CS8420 datasheet(59/80 Pages) CIRRUS

59 / 80 page

CS8420

DS245PP2

AES3/SPDIF Transmitter Interface:

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.

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.

AES3/SPDIF Receiver Interface:

RXP, RXN - Differential Line Receiver Inputs

Differential line receiver inputs, carrying AES3 type data.

RMCK - Input Section Recovered Master Clock Output

Input section recovered master clock output. Will be at a frequency of 256x the input sample rate (Fsi).

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

RERR - Receiver Error Indicator Output

When high, indicates a problem with the operation of the AES3 receiver. The status of this pin is

updated once per sub-frame of incoming AES3 data. Conditions that cause RERR to go high are: parity

error, and bi-phase coding error, as well as loss of lock in the PLL. This is also a start-up option pin,

and requires a pull-up or pull-down resistor.

EMPH/U - Pre-emphasis Indicator Output or U-bit Data Input

The EMPH/U pin either reflects the state of the EMPH channel status bits in the incoming AES3 type

data stream, or is the serial U-bit input for the AES3 type transmitted data, clocked by OLRCK. If

indicating emphasis EMPH/U is low when the incoming data indicates 50/15

µs pre-emphasis and high

otherwise.

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

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.

CS8420 Datasheet(PDF) 59 Page - Cirrus Logic

CS8420 Datasheet(HTML) 59 Page - Cirrus Logic

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