|
时间紧,工作忙,看E文总是有点不爽,我已经翻译了一小段,每个人翻译一点点,大家可以很快就合力完成了嘛!下面是中英文对照的。
7.3 Data Request Pin DREQ
The DREQ pin/signal is used to signal if VS1003’s FIFO is capable of receiving data. If DREQ is high,
VS1003 can take at least 32 bytes of SDI data or one SCI command. When these criteria are not met,
DREQ is turned low, and the sender should stop transferring new data.
Because of the 32-byte safety area, the sender may send upto 32 bytes of SDI data at a time without
checking the status of DREQ, making controlling VS1003 easier for low-speed microcontrollers.
Note: DREQ may turn low or high at any time, even during a byte transmission. Thus, DREQ should
only be used to decide whether to send more bytes. It should not abort a transmission that has already
started.
Note: In VS10XX products upto VS1002, DREQ was only used for SDI. In VS1003 DREQ is also used
to tell the status of SCI.
7.3 数据请求信号脚 DREQ
这个DREQ信号脚是反映VS1003的FIFO是否可以接收数据。如果它为高电平,
则VS1003可以接收最少32字节的SDI数据或者接收一个SCI命令。当条件不
合适的时候,DREQ会转换到低电平,此时应该停止向VS1003发送新数据。
由于32字节是一个安全的范围,发送方可以一次发送完32字节的SDI数据
之后再去检查DREQ的状态,这样就可以选择低速的单片机作为主控制器。
注意:DREQ可能在任何时间转变状态,甚至在一个字节传送的期间。因此,
DREQ最好只用来确认是否要发送较多的字节。它不应该中断一个已经开始
的发送过程。
注意:在从VS10xx到VS1002的产品内,DREQ只用于SDI。而在VS1003,DREQ
也用来反映SCI的状态。 |
阿莫论坛20周年了!感谢大家的支持与爱护!!
一只鸟敢站在脆弱的枝条上歇脚,它依仗的不是枝条不会断,而是自己有翅膀,会飞。
|