- trig signal will reset state machine
- slrd_n delay will be absorbed by the axi_usb_fx3_if module, when Xilinx DMA is not ready to receive data during a packet
- fx32dma_eop signals when the FX3 DMA buffer should be empty. slrd_n set high and sloe_n set low for another two clock cycles
- eot_fx32dma signals the interface that the packet has been fully transfered. No need for watermark signals
- added length_fx32dma and length_dma2fx3 as requested