USB 2.0 Host Controller

The core can handle up to 15 downstream ports, where each port can handle all three USB speeds. Port routing within the core is highly configurable. The designer has choices ranging from handling Full/Low-Speed traffic with one companion controller per port, to having one companion controller handle all ports. The modularity of the core enables the designer to configure High- or Full/Low-Speed only products. Both controller types have support for big and little endian systems, with the option to adjust the register interfaces' byte order to fit the target platform.

The enhanced host controller has support for Asynchronous Park Mode to allow consecutive bulk transactions to the same endpoint and a NAK counter to limit unnecessary memory accesses. The universal host controller's interface has been extended to report over current conditions. The core supports UTMI+ 16-bit transceivers at 30 MHz and 8-bit transceivers at 60 MHz, and ULPI 8-bit transceivers at 60 MHz.

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