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About DMA functions in TM4C1294NCPDT

Other Parts Discussed in Thread: TM4C1294NCPDT

We use TM4C1294NCPDT mcu, and debug SPI function, so the DMA is used.

Question 1:

1) In the SPI driver (\tirtos_tivac_2_16_01_14\products\tidrivers_tivac_2_16_01_13\packages\ti\drivers\spi), there is an interrupt handler function SPITivaDMA_hwiFxn(), in this function, the DMA interrupt status(UDMA_CHIS) register will be read, its address is 0x400FF504, but in TM4C1294NCPDT datasheet, there is no information about the DMA interrupt status register (UDMA_CHIS), how to understand it? 

2) When SPI register QSSI Masked Interrupt Status (SSIMIS) is 0x10, which shows there is a DMA receive interrupt, but in this time, the register 0x400FF504 is 0. How can i get the interrupt status from DMA registers?