WM9713 datasheet(23/111 Pages) WOLFSON

23 / 111 page

Preliminary Technical Data

WM9713L

PTD, March 2004, Rev 2.2

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.

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 as on

WM9713L

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

When not enabled the GPIOs may be used for other functions on the WM9713L.

PCM INTERFACE MODES

The WM9713L PCM audio interface may be configured in one of four modes:

•

Disabled Mode: The WM9713L disables and tri-states all PCM interface pins. Any

clock input is ignored and ADC/DAC data is not transferred.

•

Slave Mode: The WM9713L accepts PCMCLK and PCMFS as inputs from an

external source.

•

Master Mode: The WM9713L generates PCMCLK and PCMFS as outputs.

•

Partial Master Mode: The WM9713L generates PCMCLK as an output, and

accepts PCMFS as an external input.

The PCMDAC and PCMADC pins are normally used as DAC input and ADC output respectively. The

WM9713L allows these functions to be swapped allowing DAC input on PCMADC and ADC output

on PCMDAC.

PCM AUDIO DATA FORMATS

Four different audio data formats are supported:

•

DSP mode

•

Left justified

•

Right justified

•

All four of these modes are MSB first. They are described below. Refer to the Electrical

Characteristic section for timing information.

WM9713 Datasheet(PDF) 23 Page - Wolfson Microelectronics plc

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