lan9512 Standard Microsystems Corp., lan9512 Datasheet - Page 27

• Manufacturer Part Number: lan9512
• Description: Usb Hub With Integrated 10/100 Ethernet Controller
• Manufacturer: Standard Microsystems Corp.

USB Hub with Integrated 10/100 Ethernet Controller
Datasheet
SMSC LAN9512
EEPROM
OFFSET
37h
38h
39h
Note 3.1
Port Remap 3 Register (PRTR3)
When a hub is enumerated by a USB Host Controller, the hub is only permitted to
report how many ports it has. The hub is not permitted to select a numerical range or
assignment. The Host Controller will number the downstream ports of the hub starting
with the number 1, up to the number of ports that the hub reported having.
The host’s port number is referred to as “Logical Port Number” and the physical port
on the hub is the “Physical Port Number”. When remapping mode is enabled (see
Port Re-Mapping Enable (PRTMAP_EN)
Format), the hub’s downstream port numbers can be remapped to different logical port
numbers (assigned by the host).
Note:
RESERVED
Status/Command Register (STCD)
Refer to
details.
Bit [7:4] =
Bit [3:0] =
Table 3.9, “Status/Command Register (STCD) Format,” on page 31
The OEM must ensure that Contiguous Logical Port Numbers are used,
starting from #1 up to the maximum number of enabled ports, this ensures
that the hub’s ports are numbered in accordance with the way a Host will
communicate with the ports.
Default value is dependent on device revision.
0001
0010
0000
0011
-
Table 3.3 Hub Configuration (continued)
RESERVED
Physical Port 3 is Disabled
Physical Port 3 is mapped to Logical Port 1
Physical Port 3 is mapped to Logical Port 2
Physical Port 3 is mapped to Logical Port 3
All others RESERVED
DATASHEET
DESCRIPTION
bit in
27
Config Data Byte 3 Register (CFG3)
for
Revision 1.0 (04-20-09)
DEFAULT
03h
00h
01h