WM9704CFTSLASHV datasheet(17/37 Pages) WOLFSON

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WM9704M

WOLFSON MICROELECTRONICS LTD

PD Rev 3.2 January 2001

AC-LINK DIGITAL SERIAL INTERFACE PROTOCOL

The WM9704M incorporates a 5-pin digital serial interface that links it to the AC’97 controller. AC-link

is a bi-directional, fixed rate, serial PCM digital stream. It handles multiple input and output audio

streams, as well as control register accesses employing a time division multiplexed (TDM) scheme.

The AC-link architecture divides each audio frame into 12 outgoing and 12 incoming data streams,

each with 20-bit sample resolution. With a minimum required DAC and ADC resolution of 16-bits,

AC’97 may also be implemented with 18 or 20-bit DAC/ADC resolution, given the headroom that the

AC-link architecture provides. The WM9704M provides support for 18-bit operation.

SLOT

NUMBER

SYNC

SDATA_OUT

SDATA_IN

TAG

CMD

ADR

CMD

DATA

PCM

LEFT

PCM

RIGHT

LINE 1

DAC

PCM

LFE

LINE 2

DAC

HSET

DAC

TAG

STATUS

ADDR

STATUS

DATA

PCM

LEFT

PCM

RIGHT

LINE 1

ADC

MIC

ADC

RSRVD

LINE 2

ADC

HSET

ADC

STATUS

0123

4567

PCM

CENTRE

PCM

L SURR

PCM

R SURR

CTRL

PCM C

(n+1)

PCM R

(n+1)

PCM L

(n+1)

CODEC ID

SLOTREQ 3-12

Figure 8 AC’97 Standard Bi-directional Audio Frame

SYNC

BIT_CLK

SDATA_OUT

VALID

FRAME

SLOT(1)

SLOT(2)

SLOT(12)

’0’

(ID1)

(ID0)

TAG PHASE

DATA PHASE

20.8

µS (48kHz)

12.288MHz

81.4nS

END OF PREVIOUS

AUDIO FRAME

TIME SLOT ’VALID’ BITS

(’1’ = TIME SLOT CONTAINS

VALID PCM DATA)

SLOT (1)

SLOT (2)

SLOT (3)

SLOT (12)

Figure 9 AC-link Audio Output Frame

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