采用時(shí)分多址協(xié)議的光網(wǎng)絡(luò)中, 突發(fā)同步是一項(xiàng)關(guān)鍵技術(shù), 一般采用基于多相時(shí)鐘的關(guān)鍵字檢測(cè)法。基于對(duì)異步傳輸模式——無源光網(wǎng)絡(luò)的研究，提出了對(duì)AS1773協(xié)議的突發(fā)同步設(shè)計(jì)。采用了高速現(xiàn)場(chǎng)可編程門陣列的方式實(shí)現(xiàn)20 Mbps突發(fā)同步器，簡化了電路的設(shè)計(jì)，相對(duì)于傳統(tǒng)的專用集成電路設(shè)計(jì)方案設(shè)計(jì)方案，具有開發(fā)成本低、開發(fā)周期短的優(yōu)點(diǎn)。
關(guān) 鍵 詞 AS1773總線; 總線控制器; 突發(fā)同步; 遠(yuǎn)程終端
Abstract This paper Burst mode synchronization is a key techno logy in passive optical network that utilizes time division multi access (TDMA) with single mode fiber. For the clock recovery in burst mode transmission, a burst mode synchronizer using keyword detection based on multiphase clock is usually used. In this article, based on research in asynchronous transfer moder-passive optical network, author described a method to design burst synchronizer in AS1773 protocol. This synchronizer is implemented by field programmable gate array, which can achieve high performance with low cost, short developing period.
Key words AS1773; bus controller; burst synchronization; remote terminal