ISP1561 データシートの表示（PDF） - Philips Electronics

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ISP1561

Hi-Speed USB PCI host controller

Philips Electronics 

Philips Semiconductors

ISP1561

USB PCI host controller

7. Functional description

7.1 OHCI Host Controller

An OHCI Host Controller transfers data to devices at the Original USB defined bit rate

of 12 Mbit/s or 1.5 Mbit/s.

7.2 EHCI Host Controller

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.

7.3 Dynamic port-routing logic

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 the Enhanced Host Controller Interface Specification provides

four downstream ports, and these ports are multiplexed with the ports of the two

OHCIs. The first and the third downstream ports are always connected to the first

OHCI, and the second and the 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 OHCIs. The Enhanced Host Controller

driver controls the ownership during normal functionality.

7.4 Hi-Speed USB analog transceivers

The Hi-Speed USB analog transceivers interface directly to the USB cables via

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).

7.5 LED indicators for downstream ports

Indication of a good USB connection is provided through the GoodLink technology

(open-drain, a maximum current of 20 mA). During enumeration, LED indicators blink

ON momentarily corresponding to the enumeration traffic of the ISP1561 downstream

ports. The LED also blinks ON whenever there is valid traffic to the downstream port.

In the suspend mode, the LED is OFF.

The GoodLink feature provides a user-friendly indication on the status of the USB

traffic between the host and downstream hubs and devices. It is a useful diagnostics

tool to isolate faulty equipment and helps to reduce field support and hotline costs.

The system designer can also 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 as per the USB specification.

9397 750 10015

Product data

Rev. 01 — 06 February 2003

© Koninklijke Philips Electronics N.V. 2003. All rights reserved.

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