User's Manual

Switch Settings
2-8 Blackfin USB-LAN EZ-Extender Manual
When
SW1.3 is OFF, communication with the USB processor cannot be
established. The SW1.3 adds flexibility to the extender—when the switch is
OFF, the flag can be used for other peripherals of the EZ-KIT Lite.
Test Mode Enable Switch (SW1.4)
The test mode enable switch, SW1.4, is an internal test pin and should not
be used (see Table 2-7). By default SW1.4 is OFF.
Serial ROM Enable Switch (SW2.1)
The serial ROM enable switch, SW2.1, is used to control the connection
between the LAN91C111 Ethernet processor and its serial ROM (U3) (see
Table 2-8). When the switch is disabled, the Ethernet processor loads its
Media Access Control (MAC) address from the serial ROM. By default
SW2.1 is OFF. When the switch is ON, you cannot communicate with the
provided Ethernet application code. The switch adds flexibility to the
extender—you can modify the application code and generate another
MAC address when SW2.1 is ON.
Table 2-6. SW1.3 Settings
Functionality SW1.3 Setting
USB IRQ enabled ON (default)
USB IRQ disabled OFF
Table 2-7. SW1.4 Settings
Functionality SW1.4 Setting
Test mode enabled ON
Test mode disabled OFF (default)