LAN9500I-ABZJ Standard Microsystems (SMSC), LAN9500I-ABZJ Datasheet - Page 44

• Manufacturer Part Number: LAN9500I-ABZJ
• Manufacturer: Standard Microsystems (SMSC)

Specifications of LAN9500I-ABZJ

• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Operating Temperature (max): 85C
• Rad Hardened: No
• Lead Free Status / RoHS Status: Compliant

Revision 1.0 (05-17-10)
Chapter 7 NetDetach Operation
NetDetach operation is supported only by LAN9500A/LAN9500Ai
NetDetach is a mode of operation where the device detaches from the USB bus after the Ethernet
cable is disconnected. This is advantageous for mobile devices, as an attached USB device may
prevent the Host CPU from entering the APCI C3 state. Allowing the CPU to enter the C3 state
maximizes battery life, as the C3 state is the lowest of the four APCI power states.
When detached, the device is in a low power state. After the Ethernet cable is reconnected, or a
programmed GPIO pin asserts, the device automatically attaches to the USB bus. GPIO pin assertion
is supported so that this feature can be used with external PHY mode. In this case, the external PHY’s
link LED would be connected to a GPIO.
LAN9500A/
LAN9500Ai
...ZZZ
SMSC
Ethernet
Figure 7.1 Device Detach
DATASHEET
1
2
3
44
Battery-powered Netbook PC
may enter C3 sleep mode
Remove Ethernet Cable
USB Electricals Detach
USB 2.0 to 10/100 Ethernet Controller
.
SMSC LAN950x Family
Datasheet