JESD204B接口协议中的8B/10B解码器设计

JESD204B是一种用于数据转换器和逻辑器件内部高速互连的行业新标准,可支持高达12.5 Gbit/s的多通道同步和串行数据传输。设计和实现了一种符合JESD204B协议规范的8B/10B解码器,除了能够正确解码外,还包括控制字符、判断电路、数据极性检测和错误码字检测电路。利用极性信息简化了解码电路,利用组合逻辑提高了检错和极性检测速度,采取并行处理的拓扑结构加快了电路运行速度。跟其他典型电路相比,在芯片面积上缩小了近50%,最高工作频率提高了25%,满足JESD204B协议的指标要求。     

8B/10B编解码的IP核设计

研究了8B/10B编码的编码特点和内在相关性,并在此基础上介绍了一种用Verilog HDL设计8B/10B编解码逻辑描述的方法,将其嵌入到FPGA中或设计成ASIC,可构成一个资源使用少、速度快、可靠性高的IP核.文中着重介绍8B/10B编解码总体设计方案,详细描述其内部工作原理和实现.最后给出在Altera公司软件平台QuartusⅡ上进行EDA的综合和仿真结果.     

一种新的8B/10B编解码方案设计与实现

对现有不同的8B/10B编解码方案进行了介绍和分析,同时研究8B/10B的编码特点和内在相关性,在此基础上提出一种可移植性SB/10B编解码方法,用VHDL语言进行设计,给出了仿真和综合结果.将其嵌入到FPGA中可构成一个资源占用少、速度快、可靠性高、可移植的IP核,实现了具体的硬件电路,验证了设计方法的有效性和可行性.     

JESD204B接口协议中的8B10B编码器设计

JESD204B作为SERDES接口的最新标准协议,相较于传统的接口标准,在众多方面有着明显的优势,可支持高达12.5Gbps的多通道同步和串行数据传输。基于JESD204B接口协议设计和实现了一种新型8B10B编码器。利用极性信息简化编码码表;利用3B4B与5B6B并行编码提升电路工作频率;利用人为加入一位均衡信息,减少逻辑处理层数。同时对协议规定之外的控制字节作以特殊处理。仿真结果表明,该电路完全符合协议规范,并在电路面积、功耗及最大工作频率等方面具有一定优越性。     

Bidirectional hybrid OFDM based Wireless-over-fiber transport system using reflective semiconductor amplifier and polarization multiplexing technique

In this paper, a bidirectional hybrid OFDM based Wireless-over-fiber architecture has been investigated and demonstrated to transmit 10 Gbps as well as 6.25 Gbps OFDM data for downlink transmission and 5 Gbps as well as 2.5 Gbps OFDM data for uplink transmission over 50-km single mode fiber (SMF) employing polarization multiplexing technique (POLMUX) at optical line terminal (OLT) and optical network unit (ONU). The POLMUX technique is exercised by polarization beam splitters and polarization beam combiners. Mach-Zehnder modulator and RSOA have been used for modulation at OLT and ONU respectively. Transmission performances are observed by constellation diagrams, EVM and BER values. For 10 Gbps, 6.25 Gbps down-link signal and 5 Gbps, 2.5 Gbps up-link signal the power penalty of 3 dBm, 2.3 dBm and 4 dBm, 3.2 dBm at a BER of 10⁻⁹ between back-to-back and over 50-km SMF plus 10-m and 5-m wireless link, are observed respectively. For 32-QAM < 10.5% EVM and for 16-QAM < 13% EVM are recorded. Our architecture is a prominent alternative, not only due to its have potential of both optical and wireless technology but also it is offers a powerful platform to communicate high data rates and support various type of future unforeseen applications and services.     

一种新的光纤通信8B/10B编解码实现方法研究

本文研究了8B／10B编码规则及其内在相关性，提出了一种查表和逻辑运算相结合的新的8B／10B编、解码方法，具有运算量小、编解码同步好、速度快、可靠性高等优点。该方法通过硬件描述语言Verilog HDL实现编解码算法的描述，并通过高性能的FPGA器件进行仿真和综合，实现了具体的硬件电路，并验证了设计方法的有效性和可行性。采用该方法可实现不同速率的高速8B／10B编解码模块或芯片的设计。     

一种雷达信号处理芯片的8B／10B编码电路设计

为满足某雷达信号处理芯片与系统中其他功能单元的高速互联,在芯片中专门设计了Ser—Des接口模块,并对其核心部件8B／10B编码器进行了重点设计和Verilog实现¨0。根据8B／lOB编码理论对编码电路进行模块划分和逻辑优化,尤其是将数据字符编码模块d—code划分为5B／6B、3B／4B编码查找表和逻辑输出模块。其...     

