User's Manual

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 (see Table 2-2). By default and in general, the jumper is
plugged in for extra flexibility. You must make changes to JP2 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, connects directly to the link status pin of the
SMSC’s 91C111 device (see Table 2-3). The default setting is to keep JP3
unpopulated. When JP3 is populated, it sends a logic 0 or LOW to the input
port used to convey the LINK status (EPHSR bit 14). For more information
about populating the link 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)