isp1563 NXP Semiconductors, isp1563 Datasheet - Page 12

• Manufacturer Part Number: isp1563
• Description: Hi-speed Universal Serial Bus Pci Host Controller
• Manufacturer: NXP Semiconductors

NXP Semiconductors
7. Functional description
ISP1563_2
Product data sheet
7.1 OHCI Host Controller
7.2 EHCI Host Controller
7.3 Dynamic port-routing logic
7.4 Hi-Speed USB analog transceivers
7.5 LED indicators for downstream ports
7.6 Power management
An OHCI Host Controller transfers data to devices at the Original USB defined bit rate of
12 Mbit/s or 1.5 Mbit/s.
The EHCI Host Controller transfers data to a Hi-Speed USB compliant device at the
Hi-Speed USB defined bit rate of 480 Mbit/s. When the EHCI Host Controller has the
ownership of a port, the OHCI Host Controllers are not allowed to modify the port register.
All additional port bit definitions required for the enhanced Host Controller are not visible
to the OHCI Host Controller.
The port-routing feature allows sharing of the same physical downstream ports between
the Original USB Host Controller and the Hi-Speed USB Host Controller. This requirement
of Enhanced Host Controller Interface Specification for Universal Serial Bus Rev. 1.0
provides four downstream ports, and these ports are multiplexed with the ports of the two
OHCIs. The first and third downstream ports are always connected to the first OHCI, and
the second and fourth downstream ports are always connected to the second OHCI.
The EHCI is responsible for the port-routing switching mechanism. Two register bits are
used for ownership switching. During power-on and system reset, the default ownership of
all downstream ports is the OHCI. The enhanced Host Controller Driver (HCD) controls
the ownership during normal functionality.
The Hi-Speed USB analog transceivers directly interface to the USB cables through
integrated termination resistors. These transceivers can transmit and receive serial data
at all data rates: high-speed (480 Mbit/s), full-speed (12 Mbit/s) and low-speed
(1.5 Mbit/s).
The system designer can program two optional port indicators, a green LED and an
amber LED, to indicate the status of the Host Controller. These port indicators are
implemented according to the USB specification.
All LED indicators are open-drain output.
The ISP1563 provides an advanced power management capability interface that is
compliant with PCI Bus Power Management Interface Specification Rev. 1.1 . Power is
controlled and managed by the interaction between drivers and PCI registers.
For a detailed description on power management, see
Rev. 02 — 15 March 2007
Section
HS USB PCI Host Controller
10.
© NXP B.V. 2007. All rights reserved.
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