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Designing a Hi-Speed USB host PCI adapter using the ISP1561

Posted: 07 Jun 2010 ?? ?Print Version ?Bookmark and Share

Keywords:Hi-Speed USB? PCI adapter ISP1561? PCB design recommendations?

The ISP1561 is a Hi-Speed USB host controller (HC) that can be directly connected to a standard 32bit, 33MHz PCI bus. The ISP1561 is compliant with PCI Local Bus Specification Revision 2.2 and PCI Bus Power Management Interface Specification Revision 1.1. No additional logic is necessary to implement a complete Hi-Speed USB Host Controller solution on PCI.

Adapter cards based on the ISP1561 implement three functions: function 0 and function 1 for OHCI1 and OHCI2, and function 2 for EHCI. According to the PCI Local Bus Specification, each physical PCI device may incorporate one to eight separate functions (logical devices). Each function contains its own memory-mapped individually addressable configuration space (according to the USB specification: 4Kbytes each for OHCI1 and OHCI2, and 256bytes for EHCI) containing configuration registers.

The configuration registers of the ISP1561 are used by the system's BIOS and the operating system to detect the presence of the respective functions (vendor ID and product ID), and determine the necessary resource requirements (memory and I/O space, interrupt lines, and so on) and specific capabilities.

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