Cirrus Logic CDB47xxx, User Manual

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Running the ADC In / DAC Out Example Application
CDB47xxx User’s Manual
DS886DB9 Copyright 2012 Cirrus Logic, Inc 4-6
4.2.3 Input Channel Remap
All designs, regardless of the input sources chosen, must include the Input Remap block which maps the
input sources to the internal channels of the DSP. Drag the Input Remap block to the workspace, right-
click on the Remap Audio Input block, and choose Device Properties. Figure 4-7 shows the channel map/
remap options that are available.
Figure 4-7. Input Remap Device Properties
After selecting the combination of channels to map or remap, the channel wiring options appear in the
Remap Audio Input block. Channels that are not available, now appear as No Connects (NC). By
changing from an option with a smaller number of channels to map, such as “2/0 L/R,” to another option
that maps more channels, such as “3/4 L, C, R, Ls, Rs, Lb, Rb,” all the NO Connects go away and
become available for wiring.
Enter the Wire Mode (Ctrl + w) of DSP Composer to make the following wiring connections:
• From the outputs of the Audio In block to the inputs of the Input Remap block.
• From the output of the Input Remap block to the input of the MPM processing block
• From the output of MPM to the input of VPM
• From the output of VPM to the input of PPM
• From the output of PPM to the input of the Output Remap block
• From the output of the Output Remap block to the input of the Audio Out block
4.2.4 Output Channel Remap
All designs, regardless of the output configuration chosen, must include the Output Remap block which
maps the internal channels of the DSP to the output channels. Drag the Output Remap block to the
workspace.(The Output Remap block has no Device Properties to edit.) Use the Composer Wire mode
(Ctrl + w) and draw wires from the output terminals of the Output Remap block to the desired terminals of
the Audio Output block discussed in the next section, “ Selecting the Audio Output Configuration”
4.2.5 Selecting the Audio Output Configuration
Configure the audio outputs to the DSP by dragging and dropping the Audio Out block onto the
workspace. The dialog box shown in Figure 4-8 appears. Choose from one of the supported output
combinations as described in the subsections, Section 4.2.5.1 to Section 4.2.5.3 . DAC is selected by
default. The input configuration may be changed later by right clicking on the Audio Out block and
selecting Device Properties.
The Device Properties dialog box allows the user to configure one or more of the following:
• DAC
• I
2
S
• S/PDIF Out