ISP1760ET,557 NXP Semiconductors, ISP1760ET,557 Datasheet - Page 14



Manufacturer Part Number
NXP Semiconductors

Specifications of ISP1760ET,557

Package Type
Pin Count
Lead Free Status / RoHS Status
NXP Semiconductors
7. Functional description
Product data sheet
7.1 ISP1760 internal architecture: advanced NXP slave host controller
and hub
The EHCI block and the Hi-Speed USB hub block are the main components of the
advanced NXP slave host controller.
The EHCI is the latest generation design, with improved data bandwidth. The EHCI in the
ISP1760 is adapted from
Universal Serial Bus Rev.
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 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 full-speed and low-speed modes.
Figure 4
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
“Interfacing the ISP176x to the Intel PXA25x processor
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. 04 — 4 February 2008
Ref. 2 “Enhanced Host Controller Interface Specification for
Embedded Hi-Speed USB host controller
© NXP B.V. 2008. All rights reserved.
Ref. 5
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