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It is not common to unload a FIFO when the this one is empty or not full, so please add the CONTROL_2.DN bit to the FIFO unload, I do not see why you use TIMER1 to unload your FIFO without being synchronized with FIFO loading.
I know this is not exactly what you´re looking for, but this AOI will help you, you can find it at AB web page. Take a look at the attached file. Bill AOI_PF700_VR_AXIS_SC_Information.pdf