多协议可变位宽40 bits高速串口发射机

A high speed transmitter with 40 bits data and variable data-width and supported multi-protocols

摘要: 本文提出一种多协议, 可变位宽发射机系统, 最高数据位宽40 bits, 最高数据速率10.312 5 Gbps.整个系统由归一化数据位宽(Normalization of Data Width, NMDW)变换电路, 40:1合路器(MUX), 时钟分布电路及3抽头前馈均衡器(Feed-Forward-Equalizer, FFE)组成, 文章中提出了改进的40:1 MUX电路结构.本文采用SMIC 40 nm CMOS工艺, 电源电压1.1 V.发射机(Transmitter, TX)整体功耗34mW@10.3125 Gbps, 信道前差分输出眼图最大幅度大于800 mV.同时, 本发射机支持4种不同协议, 7种不同数据速率, 9种工作状态, 工作温度范围-45℃~125℃.

Abstract: This paper propose a system of transmitter(TX) supported multi-protocols and variable data-width, with max input data width of 40bits and data rate of 10.312 5 Gbps. The transmitter consists of Normalization of Data Width(NMDW), 40:1MUXs, distributed clock circuit and 3-taps Feed-Forward-Equalizer(FFE). This paper is proposed an improved 40:1MUXs circuit. and supported in SMIC 40nm CMOS technology, supported by 1.1 V. The power consumption of TX is 34.5mW@10.312 5 Gbps. The differential eye diagram is larger than 800 mV before channel. Meanwhile, TX is supported 4 different protocols, 7 different data-rate, 9 work conditions, the work temperature ranged from -45℃to 125℃.