Programmable Flag Push Buttons (Sw8-11); Reset Push Button (Sw12); External Port Enable Switch (Sw13) - Analog Devices ADSP-21479 EZ-Board Manual

Push Buttons and Switches
Programmable Flag Push Buttons (SW8–11)
Four momentary push buttons (
user input. The buttons are connected to the GPIO pins of the processor.
The push buttons are active high and, when pressed, send a high (
processor. Switches
responding signals. Refer to
page 2-11 and
more information.

Reset Push Button (SW12)

The reset push button (
• ADSP-21479 processor (
• AD1939 audio codec (
• Parallel flash memory (
The reset also is linked to the expansion II interface; any daughter card
connected to the expansion interface that requires a reset can use
The reset push button does not reset the standalone debug agent once the
debug agent is connected to a personal computer (PC). After communica-
tion between the debug agent and PC is initialized, pushing a reset button
does not reset the USB chip on the debug agent. The only way to reset the
USB chip on the debug agent is to power down the EZ-Board.

External Port Enable Switch (SW13)

The external port enable switch (
processor from the associated peripherals on the EZ-Board and allows the
respective control signals to be used on the expansion II interface. See
Table 2-10.
2-12
SW8
and
SW7 SW13
"DAI [17–20] Enable Switch (SW7)" on
"External Port Enable Switch (SW13)" on page 2-12
) resets the following ICs:
SW12
U1
U19
)
U4
ADSP-21479 EZ-Board Evaluation System Manual
– ) are provided for general-purpose
11
disconnect the push buttons from the
)
)
) disconnects the control pins of the
SW13
) to the
1
for
.
SW12