Analog Devices 82-000845-01 manual LAN Power Jumper JP2, Link Jumper JP3

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.

Table 2-2. JP2 Settings

Functionality	JP2 Setting
No power to the LAN91C111	No jumper
All other cases	JP2.1 and JP2.2 (default)

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 2-3. JP3 Settings

Functionality	JP3 Setting
Logic low on 91C111 link status pin	JP3.1 and JP3.2
All other cases	No jumper (default)

Blackfin USB-LAN EZ-Extender Manual 2-5