FIFO has size +8bit #3
Description
The datasheet specifies the FIFO size to be 16, 24, 32 or 40 bits. However, this is wrong: It has capacity for 48 bits. When it's length is set to 40 bit, it actually expects and fires IRQ at 48 bits (and for 32 bits it fires after receiving 40 bits - not tested for lower numbers).
Also it holds 8 bit more then set - so it seems datasheet is off by 8 bit.