WM9704M 查看數據表（PDF） - Wolfson Microelectronics plc
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WM9704M Datasheet PDF : 37 Pages
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WM9704M
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
0
1
2
3
4
5
6
7
8
9
10 11 12
SYNC
TAG
SDATA_OUT
CODEC ID
CMD
ADR
CMD
DATA
PCM
LEFT
SDATA_IN
TAG
STATUS STATUS
ADDR
DATA
SLOTREQ 3-12
PCM
LEFT
PCM
RIGHT
LINE 1
PCM
PCM
PCM
DAC CENTRE L SURR R SURR
PCM
LFE
LINE 2
DAC
PCM L
(n+1)
HSET
DAC
PCM R
(n+1)
IO
CTRL
PCM C
(n+1)
PCM
RIGHT
LINE 1
ADC
MIC
ADC
RSRVD RSRVD RSRVD
LINE 2
ADC
HSET
ADC
IO
STATUS
Figure 8 AC’97 Standard Bi-directional Audio Frame
SYNC
BIT_CLK
TAG PHASE
12.288MHz
81.4nS
DATA PHASE
20.8µS (48kHz)
SDATA_OUT
VALID
FRAME
SLOT(1)
SLOT(2)
SLOT(12) ’0’ (ID1) (ID0) 19
0
END OF PREVIOUS
AUDIO FRAME
TIME SLOT ’VALID’ BITS
(’1’ = TIME SLOT CONTAINS
VALID PCM DATA)
SLOT (1)
19
0
SLOT (2)
19
0
SLOT (3)
Figure 9 AC-link Audio Output Frame
19
0
SLOT (12)
WOLFSON MICROELECTRONICS LTD
PD Rev 3.2 January 2001
17
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