ISP1521

ISP1521 Hi-Speed Universal Serial Bus hub controller Rev. 03 — 24 November 2004 Product data 1. General description The ISP1521 is a stand-alone Universal Serial Bus (USB) hub controller IC that complies with Universal Serial Bus Specification Rev. 2.0. It supports data transfer at high-speed (480 Mbit/s), full-speed (12 Mbit/s) and low-speed (1.5 Mbit/s). The upstream facing port can be connected to a Hi-Speed USB host or hub or to an Original USB host or hub. If the upstream facing port is connected to a Hi-Speed USB host or hub, then the ISP1521 will operate as a Hi-Speed USB hub. That is, it will support high-speed, full-speed and low-speed devices connected to its downstream facing ports. If the upstream facing port is connected to an Original USB host or hub, then the ISP1521 will operate as an Original USB hub. That is, high-speed devices that are connected to its downstream facing ports will operate in full-speed mode instead. The ISP1521 is a full hardware USB hub controller. All Original USB devices connected to the downstream facing ports are handled using a single Transaction Translator (TT), when operating in a cross-version environment. This allows the whole 480 Mbit/s upstream bandwidth to be shared by all the Original USB devices on its downstream facing ports. The ISP1521 has seven downstream facing ports. If not used, ports 3 to 7 can be disabled. The vendor ID, product ID and string descriptors on the hub are supplied by the internal ROM; they can also be s...