The SHARC Audio Module uses the ADSP-SC589 SHARC processor along with an ADAU1761 SigmaDSP audio codec and an AD2428W A2B transceiver in a compact form for audio development.

The SHARC Audio Module Main Board

Block Diagram of the SHARC Audio Module Main Board

• SPI flash and DDR memory changed to drop in replacements from ISSI
• FTDI header was replaced with an FTDI chip on board along with a USB connector so no need for a separate FTDI cable
• UART boot was fixed
• USB and Ethernet jacks are now combined into one jack

The SHARC Audio Module is powered by the Analog Devices, Inc. ADSP-SC589 SHARC DSP. The ADSP-SC589 contains an ARM Cortex-A5 and Dual SHARC+ cores running at 450 MHz.

There are two DDR3 channels on the SHARC Audio Module, each with a 2Gbit DDR3 module. In the default SHARC Audio Module configuration, one DDR3 module is used for Linux and the other used by the SHARC+ cores for audio processing.

A 512Mbit SPI Flash on the SHARC Audio Module that is ready to be programmed with a users desired audio application.

The SHARC Audio Module has a 10/100/1000 Ethernet module to provide network and internet access to the board.

The USB Type A port is Host mode only, and is for USB WiFi, Bluetooth and USB memory devices. The connector is combined with the Ethernet jack.

The USB MicroAB can be a Host/Device or OTG connection. This interface can be used for USB Audio, along with the USBi Emulator.

This connector is for USB to UART communication using UART0 on the ADSP-SC589 processor.

The A2B bus uses crossover cables to connect nodes to each other. P6 connects to upstream towards the Master Node in the network and P7 connects downstream to the next slave in the network. The SHARC Audio Module uses the AD2428W IC.

• BLCK is connected to DAI0_PIN07
• SYNC is connected to DAI0_PIN08
• DTX0 is connected to DAI0_PIN09
• DTX1 is connected to DAI0_PIN10
• DRX0 is connected to DAI0_PIN11
• DRX1 is connected to DAI0_PIN12

The ADAU1761 is a low power, stereo audio codec with integrated digital audio processing that supports stereo 48 kHz record and playback. The stereo audio ADCs and DACs support sample rates from 8 kHz to 96 kHz as well as a digital volume control.

The SigmaDSP® core features 28-bit processing (56-bit double precision). The processor allows system designers to compensate for the real-world limitations of microphones, speakers, amplifiers, and listening environments, resulting in a dramatic improvement in the perceived audio quality through equalization, multiband compression, limiting, and third-party branded algorithms.

The ADAU1761 is connected to the DAI ports on the ADSP-SC589 as follows:

• DAC_SDATA is connected to DAI0_PIN01
• ADC_SDATA is connected to DAI0_PIN02
• BCLK is connected to DAI0_PIN03
• LRCLK is connected to DAI0_PIN04

The 3.5mm Audio In/Out jacks are connected to the ADAU1761 SigmaDSP.

The impedance of the 3.5mm signals is 16 ohms. The HP output pins to the expansion connectors are also 16 ohms.

The SPDIF jacks are connected to the DAI ports on the ADSP-SC589.

• SPDIF Input is connected to DAI0_PIN19.
• SPDIF Output is connected to DAI0_PIN20.

The USBi Connector on the SHARC Audio module allows for the use of the USBi adapter for bare metal programming.

The SHARC Audio Module was design for a 12V DC input, but can operated from 10v to 20v input to the barrel jack. A 12v 1.5A DC power supply is recommended. The barrel connector on the SHARC Audio Module can handle up to 3A current.

The MicroSD card slot on the SHARC Audio Module can be used to store the Linux OS as well as other data.

The JTAG interface allows for programming and debugging of the ADSP-SC589 using an ICE-1000 or an ICE-2000 emulator and CrossCore Embedded Studio.

The ADSP-SC589 has multiple boots modes. This jumper allows for three of the supported boot modes on the DSP, depending on jumper setting.

Two GPIO pushbuttons are provided on the SHARC Audio Model. They are connected as follows:

• PB1 is connected to PF_00
• PB2 is connected to PF_01

The Reset button resets all the hardware on the SHARC Audio Module. It will not reset anything on connected to the expansion connectors.

There are three GPIO controlled LEDs on the SHARC Audio Module. They are connected as follows:

• LED10 is connected to PD_01
• LED11 is connected to PD_02
• LED12 is connected to PD_03

The SHARC Audio Module has a TWI switch the can connect TWI0 or TWI1 on the ADSP-SC589 to the A2B and ADAU1761 on the board. This allows either the ARM core or the SHARC+ cores to access the A2B and ADAU1761 TWI control lines. PB_08 controls the switch.