3 Replies Latest reply on Feb 12, 2019 3:55 AM by EktaN_26

    Data sheet for standard Motorla SPI component seems to be worded incorrectly

    JoWi_3984961

      Jan. 22, 2019

       

       

      The SPI data sheet states on page 103 of 216: (Document Number: 002-20171 Rev. *B)

       

      "

      RX FIFO

      The interrupt or DMA trigger output signal remains active until the number of data elements in the RX FIFO is greater than the value of RX FIFO level.

      For example, the RX FIFO has 8 data elements and the RX FIFO level is 0. The DMA trigger signal remains active until DMA does not read all data from the RX FIFO.

      "

      I would think it should be:

       

      RX FIFO

      The interrupt or DMA trigger output signal remains active until the number of data elements in the RX FIFO is less than (or equal to ?) the value of RX FIFO level.

      For example, the RX FIFO has 8 data elements and the RX FIFO level is 0. The DMA trigger signal remains active until DMA does read all data from the RX FIFO.

       

      Does anyone agree? And now I must question also, what happens when the number of data elements in the RX FIFO is equal to the value of the RX FIFO level?