Atmel SAM9X25, Manual

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32. USB High Speed Port (UHPHS)
32.1 Description
The USB Host Port (UHP) interfaces the USB with the host application. It handles Open HCI
protocol (Open Host Controller Interface) as well as Enhanced HCI protocol (Enhanced Host
Controller Interface).
32.2 Embedded Characteristics
• Compliant with Enhanced HCI Rev 1.0 Specification
– Compliant with USB V2.0 High-speed
– Supports High-speed 480 Mbps
• Compliant with OpenHCI Rev 1.0 Specification
– Compliant with USB V2.0 Full-speed and Low-speed Specification
– Supports both Low-speed 1.5 Mbps and Full-speed 12 Mbps USB devices
• Root Hub Integrated with 2 Downstream USB Ports
• Shared Embedded USB Transceivers
• Supports Power Management
• 2 Hosts (A and B) High Speed (EHCI) and Full Speed (OHCI)
• 1 Host (C) Full Speed only (OHCI)
Figure 32-1. USB Selection
32.2.1 EHCI
The USB Host Port controller is fully compliant with the Enhanced HCI specification. The USB
Host Port User Interface (registers description) can be found in the Enhanced HCI Rev 1.0
Specification available on
http://www.intel.com/technology/usb/ehcispec.htm . The standard
EHCI USB stack driver can be easily ported to Atmel’s architecture in the same way all existing
class drivers run, without hardware specialization.
32.2.2 OHCI
The USB Host Port integrates a root hub and transceivers on downstream ports. It provides sev-
eral Full-speed half-duplex serial communication ports at a baud rate of 12 Mbit/s. Up to 127
USB devices (printer, camera, mouse, keyboard, disk, etc.) and the USB hub can be connected
to the USB host in the USB “tiered star” topology.
The USB Host Port controller is fully compliant with the Open HCI specification. The USB Host
Port User Interface (registers description) can be found in the Open HCI Rev 1.0 Specification
HS
Transceiver
DMA
HS USB Host
HS EHCI
FS OHCI
PB PA
1 0
EN_UDPHS
PC
FS
Transceiver
HS
USB
Device
HS
Transceiver
DMA