• Title/Summary/Keyword: memory controller

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Availability Analysis of Xilinx 7-Series FPGA against Soft Error (Xilinx 7-Series FPGA의 소프트 에러에 대한 가용성 분석)

  • Ryu, Sang-Moon
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2016.10a
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    • pp.655-658
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    • 2016
  • Xilinx 7-Series FPGA(Field Programmable Gate Array)s mainly used for the implementation of high-performance digital circuit have SRAM-type configuration memory and can malfunction when soft errors occur in their configuration memory. SEM(Soft Error Mitigation Controller) offered by Xilinx helps users mitigate the influence of soft errors in configuration memory. When soft errors occur, SEM Controller can recover the state of FPGA through partial reconfiguration if the soft errors are correctable by ECC(Error Correction Code) and CRC(Cyclic Redundancy Code). This paper presents the availability analysis of Xilinx 7-Series FPGAs against soft errors under the protection of the SEM Controller. Availability functions are derived and compared according to the correction capability of the SEM Controller. The result may help to estimate the reliability of SRAM-based FPGA running in an environment where soft errors may occur.

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VLSI Architecture of General-purpose Memory Controller for Multiple Processing (다수의 프로세싱 유닛 처리를 위한 범용 메모리 제어기의 구조)

  • Lee, Yoon-Hyuk;Seo, Young-Ho;Kim, Dong-Wook
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.15 no.12
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    • pp.2632-2640
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    • 2011
  • In this paper, we implemented a memory controller which can accommodate data processing blocks. The memory controller is arbitrated by the internal arbiter which receives request signals from masters and sends grant and data signals to masters. The designed memory controller consists of Master Interface, Master Arbitrator, Memory Interface, Memory accelerator. It was designed using VHDL, and verified using the memory model of SAMSING Inc. For FPGA synthesis and verification, Quartus II of ATERA Inc. was used. The target device is Cyclone II. For simulation, ModelSim of Cadence Inc was used.

A Design of high performance SDRAM Controller for SoC design (SoC 설계용 고성능 SDRAM Controller 설계)

  • 권오현;양훈모;이문기
    • Proceedings of the IEEK Conference
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    • 2003.07b
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    • pp.1209-1212
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    • 2003
  • In this paper, we propose a SDRAM Controller. The SDRAM is often used a mainstream memory as embedded system memory due to its short latency, burst access and pipeline features. The proposed Controller provides essential functions for SDRAM initialization, read/write accesses, memory refresh and Burst access. Furthermore, the proposed controller is implemented in the form of SOFT IP. Therefore, it reduces the designer's effort greatly.

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Memory Controller Architecture with Adaptive Interconnection Delay Estimation for High Speed Memory (고속 메모리의 전송선 지연시간을 적응적으로 반영하는 메모리 제어기 구조)

  • Lee, Chanho;Koo, Kyochul
    • Journal of IKEEE
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    • v.17 no.2
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    • pp.168-175
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    • 2013
  • The delay times due to the propagating of data on PCB depend on the shape and length of interconnection lines when memory controllers and high speed memories are soldered on the PCB. The dependency on the placement and routing on the PCB requires redesign of I/O logic or reconfiguration of the memory controller after the delay time is measured if the controller is programmable. In this paper, we propose architecture of configuring logic for the delay time estimation by writing and reading test patterns while initializing the memories. The configuration logic writes test patterns to the memory and reads them by changing timing until the correct patterns are read. The timing information is stored and the configuration logic configures the memory controller at the end of initialization. The proposed method enables easy design of systems using PCB by solving the problem of the mismatching caused by the variation of placement and routing of components including memories and memory controllers. The proposed method can be applied to high speed SRAM, DRAM, and flash memory.

Development of Error-Corrector Control Algorithm for Automatic Error Detection and Correction on Space Memory Modules (우주용 메모리의 자동 오류극복을 위한 오류 정정기 제어 알고리즘 개발)

  • Kwak, Seong-Woo;Yang, Jung-Min
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.5
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    • pp.1036-1042
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    • 2011
  • This paper presents an algorithm that conducts automatic memory scrubbing operated by dedicated hardwares. The proposed algorithm is designed so that it can scrub entire memory in a given scrub period, while minimally affecting the execution of flight softwares. The scrub controller is constructed in a form of state machines, which have two execution modes - normal mode and burst mode. The deadline event generator and period tick generator are designed in a separate way to support the behavior of the scrub controller. The proposed controller is implemented in VHDL code to validate its applicability. A simple version of the controller is also applied to mass memory modules used in STSAT-3.

