Analog Devices 82-000845-01 manual Flags Enable Switch SW1.2, USB IRQ Enable Switch SW1.3

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.

Table 2-4. SW1.1 Settings

Functionality	SW1.1 Setting
Blackfin address buffer (U1) enabled	ON (default)
Blackfin address buffer (U1) disabled	OFF

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.

Table 2-5. SW1.2 Settings

Functionality	SW1.2 Setting
FLAGS (U12) enabled	ON (default)
Blackfin FLAGS (U12) disabled	OFF

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.

Blackfin USB-LAN EZ-Extender Manual 2-7