wm9712l Wolfson Microelectronics plc, wm9712l Datasheet - Page 58

• Manufacturer Part Number: wm9712l
• Description: Ac?97 Audio And Touchpanel Codec
• Manufacturer: Wolfson Microelectronics plc

WM9712L
w
AC97 DATA AND CONTROL INTERFACE
INTERFACE PROTOCOL
The WM9712Lhas a single AC’97 interface for both data transfer and control. The AC-Link uses 5
wires:
•
•
•
•
•
Figure 16 AC-Link Interface (typical case with BITCLK generated by the AC97 codec)
The SDATAIN and SDATAOUT signals each carry 13 time-division multiplexed data 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, touchpanel, AUXDAC, 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.
CONTROLLER
SDATAIN (pin 8) carries data from the WM9712L to the controller
SDATAOUT (pin 5) carries data from the controller to the WM9712L
BITCLK (pin 6) is a clock, normally generated by the WM9712L crystal oscillator and
supplied to the controller. However, BITCLK can also be passed to the WM9712L from
an off-chip generator.
SYNC is a synchronization signal generated by the controller and passed to the
WM9712L
RESETB resets the WM9712L to its default state
e.g. CPU
SDATAOUT
SDATAIN
AC-LINK
RESETB
BITCLK
SYNC
WM9712L
PD Rev 4.5 August 2006
24.576MHz
XTAL
ANALOGUE
OUTPUTS
INPUTS /
Production Data
58