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TMS320F28069 SCI串口接收FIFO中断

问个问题,在SCI模块中,使能FIFO接收中断,怎么才能一次读取所有的数据。

举个例子来说,我定义FIFO中断的深度为4,需要接收7个数据。因为7个数据只能触发一次中断,怎么才能在不触发第二次中断情况下读取后3个数据?如果由其他设备发送一串数据,怎样判断我已经接收完所有的数据?我查看数据手册,没发现相关的说明,请指点。