USB2513 SMSC Corporation, USB2513 Datasheet - Page 36

• Manufacturer Part Number: USB2513
• Description: USB 2.0 High-Speed 3-Port Hub Controller
• Manufacturer: SMSC Corporation

Revision 1.98 (11-19-07)
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 Green 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
Figure
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:
4.3) shows a recommended passive scheme. When a pin is configured with a “Strap High”
Table 4.2
Table 3.1
Table 4.2
for the internal default values that are loaded when this option is selected.
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
36
for specific details on how to enable default
USB 2.0 High-Speed 3-Port Hub Controller
SMSC USB2513
Section 4.3.1,
Datasheet