High speed USB hub with full speed to high speed transaction translator. A USB hub may include an upstream port for coupling to a host and one or more downstream ports for coupling to downstream devices. The downstream devices may operate at USB high speed. The USB hub may support hosts which operate at speeds less than high speed (e.g., full speed). Accordingly, when a host operates at a lower speed, a transaction translator may convert the communications from the host from the lower speed to the high speed. Accordingly, the downstream device may still operate at high speed even when the host operates at a lower speed.