User's Manual

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 (see Table 2-5). By default, the SW1.2 switch is set to
ON. When SW1.2 is OFF, you 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 peripherals 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 and respective flag pin on the Black-
fin processor (see Table 2-6). The switch connects the USB_IRQ line
with PF10 on the ADSP-BF533/ADSP-BF561 processors, and PF7 on the
ADSP-BF537 processor. By default, the USB IRQ enable switch is
ON.
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