Datasheet

Push Buttons and Switches
2-12 ADSP-21479 EZ-Board Evaluation System Manual
processor. Switches
SW7 and SW13 disconnect the push buttons from the
responding signals. Refer to “DAI [17–20] Enable Switch (SW7)” on
page 2-11 and “External Port Enable Switch (SW13)” on page 2-12 for
more information.
Reset Push Button (SW12)
The reset push button (SW12) resets the following ICs:
• ADSP-21479 processor (
U1)
• AD1939 audio codec (U19)
• Parallel flash memory (U4)
The reset also is linked to the expansion II interface; any daughter card
connected to the expansion interface that requires a reset can use SW12.
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 (SW13) disconnects the control pins of the
processor from the associated peripherals on the EZ-Board and allows the