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TWR-AUDIO-DA7321 User Manual Rev0.3 - June 2013 3

TWR-AUDIO-DA7321 USER MANUAL

2.3 MCLK Source

The MCLK signal supplied to the DA7321 can be sourced from the on-board I2C programmable

oscillator (Y1) set to 24.576MHz as default. The oscillator used is the Si5351A-B02075-GT from

Silicon Labs. It can be programmed via the I2C interface.

The fixed I2C device address for the Si5351is:

• Write = 0x60h

• Read = 0x61h

Alternatively, the Primary Tower Elevator connector signal I2S0_MCLK (A21) can be used.

The required source can be selected via J2.

Jumper Functionality Setting Description

MCLK Source Select 1-2

2-3

Tower Elevator I2S0_MCLK

On-board (24.576MHz) oscillator

Table 1 J2 MCLK Source Select

2.4 Interfaces

2.4.1 Level-Shift

The Tower platform is configured for all the digital I/O to run at 3.3V.

To offer flexibility around the configuration options, all of the logic signals to/from the TWR-AUDIO-

DA7321 are level-shifted from 3.3V to IOVDD (the default configuration is IOVDD running from the

on-board 1.6V regulator).

Master and Slave modes are supported via the jumper link on J1. This jumper allows the direction of

BCLK and LRCLK to switch direction.

Jumper Functionality Setting Description

Master/Slave Select 1-2

2-3

Slave Mode (pull-up)

Master Mode (pull-down)

Table 2 J1 Master/Slave Select

2.4.2 I2S

The I2S interface is used to receive and transmit the audio data between the DA7321 and the

processor used in the Tower platform.

The I2S interface consists of a Word Clock (WCLK), a data clock (BCLK), a serial data input (DI) and

a serial data output (DO).

These signals are connected directly between the DA7321 and the Primary Tower Elevator

connector.

2.4.3 I2C

The I2C interface is used to transmit the DA7321 control data as well as readback the settings as

required.

The I2C interface consists of a data clock (SCL) and a serial data input/output (SDA).

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