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CC3200中的FIFO触发等级是什么意思?



用到DMA时发现需要配置(uart dma)

    UARTFIFOLevelSet(UARTA0_BASE,UART_FIFO_TX1_8,UART_FIFO_RX1_8);

1.这个FIFO等级有什么用?我在使用串口时一定要配置么?

2.UART_FIFO_TX1_8 UART_FIFO_TX4_8,这些是什么意思,第一个是传送8个byte就产生一次中断么?FIFO最大是8个byte么?