read data line的意思|示意

The data ready line can be used to flag the processor when a keystroke is ready to be read .

当按下的键准备读出时，数据准备线可用来作处理器的标志。

Xargs reads data from a pipe and runs a specified command for every line read.

xargs命令可从管道中读取数据并为每行读取内容运行指定命令。

The host changes the data line only when the Clock line is low, and data is read by the device when Clock is high.

只有当时钟线为低的时候，主机才可以改变数据线(也就是将数据写入到数据线)。数据将在时钟为高电平的时候被设备读龋。