CS4226 Datasheet, PDF (32/60 Pages) Cirrus Logic – Surround Sound Codec

CS4226
SCLKAUX/RX2 - Auxiliary Bit Clock Input or Output / Receiver Channel 2, PIN 43.
In auxiliary slave mode, SCLKAUX is the serial data bit clock from an external digital audio
source, used to clock in data on DATAAUX. In auxiliary master mode, SCLKAUX is a serial data
bit clock output. As RX2, this pin is configured as S/PDIF input channel 2 via the control port.
HOLD/RUBIT - S/PDIF Received User Bit / HOLD Control, PIN 2.
When the S/PDIF receiver is chosen as the clock source (CS = 4, 5, 6 and HPC = 1), then this
pin outputs the received user bit. When HPC = 0, this pin is sampled on the active edge of
SCLKAUX. If it is high any time during the frame, DATAUX data is ignored and the previous
“good” sample is output to the serial output port.
Control Port Signals
I²C/SPI - Control Port Format, PIN 7.
Setting this pin high configures the control port for the I²C interface; a low state configures the
control port for the SPI interface . The state of this pin sets the function of the control port
input/output pins .
SCL/CCLK - Serial Control Interface Clock, PIN 3.
SCL/CCLK is the serial control interface clock, and is used to clock control bits into and out of
the CS4226.
AD0/CS - Address Bit / Control Port Chip Select, PIN 6.
In I²C mode, AD0 is a chip address bit. In SPI software control mode, CS is used to enable the
control port interface on the CS4226.
AD1/CDIN - Address Bit / Serial Control Data In, PIN 5.
In I²C mode, AD1 is a chip address bit. In SPI software control mode, CDIN is the input data
line for the control port interface.
SDA/CDOUT - Serial Control Data Out, PIN 4.
In I²C mode, SDA is the control data I/O line. In SPI software control mode, CDOUT is the
output data from the control port interface on the CS4226.
Clock and Crystal Pins
XTI, XTO - Crystal connections, PIN 28, 29.
Input and output connections for the crystal which may be used to operate the CS4226.
Alternatively, a clock may be input into XTI.
CLKOUT - Master Clock Output, PIN 31.
CLKOUT allows external circuits to be synchronized to the CS4226. Alternate output
frequencies are selectable by the control port.
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