October 10, 20007 USB 2.0 Host Controller Architecture: Port Routing Rules w Ports owned by Companion controllers when HS HC software is absent w When HS HC Software is present, it configures High-Speed HC then: – Retains ownership for high-speed devices – Releases individual port ownership if attached device is not high speed u Routing Logic signals a disconnect on HS HC and a connect on Companion HC – Ownership returns to HS HC on a disconnect event Companion USB 1.1 HC X Port Register High Speed HC (EHCI) (EHCI) TransceiverTransceiver Port Routing Logic Port Owner Control HC Configured Port Register
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