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driver, designed specifically for portable MP3 audio and speech

The WM8731 is a low-power stereo CODEC with an integrated headphone

directly opened in Microsoft Excel.

that matches "standard" descriptive names to actual FPGA pin locations. This file can be

See DE2_pin_assignments.csv, a comma-delimited file

AUD_BCLK Audio CODEC Bit-Stream Clock

AUD_XCK Audio CODEC Chip Clock

AUD_DACDAT Audio CODEC DAC Data

AUD_DACLRCK Audio CODEC DAC LR Clock

AUD_ADCDAT Audio CODEC ADC Data

AUD_ADCLRCK Audio CODEC ADC LR Clock

Table 1. Audio CODEC signal assignments

information for using the WM8731 codec is available in its datasheet.

and the FPGA pin assignments are listed in Table 1. Detailed

A schematic diagram of the audio circuitry is shown in Figure 1,

I2C bus interface, which is connected to pins on the Cyclone II FPGA.

adjustable from 8 kHz to 96 kHz. The WM8731 is controlled by a serial

microphone-in, line-in, and line-out ports, with a sample rate

WM8731 audio CODEC (enCOder/DECoder). This chip supports

The DE2 board provides high-quality 24-bit audio via the Wolfson