Datasheet
USB 2.0 Hub and 10/100 Ethernet Controller
Datasheet
SMSC LAN9512/LAN9512i 25 Revision 1.2 (02-29-12)
DATASHEET
29h Non-Removable Devices Register (NRD)
Indicates which port(s) include non-removable devices.
0 = Port is removable
1 = Port is non-removable
Informs the host if one of the active ports has a permanent device that is not
detachable from the Hub.
Note: The device must provide its own descriptor data.
Bit 7 = RESERVED
Bit 6 = RESERVED
Bit 5 = RESERVED
Bit 4 = RESERVED
Bit 3 = 1; Port 3 non-removable
Bit 2 = 1; Port 2 non-removable
Bit 1 = 1; Port 1 non-removable
Bit 0 is RESERVED, always = 0b
Note: Bit 1 must be set to 1 by firmware for proper identification of the Ethernet
Controller as a non-removable device.
02h
2Ah Port Disable (Self) Register (PDS)
Disables 1 or more ports.
0 = Port is available
1 = Port is disabled
During Self-Powered operation, this selects the ports which will be permanently
disabled, and are not available to be enabled or enumerated by a host controller. The
ports can be disabled in any order, the internal logic will automatically report the
correct number of enabled ports to the USB host, and will reorder the active ports in
order to ensure proper function.
Bit 7 = RESERVED
Bit 6 = RESERVED
Bit 5 = RESERVED
Bit 4 = RESERVED
Bit 3 = 1; Port 3 disabled
Bit 2 = 1; Port 2 disabled
Bit 1 = 1; Port 1 disabled
Bit 0 is RESERVED, always = 0b
30h
2Bh Port Disable (Bus) Register (PDB)
Disables 1 or more ports.
0 = Port is available
1 = Port is disabled
During Bus-Powered operation, this selects the ports which will be permanently
disabled, and are not available to be enabled or enumerated by a host controller. The
ports can be disabled in any order, the internal logic will automatically report the
correct number of enabled ports to the USB host, and will reorder the active ports in
order to ensure proper function.
Bit 7 = RESERVED
Bit 6 = RESERVED
Bit 5 = RESERVED
Bit 4 = RESERVED
Bit 3 = 1; Port 3 disabled
Bit 2 = 1; Port 2 disabled
Bit 1 = 1; Port 1 disabled
Bit 0 is RESERVED, always = 0b
30h
Table 3.3 Hub Configuration (continued)
EEPROM
OFFSET DESCRIPTION DEFAULT