Cs8416 – Cirrus Logic CS8416 User Manual

Page 13

DS578F3

CS8416

RXN

Negative AES3/SPDIF Input (Input) - Single-ended or differential receiver input carrying AES3 or
S/PDIF encoded digital data. Used along with RXP[7:0] to form an AES3 differential input. In single-
ended operation this should be AC coupled to ground through a capacitor. See

“External

AES3/SPDIF/IEC60958 Receiver Components” on page 49

for recommended input circuits.

OMCK

System Clock (Input) - When the OMCK System Clock Mode is enabled using the SWCLK bit in the
Control 1 register, the clock signal input on this pin is automatically output through RMCK on PLL unlock.
OMCK serves as the reference signal for OMCK/RMCK ratio expressed in register 18h.

“OMCK System

Clock Mode” section on page 28

RMCK

Input Section Recovered Master Clock (Output) - Input section recovered master clock output from
the PLL. Frequency defaults to 256x the sample rate (F

) and may be set to 128x through the RMCKF bit

in the Control 1 register (01h). RMCK may also be set to high impedance by the RXD bit in the Control 4
register (04h).

OSCLK

Serial Audio Output Bit Clock (Input/Output) - Serial bit clock for audio data on the SDOUT pin

OLRCK

Serial Audio Output Left/Right Clock (Input/Output) - Word rate clock for the audio data on the
SDOUT pin. Frequency will be the output sample rate (Fs)

SDOUT

Serial Audio Output Data (Output) - Audio data serial output pin. This pin must be pulled high to VL
through a 47 k

Ω resistor to place the part in Software Mode.

SDA /

CDOUT

Serial Control Data I/O (I²C) / Data Out (SPI) (Input/Output) - In I²C Mode, SDA is the control I/O data
line. SDA is open drain and requires an external pull-up resistor to VL. In SPI Mode, CDOUT is the out-
put data from the control port interface on the CS8416. See the

“Control Port Description” section on

page 33

SCL /

CCLK

Control Port Clock (Input) - Serial control interface clock and is used to clock control data bits into and
out of the CS8416. CCLK is an open drain output and requires an external pull-up resistor to VL. See the

“Control Port Description” section on page 33

AD0 / CS

Address Bit 0 (I²C) / Control Port Chip Select (SPI) (Input) - A falling edge on this pin puts the CS8416
into SPI Control Port Mode. With no falling edge, the CS8416 defaults to I²C Mode. In I²C Mode, AD0 is
a chip address pin. In SPI Mode, CS is used to enable the control port interface on the CS8416. See the

“Control Port Description” section on page 33

AD1 /
CDIN

Address Bit 1 (I²C) / Serial Control Data in (SPI) (Input) - In I²C Mode, AD1 is a chip address pin. In
SPI Mode, CDIN is the input data line for the control port interface. See the

“Control Port Description”

section on page 33

AD2 /

GPO2

General Purpose Output 2 (Output) - If using the I²C control port, this pin must be pulled high or low
through a 47 k

Ω resistor. See the

“Control Port Description” section on page 33

and

“General Purpose

Outputs” on page 29

for GPO functions.

GPO1