Cirrus Logic CS42518 - Manual (Page 35)

DS584F2 35
CS42518
4.6.4.4 OLM Config #4
This configuration will support up to 8 channels of DAC data 6 channels of ADC data and no channels of
S/PDIF received data. OLM Config #4 will handle up to 20-bit ADC samples at an Fs of 48 kHz and 24-
bit DAC samples at an Fs of 48 kHz. Since the ADC’s data stream is configured to use the SAI_SDOUT
output and the internal and external ADCs are clocked from the SAI_SP, the sample rate for the CODEC
Serial Port can be different from the sample rate of the Serial Audio Interface serial port.
Register / Bit Settings Description
Functional Mode Register (addr = 03h)
Set CODEC_FMx = 00,01,10 CX_LRCK can run at SSM, DSM, or QSM independent of SAI_LRCK
Set SAI_FMx = 00,01,10 SAI_LRCK can run at SSM, DSM, or QSM independent of CX_LRCK
Set ADC_SP SELx = 10
Configure ADC data to use SAI_SDOUT and SAI_SP Clocks. S/PDIF data
is not supported in this configuration
Interface Format Register (addr = 04h)
Set DIFx bits to proper serial format Select the digital interface format when not in one line mode
Set ADC_OLx bits = 00,01 Select ADC operating mode, see table below for valid combinations
Set DAC_OLx bits = 00,01,10 Select DAC operating mode, see table below for valid combinations
Misc. Control Register (addr = 05h)
Set CODEC_SP M/S = 1 Set DAC Serial Port to master mode.
Set SAI_SP M/S = 0 or 1 Set ADC Serial Port to master mode or slave mode.
Set EXT ADC SCLK = 0 Identify external ADC clock source as SAI Serial Port.
CX_SDOUT= not used
SAI_SDOUT=ADC Data
DAC Mode
Not One Line Mode
One Line Mode #1 One Line Mode #2
ADC Mode
Not One-
Line Mode
CX_SCLK=64 Fs
CX_LRCK=SSM/DSM/QSM
SAI_SCLK=64 Fs
SAI_LRCK=SSM/DSM/QSM CX_SCLK=128 Fs
CX_LRCK=SSM/DSM
SAI_SCLK=64 Fs
SAI_LRCK=SSM/DSM/QSM CX_SCLK=256 Fs
CX_LRCK=SSM
SAI_SCLK=64 Fs
SAI_LRCK=SSM/DSM/QSM
One-Line
Mode #1
CX_SCLK=64 Fs
CX_LRCK=SSM/DSM/QSM
SAI_SCLK=128 Fs
SAI_LRCK=SSM CX_SCLK=128 Fs
CX_LRCK=SSM/DSM
SAI_SCLK=128 Fs
SAI_LRCK=SSM CX_SCLK=256 Fs
CX_LRCK=SSM
SAI_SCLK=128 Fs
SAI_LRCK=SSM
One-Line
Mode #2
not valid not valid not valid
SCLK_PORT1
LRCK_PORT1
SDIN_PORT1
SCLK_PORT2
LRCK_PORT2
SDIN_PORT2
SCLK_PORT3
LRCK_PORT3
SDOUT1_PORT3
SDOUT2_PORT3
SDOUT3_PORT3
SDOUT4_PORT3
RMCK
ADCIN1
ADCIN2
MCLK
SDOUT1
SDOUT2
LRCK
SCLK
64Fs,128Fs,256Fs
ADC Data
64Fs,128Fs
DIGITAL AUDIO
PROCESSOR
CS5361
CS5361
SAI_SCLK
SAI_LRCK
SAI_SDOUT
CX_SCLK
CX_LRCK
CX_SDOUT
CX_SDIN1
CX_SDIN2
CX_SDIN3
CX_SDIN4
MCLK
Figure 19. OLM Configuration #4
CS42516