RX FIFO status
USED | Number of entries in the RX FIFO. The field value is in the range [0, 255]. When this is zero, the RX FIFO is empty. |
RD_PTR | RX FIFO read pointer: RX FIFO location from which a data frame is read by the host.This field is used only for debugging purposes. |
WR_PTR | RX FIFO write pointer: RX FIFO location at which a new data frame is written by the hardware.This field is used only for debugging purposes. |