ISP1521BE ST-Ericsson Inc, ISP1521BE Datasheet - Page 18

• Manufacturer Part Number: ISP1521BE
• Description: IC USB HUB CONTROLLER HS 80-LQFP
• Manufacturer: ST-Ericsson Inc

Specifications of ISP1521BE

• Controller Type: USB Hub
• Interface: I²C
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 80-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Other names: 568-1170; ISP1521BE,557

Philips Semiconductors
ISP1521_4
Product data sheet
8.2.2 Architecture of configurable hub descriptors
The configurable hub descriptors can be masked in the internal ROM memory; see
Figure
microcontroller. The ISP1521 implements both the master and slave I
The information from the external EEPROM or the microcontroller is transferred into the
internal RAM during the power-on reset. A signature word is used to identify correct
descriptors. If the signature matches, the content of the RAM is chosen instead of the
ROM.
When external microcontroller mode is selected and while the external microcontroller is
writing to the internal RAM, any request to configurable descriptors will be responded to
with a Not AcKnowledge (NAK). There is no specified time-out period for the NAK signal.
This data is then passed to the host during the enumeration process.
The three configuration methods are selected by connecting pins SCL and SDA in the
manner given in
Table 11.
Configuration method
Internal ROM
External EEPROM
External microcontroller
Fig 7. Configurable hub descriptors
7. These descriptors can also be supplied from an external EEPROM or a
The I
Configuration method
2
C-bus cannot be shared between the EEPROM and the external microcontroller.
HUB CORE
Table
11.
Rev. 04 — 30 March 2006
SCL
ground
2.2 k -to-4.7 k pull-up
driven LOW by the
microcontroller during reset
DESCRIPTOR
GENERATOR
INTERFACE
MICROCONTROLLER
MUX
signature
match
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Hi-Speed USB hub controller
SDA
ground
2.2 k -to-4.7 k pull-up
2.2 k -to-4.7 k pull-up
I
2
SERIAL EEPROM
C-BUS INTERFACE
MASTER/SLAVE
(256 B)
(256 B)
ROM
RAM
2
C-bus controllers.
I
2
ISP1521
C-bus
mld711
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