WM8580 datasheet(53/92 Pages) WOLFSON

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WM8580

PP Rev 1.0 March 2006

S/PDIF TRANSCEIVER

FEATURES

•

IEC-60958-3 compatible with 32k frames/s to 192k frames/s support

•

Support for Reception and Transmission of S/PDIF data

•

Clock synthesis PLL with reference clock input and ultra-low jitter output

•

Input mux with support for up to four S/PDIF inputs

•

Detection of non-audio data, sample rate, and pre-emphasised data

•

Programmable GPO for error flags, frame status flags and clocks

An IEC-60958-3 compatible S/PDIF transceiver is integrated into the WM8580. Operation of the

S/PDIF function may be synchronous or asynchronous to the rest of the digital audio circuits.

The receiver performs data and clock recovery, and sends recovered data either to an external

device such as a DSP (via the Digital Audio Interfaces), or if the data is audio PCM, it can route the

stereo recovered data to DAC1. The recovered clock may be routed out of the WM8580 onto a pin

for external use, and may be used to clock the internal DAC as required.

The transmitter generates S/PDIF frames where audio data may be sourced from the ADC, S/PDIF

Receiver, or the Digital Audio Interfaces.

S/PDIF FORMAT

S/PDIF is a serial, bi-phase-mark encoded data stream. An S/PDIF frame consists of two sub-

frames. Each sub-frame is made up of:

•

Preamble – a synchronization pattern used to identify the start of a 192-frame block or sub-

frame

•

4-bit Auxiliary Data (AUX) – ordered LSB to MSB

•

20-bit Audio Data (24-bit when combined with AUX) – ordered LSB to MSB

•

Validity Bit – a 1 indicates invalid data in that sub-frame

•

User Bit – over 192-frames, this forms a User Data Block,

•

Channel Bit – over 192-frames, this forms a Channel Status Block

•

Parity Bit – used to maintain even parity over the sub-frame (except the preamble)

An S/PDIF Block consists of 192 frames. Channel and User blocks are incorporated within the 192-

frame S/PDIF Block. For Consumer mode only the first 40-frames are used to make up the Channel

and User blocks. Figure 32 illustrates the S/PDIF format.

. . . . . . . . .

Frame

192

Frame

Subframe 1

Subframe 2

Sync

preamble

Aux

Audio Sample Word

3 4

7 8

27 28

32 bit

Word

Figure 32 S/PDIF Format

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