一种用于1000BASE-X物理层的8B/10B编码器设计

介绍了1000BASE-X物理编码层和物理层系统的设计,为了解决高速光纤传输过程中基线漂移和码流不平衡的问题,1000BASE-X物理编码层采用8B/10B编码算法。基于8B/10B编码规则和8B/10B编码内在相关性的分析研究,设计了一种查表法和组合逻辑法相结合的8B/10B编码器,通过硬件语言Verilog HDL实现了编码算法,并在QuartusII和Modelsim上进行综合和功能仿真验证,仿真结果表明该方法的逻辑资源面积占用小、编码速度快、可靠性高。     

光纤通道8B/10B编码的ASIC研究与设计

在目前的高速串行数据传输中广泛采用的是8B/10B编解码,为了达到简化实现结构,用于大规模集成电路的目的,研究了现有各种不同的8B/10B编解码的特点和内在相关性,并在此基础上介绍了用一种VHDL设计8B/1B编码逻辑描述的方法,将其设计成专用集成电路或嵌入到FPGA中,构成一个逻辑运算量小,速度快,可靠性高的IP核,最后给出在Altera公司软件平台Quartus Ⅱ上进行的EDA综合仿真结果。该测试结果为采用本方法设计不同速率的超高速编解码芯片奠定了基础。     

GaAs DCFL 2.5 Gbps 16-bit Multiplexer/Demultiplexer LSI's

GaAs 2.5 Gbps 16 bit MUX/DEMUX LSI's have been successfully developed. DCFL is employed as a basic gate in order to reduce the power dissipation. To avoid the speed degradation caused by using DCFL, various technologies such as 8×2(MUX)/2×8(DEMUX) data conversion processes, a Selector Merged Shift Register, clock overlapping, and a 0.7-μm BPLDD MESFET, have been introduced. Moreover the ECL I/O level interface and single power supply features make it easy to use MUX/DEMUX in optical communication systems. The maximum operating data rate is 3.2 Gbps for both LSI's, and the power dissipation of chips which operates with 2.5 Gbps are as low as 1.3 W for each MUX/DEMUX     

A 1.7 Gbps DLL‐Based Clock Data Recovery for a Serial Display Interface in 0.35‐μm CMOS

This paper presents a delay‐locked‐loop–based clock and data recovery (CDR) circuit design with a nB(n+2)B data formatting scheme for a high‐speed serial display interface. The nB(n+2)B data is formatted by inserting a ‘01’ clock information pattern in every piece of N‐bit data. The proposed CDR recovers clock and data in 1:10 demultiplexed form without an external reference clock. To validate the feasibility of the scheme, a 1.7‐Gbps CDR based on the proposed scheme is designed, simulated, and fabricated. Input data patterns were formatted as 10B12B for a high‐performance display interface. The proposed CDR consumes approximately 8 mA under a 3.3‐V power supply using a 0.35‐μm CMOS process and the measured peak‐to‐peak jitter of the recovered clock is 44 ps.     

基于 JESD204B 协议的雷达视频信号同步传输设计与实现

以宽带测向接收机中多波束比幅测向为背景,设计了基于JESD204B协议的高速背板视频信号同步传输方案。时钟、JESD204B协议参数的设计合理,实现了2块多通道视频幅度采集板与1块数据处理板之间线速率为6．25 Gbps的高速同步传输,解决了多波束比幅测向前多通道视频信号传输同步问题。     

千兆以太网中8B/10B线路码的功率谱分析

该文根据有限状态机模型,采用Cariolaro算法(1983)即状态转移矩阵求解法分析了千兆以太网中8B/10B线路码的功率谱,给出了P=0.5时的闭合解析式及功率谱曲线。     

B3G系统吉比特互联通道设计与实现

B3G移动通信系统中,如何为系统中诸多的处理、控制单元提供一种高效、高带宽的互联通道,成为系统设计中极具挑战性的研究点。提出了一种改进的串行吉比特互联构架与实现方案,并在设计中引入缓冲池解决了通道失效引发的丢帧问题,以先进的通信计算机构架ATCA为平台,应用Xilinx公司FPGA内嵌的RocketIO实现了B3G单元高速互联。系统测试表明,各单元互联通道速率达2Gbps,误码率低于10-12。     

CMOS analog MAP decoder for (8,4) Hamming code

Design and test results for a fully integrated translinear tail-biting MAP error-control decoder are presented. Decoder designs have been reported for various applications which make use of analog computation, mostly for Viterbi-style decoders. MAP decoders are more complex, and are necessary components of powerful iterative decoding systems such as turbo codes. Analog circuits may require less area and power than digital implementations in high-speed iterative applications. Our (8, 4) Hamming decoder, implemented in an AMI 0.5-/spl mu/m process, is the first functioning CMOS analog MAP decoder. While designed to operate in subthreshold, the decoder also functions above threshold with a small performance penalty. The chip has been tested at bit rates up to 2 Mb/s, and simulations indicate a top speed of about 10 Mb/s in strong inversion. The decoder circuit size is 0.82 mm/sup 2/, and typical power consumption is 1 mW at 1 Mb/s.     

