User`s guide

Blackfin USB-LAN EZ-Extender Manual 2-7
USB-LAN EZ-Extender Hardware Reference
Ethernet processor. The address enable switch adds flexibility to the pro-
cessors because you can turn the switch
OFF when capacitive loading is an
issue present with other peripherals on the EZ-KIT Lite.
FLAGS Enable Switch (SW1.2)
The flags enable switch, SW1.2, is used to control the output of the Black-
fin Flags multiplexer. By default, the SW1.2 switch is set to the ON position.
If is in the OFF position, the user cannot communicate to the USB or
Ethernet processor. The flags enable switch adds flexibility to the
extender—when the switch is OFF, the flags can be used for other periph-
erals of the EZ-KIT Lite.
USB IRQ Enable Switch (SW1.3)
The USB IRQ enable switch, SW1.3, is used to control the connection
between the Netchip 2272 IRQ line with the respective flag pin on the
Blackfin processor. The switch connects the USB_IRQ line with PF10 on
the ADSP-BF533 and ADSP-BF561 processors, and PF7 on the
ADSP-BF537 processor. By default, the USB IRQ enable switch is in the
ON position. When in the OFF position, communication with the USB
Table 2-4. SW1.1 Settings
Functionality SW1.1 Setting
Blackfin address buffer (U1) enabled ON (default)
Blackfin address buffer (U1) disabled OFF
Table 2-5. SW1.2 Settings
Functionality SW1.2 Setting
FLAGS (U12) enabled ON (default)
Blackfin FLAGS (
U12) disabled OFF