CS4225 Datasheet, PDF (18/30 Pages) Cirrus Logic – Digital Audio Conversion System

CS4225
Clock Mode Byte (9)
Status Report Byte (11)
B7 B6 B5 B4 B3 B2 B1 B0
0 CO1 CO0 CI1 CI0 CS2 CS1 CS0
CS1 - CS0
Cl1 - CI0
CO1-CO0
Sets the source of the master clock
which runs the CS4225.
0 - Crystal Oscillator or XTI (PLL Disabled)
1 - PLL driven by LRCKAUX at 1 Fs
2 - PLL driven by LRCK at 1 Fs
3 - PLL driven by XTI/XTO (XTI at 1 Fs)
4 - PLL driven by SCLK at 32 Fs
5 - PLL driven by SCLK at 64 Fs
6 - PLL driven by SCLKAUX at 32 Fs
7 - PLL driven by SCLKAUX at 64 Fs
Determines frequency of XTI
when PLL is disabled.
0 - 256 Fs
1 - 384 Fs
2 - 512 Fs
3 - Reserved
Determines CLKOUT frequency
0 - 256 Fs
1 - 384 Fs
2 - 512 Fs
3 - 1 Fs
Control Byte (10)
B7 B6 B5 B4 B3 B2 B1 B0
MUTC CAL DEMC DEM MUT4 MUT3 MUT2 MUT1
MUT4 to
MUT1
DEM
DEMC
CAL
MUTC
Mute Control Bits
0 - Normal Output Level
1 - Selected DAC output muted
Selects De-Emphasis
0 - Normal Flat DAC frequency response
1 - CD De-Emphasis Selected
Selects De-Emphasis Control Source
0 - De-emphasis is controlled by DEM
pin. DEM bit is ignored.
1 - De-emphasis is controlled by DEM bit.
DEM pin is ignored.
0 - Normal Operation
1 - Initiate Calibration
Controls mute on consecutive zeros
function
0 - 512 consecutive zeros will mute DAC
1 - DAC output will not mute on zeros.
B7 B6 B5 B4 B3 B2 B1 B0
OVL1 OVL0 OV12 ACK 0 LOCK CALD 0
OVL1 to
OVL0
OV12
ACK
LOCK
CALD
16 - bit ADC overload bits.
00 - Normal ADC input levels
01 - -6 dB level
10 - -3 dB level
11 - Clipping
Indicates one of the ADC’s has been
overdriven. These bits are "sticky".
They will stay set until read, when they
will return to 00 if the overload is no
longer present.
12-bit ADC overload bit
0 - normal input
1 - clipped input
This bit is also "sticky"
Control port data check bit
0 - Multiple of 8 clocks received
last word (SPI Mode)
1 - Error, not multiple of 8 clocks received.
PLL lock indicator
0 - PLL not locked. If PLL is selected,
DAC outputs will mute
1 - PLL locked
0 - Calibration done
1 - Calibration in progress
Input Selection Byte (12)
B7 B6 B5 B4 B3 B2 B1 B0
0 0 0 0 0 0 IS1 IS0
IS1 - IS0
Select input channel
0 - Select AIN1
1 - Select AIN2
2 - Select AIN3
3 - Select Auxiliary Digital Input Port
Aux Control Byte (13)
B7
AIM
AIM
B6 B5 B4 B3 B2 B1 B0
0000000
Auxiliary Input Mode Control Bit
0 - AINAUX signal is routed to 12-bit ADC
1 - AINAUX routed to AINL of 16-bit ADC
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DS86PP8