ISP1561BMUM ST-Ericsson Inc, ISP1561BMUM Datasheet - Page 12

• Manufacturer Part Number: ISP1561BMUM
• Description: IC USB HOST CTRL HI-SPD 128LQFP
• Manufacturer: ST-Ericsson Inc

Specifications of ISP1561BMUM

• Controller Type: USB Peripheral Controller
• Interface: PCI
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 128-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Other names: ISP1561BM-T; ISP1561BM-T

NXP Semiconductors
7. Functional description
ISP1561_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
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, 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
provides four downstream ports that 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 OHCIs. 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).
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 ISP1561 downstream ports. The
LED also blinks on whenever there is valid traffic to the downstream port. In 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.
All LED indicators are open-drain output.
Ref. 2 “Enhanced Host Controller Interface Specification for Universal Serial Bus”
Rev. 02 — 5 March 2007
HS USB PCI Host Controller
© NXP B.V. 2007. All rights reserved.
ISP1561
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