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LAUNCHXL-F28069M SPI FIFO

Other Parts Discussed in Thread: C2000WARE你好,请教下,我用28069M的开发板,利用的是C2000中的示例,C:\ti\c2000\C2000Ware_3_03_00_00\device_support\f2806x\examples\c28\spi_loopback

其中有段fifo代码该如何理解呢?如下代码示例:
设定 SpiaRegs.SPIFFTX寄存器的值为0xE040有何特定含义吗?该如何理解其各bit位的设定呢?
设定 SpiaRegs.SPIFFRX寄存器的值为0x2044有何特定含义吗?该如何理解其各bit位的设定呢?
待您有时间可否帮忙预约解答,感谢感谢。
spi_fifo_init(void)
{
//
// Initialize SPI FIFO registers
//
SpiaRegs.SPIFFTX.all=0xE040;
SpiaRegs.SPIFFRX.all=0x2044;
SpiaRegs.SPIFFCT.all=0x0;
}