Cirrus Logic CRD48L10 - Manual (Page 15)

1
3.1 S1 Button Control (No LCD)
Chapter 3
Standalone Modes
The CRD48L10-4in4out has multiple audio input and output ports. All available data flow paths are shown in the diagram
in
Fig. 3-1 .
Figure 3-1. Data Flow Paths
The data path can be selected using either the mode select button S1 on the CRD48L10-4in4out or with the
MCU-USER-INTERFACE board. The data path options available using only S1 are a subset of those available with the
MCU-USER-INTERFACE board. The two modes will be described in separate sections below.
It is worth noting that the VSP port of the CS42L73 is always available for external audio through TP14, but not with the
default MCU code provided with the CRD48L10-4in4out. An external MCU must configure the CS42L73 to utilize audio
data from the VSP.
3.1 S1 Button Control (No LCD)
3.1.1 Powering Up Board
When powering on the CRD48L10 board, the power LEDs D5–D9 should illuminate indicating that all power rails are good
and the output connector LEDs D4, D8, D10, D11, and D20 should illuminate to show that the MCU has configured the
codec to drive audio out of the board. No input mode LEDs are illuminated since default input mode is from on-board
FLASH. Power up state of the CRD48L10 is shown in
Fig. 3-2 .
Digital MIC
MIC1
MIC2
Line In (L)
Line In (R)
ASP OUT
XSP OUT
DAI1
DAI2
Level
Translation
DAO1
DAO 2
Level
Translation
SPDIF TX
(CS8406)
ASP IN
XSP IN
Speakerphone (L)
Speakerphone (R)
AMP
(CS3501 )
EAR
Headphone Outputs (L&R)
Line Outputs (L&R)
(CS42L73)
Mini Optical RX Mini Optical TX
VSP OUT VSP IN
Level Translation
GSM Telit HDR
MCU
(C8051 F930)
1MB SPI FLASH
(SST25WF080)
1MB SPI FLASH
(SST25WF080)
JP2 HDR I 2C
SPI
SCP
6 resistor ladder
buttons
5 green LEDs
1 SPDIF ON LED
(CS48L10)
(For DSP Master Boot )
(For DSP Slave Boot )
Level
Translation
I2C to 8-bit
I/O Expander
(PCF8574 )
8 blue LEDs for audio
I /O active indications
TP11(JP3 HDR)
ADC
DAC
DAC
SPDIF RX
(CS8416 )