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光纤卡解决方案——Ameya360电子元器件平台
Release time：2020-06-12
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source：Ameya360
reading：1685
1、前言
光纤卡，指的是光纤以太网适配器，通过以太网通信协议传输，一般通过光纤线缆与光纤以太网交换机连接。存储系统的 I/O 通道实际上就是光纤通道。而 HBA 的作用就是实现内部通道协议 PCI 或 Sbus 和光纤通道协议之间的转换。
2、方案概述
Ameya360 光纤卡解决方案根据《PMC 光纤通信卡技术要求》， 光纤通信卡在嵌入式系统中完成大容量数据的高速传输， 设计为子卡形式， 对外提供标准接口和四 FC 通道。 每路 FC 通道提供至少 2.125Gbps 的峰值数据传输速率， 由于 FC 协议是使用 8b/10b 变换原则进行数据编码，有效数据速率为 200MB/s。假如两个通道同时通信或者将通道传输速率升级至 4.25Gbps，则需要 PMC 接口达到 400 MB/s 的接口传输速率，因此接口采用标准的 66MHz 64bit PCI 协议进行通信，峰值传输速率为 528MB/s。主要由 PMC 接口单元、 控制单元、 存储器单元、FC 接口单元、调试单元和电源时钟单元组成。
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