isp1760 NXP Semiconductors, isp1760 Datasheet - Page 12

• Manufacturer Part Number: isp1760
• Description: Hi-speed Universal Serial Bus Host Controller For Embedded Applications
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7. Functional description
9397 750 13257
Product data sheet
7.1 ISP1760 internal architecture: Advanced Philips Slave Host Controller
and hub
The EHCI block and the Hi-Speed USB hub block are the main components of the
Advanced Philips Slave Host Controller.
The EHCI is the latest generation design, with improved data bandwidth. The EHCI in the
ISP1760 is adapted from Enhanced Host Controller Interface Specification for Universal
Serial Bus Rev. 1.0 .
The internal Hi-Speed USB hub block replaces the companion Host Controller block used
in the original PCI Hi-Speed USB Host Controllers to handle the full-speed and low-speed
modes. The hardware architecture in the ISP1760 is simplified to help reduce cost and
development time, by eliminating the additional work involved in implementing the OHCI
software required to support the full-speed and low-speed modes.
Figure 3
EHCI that has an internal port—the Root Hub port (not available externally)—on which the
internal hub is connected. The three external ports are always routed to the internal hub.
The internal hub is a Hi-Speed USB (USB 2.0) hub including the TT.
Remark: The root hub must be enabled and the internal hub must be enumerated.
Enumerate the internal hub as if it is externally connected. For details, refer to ISP176x
Linux Programming Guide (AN10042) .
At the Host Controller reset and initialization, the internal Root Hub port will be polled until
a new connection is detected, showing the connection of the internal hub.
The internal Hi-Speed USB hub is enumerated using a sequence similar to a standard
Hi-Speed USB hub enumeration sequence, and the polling on the Root Hub is stopped
because the internal Hi-Speed USB hub will never be disconnected. When enumerated,
the internal hub will report the three externally available ports.
shows the internal architecture of the ISP1760. The ISP1760 implements the
Rev. 01 — 8 November 2004
Embedded Hi-Speed USB host controller
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
ISP1760
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