Cirrus Logic CK4970x4 - Manual (Page 45)

5-2 Copyright 2012 Cirrus Logic, Inc. DS898CK7
Running the CK49x Board in Standalone Mode
CK49x User’s Manual
5.2 System Boot-up
If the USB cable is connected to the CK49x Evaluation System, the system will boot up in USB mode
upon power up or system reset. The LCD displays “Wait for USB enumeration…” message first and then
shows the board name,” CK49x”, “USB” which signifies that a USB connection is active, and the MCU
firmware revision number that is currently active.
If the USB cable is not connected to the CK49x Evaluation System, the system will boot in Standalone
mode on power up or system reset. The LCD displays “Booting 49x” and firmware revision number if DSP
startup failed. Otherwise, the LCD displays “Booted 49x Successfully!” message and then goes to the
Status Display mode.
If the MCU application does not recognize the installed daughter card, the user should check the
connection between the DS4953x daughter card and the CDB49x main board, and, if necessary,
reconnect the two boards. This action should correct any connectivity problems between the two boards.
5.3 Top-Level Description of the CK49x Evaluation System
Buttons and Rotary Knob Functions
In Standalone mode, the functionality of the on-board buttons and Rotary Knob are defined as follows.
MENU Button
By pressing the MENU button, the system enters Set-up mode, which allows the user to
manually turn the S5 Button/Rotary Knob to cycle through the Level 1 menu options show in
Table 5-1 . In this mode, the user can configure the audio source, surround sound mode,
virtualization mode, and bass management mode. Pressing this button again exits the Set-up
mode.
LEFT Button
In the Set-up mode, pressing this button causes the menu selection that is visible on the LCD
screen to move one menu level up in the menu hierarchy.
RIGHT Button
In the Set-up mode, pressing this button causes the menu selection that is visible on the LCD
screen to move one menu level down in the menu hierarchy, making a submenu option
visible with a blinking cursor next to it. By pressing the Right Button again, the user can
activate this submenu option. Once the option is chosen, an asterisk (*) will appear next to
the option indicating that the option is now the new default.
EXIT Button
In Set-up mode or Volume Adjustment mode, pressing this button exits to Status Display
mode.
Figure 5-1 shows the location of the CK49x Evaluation System push buttons