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用差分接口扩展SPI的距离

更新时间:2019-11-18 14:54:03 大小:1M 上传用户:xuzhen1查看TA发布的资源 标签:接口spi 下载积分:0分 评价赚积分 (如何评价?) 打赏 收藏 评论(0) 举报

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Figure 1 depicts a typical SPI which consists of four lines; SPICLK, SIMO, SOMI, and SS. In this configuration, one device acts as a master while the other acts as a slave. The master provides clock(SPICLK), slave in master out (SIMO), and slave select(SS). The slave provides data to the master via the slave-out-master-in (SOMl) line. The master controls the data flow over theSPI, since data can only flow when both the SS is low(active low) and the clock is present. Data flow is bidirectional(duplex) in the configuration of Figure 1.

Data flow can also be unidirectional(simplex). In a simplex configuration, the SPI is missing either SOMI or SIMO, and the SPI is simply a means for the slave to talk to the master or the master to the slave. This is why some SPIs only have three lines; SPICLK, SS, and SIMO or SOMl.


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