The SSM2518 is a digital input, Class-D power amplifier that com-bines a digital-to-analog converter (DAC) and a sigma-delta (Σ-Δ) Class-D modulator. This unique architecture enables extremely low real-world power consumption from digital audio sources with excellent audio performance. The SSM2518 is ideal for power sensitive applications, such as mobile phones and portable media players, where system noise can corrupt small analog signals such as those sent to an analog input audio amplifier.

HW Platform(s):

• Spartan-6 LX9 Microboard (Avnet)
• Nexys?3 Spartan-6 FPGA Board (Digilent)
• Avnet ZedBoard
  

The bit file provided in the project *.zip file combines the FPGA bit file and the SDK elf files. It may be used for a quick check on the system. All you need is the hardware and a PC running a UART terminal and the programmer (IMPACT).

• Spartan-6 LX9 Microboard (Avnet)
• Nexys?3 Spartan-6 FPGA Board (Digilent)
• Avnet ZedBoard
• PmodAMP3 (Digilent)

• Xilinx ISE 14.4 (Programmer (IMPACT) is sufficient for the demo and is available on Webpack).
• A UART terminal (Tera Term/Hyperterminal), Baud rate 115200 for the Avnet LX-9 Microboard and ZedBoard or 9600 for the Digilent Nexys?3 Board.

Extract the project from the archive file (SSM2518_.zip) to the location you desire.

To begin, connect the PmodAMP3 to J4 connector of LX9 board. You can use an extension cable for ease of use. Connect the USB cable from the PC to the USB-UART female connector of the board for the UART terminal. The board will be programmed through its USB male connector.

Extract the project from the archive file (SSM2518_.zip) to the location you desire.

To begin, connect the PmodAMP3 to JB connector of Nexys?3 board. You can use an extension cable for ease of use. Connect the USB cables from the PC to the board, one for programming (Digilent USB device) and one for the UART terminal (FT232R USB UART).

To begin, connect the PmodAMP3 to JD connector of ZedBoard (see image below). You can use an extension cable for ease of use. Connect the USB cables from the PC to the board, one for programming (Digilent USB device) and one for the UART terminal (FT232R USB UART).

Program the device using download.bat located in “../sw/bin” folder. The downloading progress will be shown in the command prompt screen that opens.

If programming was successful, you should be seeing messages appear on the terminal window as shown in the figure below. After programming the SSM2518 device, the program will automatically start playing a pre-recorded sound. Press any key to pause/resume playback.

Run the download.bat script from the “../bin” folder downloaded from the github (see the links in the download section of the wiki page). The script will automatically configure the ZYNQ SoC and download the *.elf file afterwards.

If programming was successful, you should be seeing messages appear on the terminal window. After programming the SSM2518 device, the program will automatically start playing a pre-recorded sound.

The reference design is a simple IIC interface used to program the SSM2518. A custom I2S Core is also implemented, in order to transmit audio data to the SSM2518. The software programs the device and starts audio playback. Pausing the audio playback is done from an UART Terminal.

The reference design is a simple IIC interface used to program the SSM2518. A custom I2S Core is also implemented, in order to transmit audio data to the SSM2518. The software programs the device and starts audio playback. DMA transfers data from the DDR memory to the I2S Core, resulting in playback of audio data.

• ask questions about the FPGA reference design
• Example questions:

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