Fast-Converging and Low-Power LDPC Decoding: Algorithm,Architecture, and VLSI Implementation

Low-latency and energy-efficient multi-Gbps LDPC decoding requires fast-converging iterative schedules. Hardware decoder architectures based on such schedules can achieve high throughput at low clock speeds, resulting in reduced power consumption and relaxed timing closure requirements for physical VLSI design. In this work, a fast column message-passing (FCMP) schedule for decoding LDPC codes is presented and investigated. FCMP converges in half the number of iterations compared to existing serial decoding schedules, has a significantly lower computational complexity than residual-belief-propagation (RBP)-based schedules, and consumes less power compared to state-of-the-art schedules. An FCMP decoder architecture supporting IEEE 802.11ad (WiGig) LDPC codes is presented. The decoder is fully pipelined to decode two frames with no idle cycles. The architecture is synthesized using the TSMC 40 nm and 65 nm CMOS technology nodes, and operates at a clock-frequency of 200 MHz. The decoder achieves a throughput of 8.4 Gbps, and it consumes 72 mW of power when synthesized using the 40 nm technology node. This results in an energy efficiency of 8.6 pJ/bit, which is the best-reported energy-efficiency in the literature for a WiGig LDPC decoder.

     

一种低延时的多通道8B/10B编码器设计

针对当前10 Gb/s以上高速SerDes接口中的8B/10B编码需求,在传统的多通道编码器上对其结构进行改进,加入了极性快速产生模块,降低了编码器内部通道的等待时间,提升了并行编码的效率,在提高了数据传输速率的同时,降低了编码输出延时。电路的仿真结果表明:编码器在四通道与八通道模式下,数据传输速率分别达到了20.6 Gb/s与38.4 Gb/s,编码输出延时均为1个时钟周期,填补了国内低延时高速8B/10B编码器的空白。     

An FPGA Implementation of High‐Speed Flexible 27‐Mbps 8‐StateTurbo Decoder

In this paper, we propose a flexible turbo decoding algorithm for a high order modulation scheme that uses a standard half‐rate turbo decoder designed for binary quadrature phase‐shift keying (B/QPSK) modulation. A transformation applied to the incoming I‐channel and Q‐channel symbols allows the use of an off‐the‐shelf B/QPSK turbo decoder without any modifications. Iterative codes such as turbo codes process the received symbols recursively to improve performance. As the number of iterations increases, the execution time and power consumption also increase. The proposed algorithm reduces the latency and power consumption by combination of the radix‐4, dual‐path processing, parallel decoding, and early‐stop algorithms. We implement the proposed scheme on a field‐programmable gate array and compare its decoding speed with that of a conventional decoder. The results show that the proposed flexible decoding algorithm is 6.4 times faster than the conventional scheme.     

8B/10B编码器的设计及实现

本文介绍了8B/10B编码技术,提出了一种简单、实用的8B/10B编码器的实现方法,并且采用Verilog语言设计了一种通用的软核。通过在FPGA器件上进行测试,电路稳定、可靠,可直接嵌入到需要8B/10B编码功能的收发器电路中。     

A 4 Gbps current-mode transmitter for 12-bit 250 MSPS ADC

A 4 Gbps transmitter for a 12-bit 250 MSPS pipelined ADCs is presented. A low power current mode (CM) output driver with reverse scaling technique is proposed. A high speed, low power combined serializer is implemented to convert 12 bit parallel data into a seria1 data stream. The whole transmitter is used in a 12-bit 250 MSPS pipelined ADC for the digital output buffer and fabricated in 180 nm 1. 8 V 1P5M CMOS technology. Test results show that the transmitter provides an eye height greater than 800 mV for data rates of both 2 Gbps and 4 Gbps, the 12-bit 250 MSPS ADC achieves the SNR of 69.92 dBFS and SFDR of 81.17 dB with 20.1 MHz input at full sampling speed. The ADC with the 4 Gbps transmitter consumes the power consumption of 395 mW, where the power consumption of transmitter is 75 mW. The ADC occupies an area of 2.5×3.2 mm², where the active area of the transmitter block is 0.5×1.2 mm².