WM9713L datasheet(20/108 Pages) WOLFSON

20 / 108 page

WM9713L

Pre-Production

PP Rev 3.0 June 2006

Figure 4 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/design/chipsets/audio/

Note:

SDATAOUT and SYNC must be held low 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 SDATAOUT or SYNC is high during reset, the WM9713L 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.

PCM INTERFACE

OPERATION

WM9713L can implement a PCM voice codec function using the dedicated VXDAC and either one or

both of the existing hi-fi ADC’s. In PCM codec mode, VXDAC input and ADC output are interfaced

via a PCM style port via GPIO pins.

This interface can support one ADC channel, or stereo/dual ADC channels if required, (two channels

of data are sent per PCM frame as back to back words).

In voice only mode, the AC link is used only for control information, not audio data. Therefore it will

generally be shut down (PR4=1), except when control data must be sent.

The PCM interface makes use of 4 of the GPIO interface pins, for clock, frame, and data in/out. If the

PCM codec function is not enabled then the GPIO pins may be used for other functions.

INTERFACE PROTOCOL

The WM9713L PCM audio interface is used for the input of data to the Voice DAC and the output of

data from the Stereo ADC. When enabled, the PCM audio interface uses four GPIO pins:

•

GPIO1/PCMCLK: Bit clock

•

GPIO3/PCMFS: Frame Sync

•

GPIO4/PCMDAC: Voice DAC data input

•

GPIO5/PCMADC: Stereo ADC data output

Depending on the mode of operation (see “PCM Interface Modes”), at least one of these four pins

must be set up as an output by writing to register 4Ch (see Table 62). When not enabled the GPIOs

may be used for other functions on the WM9713L.

WM9713L Datasheet(PDF) 20 Page - Wolfson Microelectronics plc