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WM9711 Datasheet(PDF) 46 Page - Wolfson Microelectronics plc

Part # WM9711
Description  LOW POWER AUDIO CODEC FOR PORTABLE APPLICATIONS
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM9711 Datasheet(HTML) 46 Page - Wolfson Microelectronics plc

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WM9711L
Production Data
w
PD Rev 4.1 April 2004
46
AC97 DATA AND CONTROL INTERFACE
INTERFACE PROTOCOL
The WM9711Lhas a single AC’97 interface for both data transfer and control. The AC-Link uses 5
wires:
SDATAIN (pin 8) carries data from the WM9711L to the controller
SDATAOUT (pin 5) carries data from the controller to the WM9711L
BITCLK (pin 6) is a clock, normally generated by the WM9711L crystal oscillator and
supplied to the controller. However, BITCLK can also be passed to the WM9711L from
an off-chip generator.
SYNC is a synchronization signal generated by the controller and passed to the
WM9711L
RESETB resets the WM9711L to its default state
CONTROLLER
e.g. CPU
WM9711L
RESETB
SDATAIN
SDATAOUT
BITCLK
SYNC
24.576MHz
XTAL
AC-LINK
ANALOGUE
INPUTS /
OUTPUTS
Figure 8 AC-Link Interface (typical case with BITCLK generated by the AC97 codec)
The SDATAIN and SDATAOUT signals each carry 13 time-division multiplexed dat
a streams (slots 0 to 12). A complete sequence of slots 0 to 12 is referred to as an AC-Link frame,
and contains a total of 256 bits. The frame rate is 48kHz. This makes it possible to simultaneously
transmit and receive multiple data streams (e.g. audio in, audio out, AUXDAC, GPIO, control) at
sample rates up to 48kHz.
Detailed information can be found in the AC’97 (Revision 2.2) specification, which can be obtained at
www.intel.com/labs/media/audio/
Note:
SDATAOUT and SYNC must be held low for when RESETB is applied. These signals must be held
low for the entire duration of the RESETB pulse and especially during the low-to-high transition of
RESETB. If either is set high during reset the AC'97 device may enter test modes.
Information
relating to this operation is available in the AC'97 specification or in Wolfson applications note WAN-
0104 available at www.wolfsonmirco.com.


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