FIFO memory devices are configured to support a pair of hybrid operating
modes that enable the FIFO memory device to be depth-expandable with
other FIFO memory devices in a collective standard mode of operation. The
pair of hybrid operating modes including a first hybrid mode that
supports a write interface configured in standard mode and a read
interface configured in first-word fall-through (FWFT) mode and a second
hybrid mode that supports a write interface configured in FWFT mode and a
read interface configured in standard mode.