Design of High-Speed Image Processing System for Line-Scan Camera (라인 스캔 카메라를 위한 고속 영상 처리 시스템 설계)

  • 이운근;백광렬;조석빈
    • Journal of Institute of Control, Robotics and Systems
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    • v.10 no.2
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    • pp.178-184
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    • 2004
  • In this paper, we designed an image processing system for the high speed line-scan camera which adopts the new memory model we proposed. As a resolution and a data rate of the line-scan camera are becoming higher, the faster image processing systems are needed. But many conventional systems are not sufficient to process the image data from the line-scan camera during a very short time. We designed the memory controller which eliminates the time for transferring image data from the line-scan camera to the main memory with high-speed SRAM and has a dual-port configuration therefore the DSP can access the main memory even though the memory controller are writing the image data. The memory controller is implemented by VHDL and Xilinx SPARTAN-IIE FPGA.

Autotuning of A PID Controller Using a Saturation function Having a Memory

  • Oh, Seung-Rohk
    • Journal of IKEEE
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    • v.11 no.4
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    • pp.193-197
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    • 2007
  • We use a saturation function with memory instead of a pure saturation function to generate a limit cycle in order to find one point information of a plant in the frequency domain. The saturation function with memory is useful in the presence of noise and/or a short duration of short duration of external disturbances. We analyze the error caused by the approximation that the saturation function with memory treated as a pure saturation function. We propose a new tuning formula for PID controller which can be applied a saturation function having memory with an arbitrary memory size. We show that the proposed method is more accurate than that of the approximation method via an example.

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Availability Analysis of SRAM-Based FPGAs under the protection of SEM Controller (SEM Controller에 의해 보호되는 SRAM 기반 FPGA의 가용성 분석)

  • Ryu, Sang-Moon
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.21 no.3
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    • pp.601-606
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    • 2017
  • SRAM-based FPGAs mainly used to develop and implement high-performance circuits have SRAM-type configuration memory. Soft errors in memory devices are the main threat from a reliability point of view. Soft errors occurring in the configuration memory of FPGAs cause FPGAs to malfunction. SEM(Soft Error Mitigation) Controllers offered by Xilinx can mitigate the influence of soft errors in configuration memory. SEM Controllers use ECC(Error Correction Code) and CRC(Cyclic Redundancy Code) which are placed around the configuration memory to detect and correct the errors. The correction is done through a partial reconfiguration process. This paper presents the availability analysis of SRAM-based FPGAs against soft errors under the protection of SEM Controllers. Availability functions were derived and compared according to the correction capability of SEM Controllers of several different families of FPGAs. The result may help select an SRAM-based FPGA part and estimate the availability of FPGAs running in an environment where soft errors occur.

Performance Improvement Method of Multi-Port Memory Controller Using An Effective Multi-Channel Direct memory Access Management (효과적인 다채널 직접 메모리 접근 관리를 통한 멀티포트 메모리 컨트롤러의 성능 향상 방법)

  • Chun, Ik-Jae;Lyuh, Chun-Gi;Roh, Tae Moon;Lee, Moon-Sik
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.4
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    • pp.33-41
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    • 2014
  • This paper presents an effective memory access method for a high-speed data transfer on mobile systems using a direct memory access controller that considers the characteristics of a multi-port memory controller. The direct memory access controller has an integrated channel management function to control multiple direct memory access channels. The channels are physically separated and operate independently from each other. Experimental results show that the proposed direct memory access method improves the transfer performance by up to 72% and 69% on read and write transfer cycles, respectively. The total number of transfer cycles of the proposed method is 63% less than in a commercial method under 4-channel access.

VLSI Architecture of General-purpose Memory Controller with High-Performance for Multiple Master (다중 마스터를 위한 고성능의 범용 메모리 제어기의 구조)

  • Choi, Hyun-Jun;Seo, Young-Ho;Kim, Dong-Wook
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.15 no.1
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    • pp.175-182
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    • 2011
  • In this paper, we implemented a high-performence memory controller which can accommodate processing blocks(multiple masters) in SoC for video signal processing. The memory controller is arbitrated by the internal arbiter which receives request signals from masters and sends grant and data signals to masters. The designed memory controller consists of Master Selector, Mster Arbiter, Memory Signal Generator, Command Decoder, and memory Signal Generator. It was designed using VHDL, and verified using the memory model of SAMSING Inc. For FPGA synthesis and verification, Quartus II of ATERA Inc. was used. The target device is Cyclone II. For simulation, ModelSim of Cadence Inc was used. Since the designed H/W can be stably operated in 174.28MHz, it satisfies the specification of SDRAM technology.