interconnections, memory architecture, radio-frequency integrated circuits, random access memory.

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Section: Current State Of Mrf-imentioning

confidence: 88%

Section: B Overhead Of Using Mrf-imentioning

confidence: 99%

Utilizing Radio-Frequency Interconnect for a Many-DIMM DRAM System

Therdsteerasukdi

Byun

et al. 2012

IEEE J. Emerg. Sel. Topics Circuits Syst.

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“…From Fig. 5(a), if a single pulse with the period of " " is mixed with a carrier signal, the input signal of the channel will be described as (16) In order to utilize the property of convolution, (16) is converted in the Laplace domain (17) Therefore, the output of the channel becomes a multiplication of channel response and modulated input signal where accounts for the phase shift given in (13).…”

Section: B Transient Response Through T-linementioning

confidence: 99%

Analysis of Noncoherent ASK Modulation-Based RF-Interconnect for Memory Interface

Kim

Tam

Byun

et al. 2012

IEEE J. Emerg. Sel. Topics Circuits Syst.

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Abstract-A noncoherent amplitude shift keying (ASK)-based RF-interconnect (RF-I) system design for off-chip communication is analyzed. The proposed RF-I system exploits the simple architecture and characteristics of noncoherent ASK modulation. This provides an efficient way of increasing interconnect bandwidth by transmitting an RF-modulated data stream simultaneously with a conventional baseband counterpart over a shared off-chip transmission line. Both analysis and tested results prove that the performance of the proposed dual-band (RF+baseband) interconnect system is not limited by thermal noise interference. Therefore, a more sophisticated modulation scheme and/or coherent receiving scheme becomes unnecessary within the scope of system requirements. In addition, it confirms that the proposed inductive coupling network is able to support simultaneous bidirectional communications without using complicated replica circuits or additional filters to isolate simultaneous baseband and RF-band data streams.Index Terms-Dual-band signaling, inductive coupling, memory interface, noncoherent amplitude shift keying modulation, RF-interconnect, simultaneous bidirectional communication.

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“…The ASK modulation/demodulation scheme, for both RF-band and baseband transceiver, was presented. This design is realized on future mobile memory I/O interface for energy efficient [5]. However, BPSK is as well as showing better Bit Error Rate (BER) compared to BASK.…”

Section: Introductionmentioning

confidence: 99%

FPGA-based BASK and BPSK Modulators Using VHDL: Design, Applications and Performance Comparison for Different Modulator Algorithms

Sönmez¹,

Akbal²

2012

IJCA

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This paper presents the simulation results of binary digital modulation schemes. In this paper, for BASK and BPSK modulation techniques used FPGA algorithm, multiplier don't using. If multiplier block is used for multiplication bit stream with carrier signal, used time will rises. In addition using multiplier block obtained simulation results were analyzed and compared to other simulation results. Source consumptions of FPGA-based BASK modulation technique and BPSK modulation technique were compared. Also, for different modulation algorithm, source consumptions of BASK and BPSK modulation technique were analyzed using VHDL and Quartus 9.2 complier. Designed modulators using VHSIC (Very High Speed Integrated Circuit) Hardware Description Language (VHDL) was realized on high speed FPGA (Field Program Programmable Gate Array). Because for used modulation technique data rate transfer is fairly important in wireless communication systems. The highest speed data rate transfer can be realized using fiber optic cables. In addition, BER (Bit Error Rate) of BASK and BPSK modulator was compared using MATLAB simulation program. Binary data rate is same for BPSK and BASK. BPSK and BASK modulations were designed on FPGA using VHDL hardware description language.

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An Energy-Efficient and High-Speed Mobile Memory I/O Interface Using Simultaneous Bi-Directional Dual (Base+RF)-Band Signaling

Cited by 44 publications

References 15 publications

Utilizing Radio-Frequency Interconnect for a Many-DIMM DRAM System

Utilizing Radio-Frequency Interconnect for a Many-DIMM DRAM System

Analysis of Noncoherent ASK Modulation-Based RF-Interconnect for Memory Interface

FPGA-based BASK and BPSK Modulators Using VHDL: Design, Applications and Performance Comparison for Different Modulator Algorithms

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