USB2514I SMSC Corporation, USB2514I Datasheet - Page 37

• Manufacturer Part Number: USB2514I
• Description: Industrial Temperature Rated USB 2.0 High-Speed 4-Port Hub Controller
• Manufacturer: SMSC Corporation

Industrial Temperature Rated USB 2.0 High-Speed 4-Port Hub Controller
Datasheet
SMSC USB2514i
4.4.7
4.4.8
4.4.8.1
4.4.8.2
4.5
4.6
Bus Reset Sequence
The SMBus Slave Interface resets and returns to the idle state upon a START field followed
immediately by a STOP field.
SMBus Alert Response Address
The SMBALERT# signal is not supported by the Hub.
Undefined Registers
The registers shown in
return 00h. Writes to undefined registers have no effect and do not return an error.
Reserved Registers
Unless otherwise instructed, only a ‘0’ may be written to all reserved registers or bits.
The SMSC Hub can be configured via its internal default configuration. (please see
"Internal Register Set (Common to EEPROM and SMBus)"
configuration.)
Please refer to
The USB2514 can be configured via a combination of internal default values and pin strap options.
Please see
configuration option.
The strapping option pins only cover a limited sub-set of the configuration options. The internal default
values will be used for the bits & registers that are not controlled by a strapping option pin. Please
refer to
The Amber andGreen LED pins are sampled after RESET_N negation, and the logic values are used
to configure the hub if the internal default configuration mode is selected. The implementation shown
below (see
High” configuration, the LED functions with active low signalling, and the PAD will “sink” the current
from the external supply. When a pin is configured with a “Strap Low” configuration, the LED functions
with active high signalling, and the PAD will “source” the current to the external LED.
Default Configuration Option:
Default Strapping Options:
Table 4.2
Figure
Table 3.1
Table 4.2
for the internal default values that are loaded when this option is selected.
4.3) shows a recommended passive scheme. When a pin is configured with a “Strap
and
Table 4.2
for the internal default values that are loaded when this option is selected.
Table 3.2
are the defined registers in the Hub. Reads to undefined registers
DATASHEET
for specific details on how to enable the default/pin-strap
37
for specific details on how to enable default
Revision 1.98 (11-19-07)
Section 4.3.1,