CS8416-CS datasheet(16/48 Pages) CIRRUS

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CS8416

DS578PP2

5 S/PDIF RECEIVER

The CS8416 includes an AES3/SPDIF digital au-

dio receiver. The AES3 receiver accepts and de-

codes audio and digital data according to the AES3,

IEC60958 (S/PDIF), and EIAJ CP-1201 interface

standards. The receiver consists of an analog differ-

ential input stage, driven through analog input pins

RXP0 to RXP7 and a common RXN, a PLL based

clock recovery circuit, and a decoder which sepa-

rates the audio data from the channel status and

user data.

Software Mode

The first 5 bytes of both channels status block is

stored in dedicated registers. Channel A status data

is stored in control port registers 19h to 1Dh. Chan-

nel B status data is stored in control port registers

1Eh to 22h.

Q Subcode data is stored in control port registers

0Eh to 17h.

PC Burst preamble is stored in control port regis-

ters 23h and 24h. PD Burst preamble is stored in

control port registers 25h and 26h.

U and C data may be selected for output on GPO

pins.

External components are used to terminate and iso-

late the incoming data cables from the CS8416.

These components are detailed in Appendix A.

Hardware Mode

U and C bits are output on pins 18 and 19 respec-

tively. See Section “Hardware Mode Function Se-

lection” on page 40 and “Hardware Mode Settings

(Defaults & Controls)” on page 40 to configure

these pins.

5.1

8:2 S/PDIF Input Multiplexer

The CS8416 employs a 8:2 S/PDIF input multi-

plexer to accommodate up to eight channels of in-

put digital audio data. Digital audio data may be

single- ended or differential. Differential inputs uti-

lize RXP[0-7] and a shared RXN. Single ended sig-

nals are accommodated by using RXP inputs and

AC coupling RXN to ground.

All inputs to the CS8416 8:2 input multiplexer

should be coupled through a capacitor. The recom-

mended capacitor value is 0.01uF to 0.1uF. The

recommended dielectrics are COG or X7R.

Software Mode

The multiplexer select line control is accessed

through bits RXSEL[2:0] in control port register 4.

The multiplexer defaults to RXP0.

The second output of the input multiplexer is used

to provide the selected input as a source to be out-

put on a GPO pin via the internal TX pin. This pass

through signal is selected by TXSEL[2:0] in con-

trol port register 04h. The single-ended signal is re-

solved to full-rail, but is not de-jittered before it is

output.

Hardware Mode

In hardware mode the input to the decoder is select-

ed by dedicated pins, RXSEL[1:0].

The pass through signal is selected by dedicated

pins, TXSEL[1:0] for output on the dedicated TX

pin.

Selectable inputs are restricted to RXP0 to RXP3

for both the receiver and the TX output pin. These

inputs are selected by RXSEL[1:0] and TX-

SEL[1:0] respectively.

General

Unused multiplexer inputs should be left floating

or grounded.

The input voltage range for the input multiplexer is

set by the I/O power supply pin, VL+. The input

voltage of the RXP and RXN pins is also set by the

level of VL+.

5.2

PLL, Jitter Attenuation, and Clock

Switching

An on-chip Phase Locked Loop (PLL) is used to re-

cover the clock from the incoming data stream.

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