User`s guide

Blackfin USB-LAN EZ-Extender Manual 2-5
USB-LAN EZ-Extender Hardware Reference
LAN Power Jumper (JP2)
The LAN power jumper, JP2, is used to power the SMSC’s 91C111 device
with 3.3V. By default, and, in general, the jumper is plugged in. This
jumper is provided for user flexibility. The user must make changes to the
JP2 jumper only when no power is applied to the USB-LAN EZ-Extender
and/or the EZ-KIT Lite.
Link Jumper (JP3)
The link jumper, JP3, of the USB-LAN EZ-Extender directly connects to
the link status pin of the SMSC’s 91C111 device. The default setting is to
keep the link jumper unpopulated. When the jumper is populated, it
sends a logic 0 or LOW to the input port used to convey the LINK status
(EPHSR bit14). For more information about populating the jumper, refer
to the SMSC LAN91C111 data sheet.
Table 2-2. JP2 Settings
Functionality JP2 Setting
No power to the LAN91C111 No jumper
All other cases JP2.1 and JP2.2 (default)
Table 2-3. JP3 Settings
Functionality JP3 Setting
Logic low on 91C111 link status pin JP3.1 and JP3.2
All other cases No jumper (default)