通过设置MD[4:1],R-Car支持从以下几种方式进行启动:
— External ROM (Area 0, local bus)
— HyperFlash ROM (Max. 320Mbps per pin)
— Serial Flash ROM
— eMMC
— USB download
— SCIF and HSCIF (R-Car V3H only) as serial downloader
这里只介绍其中的几种连接方式:
— eMMC
— Serial Flash ROM
— HyperFlash ROM
项目 | eMMC | serial flash | Hyper flash |
---|---|---|---|
容量 | 大 | ||
成本 | 低 | ||
寿命 | MLC的eMMC擦除次数大概在3000~5000cyclec,而SLC的擦除次数则在25000~40000cycle | 长达20年 | |
带宽 | 读带宽~333MBps | ||
用途 | 用于各种消费品,如相机,手机等 | 存储执行code,用于DVD players, DSL modems, routers, hard-disk drives, printers。上电后,代码从serial flash被copy到RAM,并开始执行 | |
连接 |
They deliver the highest read bandwidth at 333MB/s, over five times faster than Quad SPI NOR flash with one-third the number of pins of parallel NOR flash.
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