CS8420 datasheet(52/80 Pages) CIRRUS

52 / 80 page

CS8420

DS245PP2

COPY - Copy Channel Status Bit Output

The COPY pin reflects the state of the COPY Channel Status bit in the incoming AES3 type data

stream. This is also a start-up option pin, and requires a pull-up or pull-down resistor.

ORIG - Original Channel Status Output

SCMS generation indicator. This is decoded from the incoming category code and the L bit. A low

output indicates that the audio data stream is 1st generation or higher. A high indicates that the audio

data stream is original.

PRO/C - Professional Channel Status Bit Output or C-bit Data Input

The PRO/C pin either reflects the state of the Professional/Consumer Channel Status bit in the incoming

AES3 type data stream, or is the serial C-bit input for the AES3 type transmitted data, clocked by

OLRCK.

AUDIO/V - Audio Channel Status Bit Output or V-bit Data Input

The AUDIO/V pin either reflects the state of the audio/non audio Channel Status bit in the incoming

AES3 type data stream, or is the V-bit data input for the AES3 type transmitted data stream, clocked by

OLRCK.

Audio Output Interface:

SDOUT - Serial Audio Output Port Data Output

Audio data serial output pin. This is also a start-up option pin, and requires a pull-up or pull-down

resistor.

OSCLK - Serial Audio Output Port Bit Clock Input or Output

Serial bit clock for audio data on the SDOUT pin.

OLRCK - Serial Audio Output Port Left/Right Clock Input or Output

Word rate clock for the audio data on the SDOUT pin. The frequency will be at the output sample rate

(Fso)

AES3/SPDIF Transmitter Interface:

TCBL - Transmit Channel Status Block Start

When operated as output, TCBL is high during the first sub-frame of a transmitted channel status block,

and low at all other times. When operated as input, driving TCBL high for at least three OMCK clocks

will cause the current transmitted sub-frame to be the start of a channel status block.

TCBLD - Transmit Channel Status Block Direction Input

Connect TCBLD to VD+ to set TCBL as an output. Connect TCBLD to DGND to set TCBL as an input.

TXN, TXP - Differential Line Driver Outputs

Differential line driver outputs, transmitting AES3 type data. Drivers are pulled to low while the CS8420

is in the reset state.

CS8420 Datasheet(PDF) 52 Page - Cirrus Logic