38
VGA_B[0] PIN_A9 VGA Blue[0]
VGA_B[1] PIN_D11 VGA Blue[1]
VGA_B[2] PIN_A10 VGA Blue[2]
VGA_B[3] PIN_B10 VGA Blue[3]
VGA_HS PIN_A11 VGA H_SYNC
VGA_VS PIN_B11 VGA V_SYNC
Table 4.8. ADV7123 pin assignments.
4.7 Using the 24-bit Audio CODEC
The DE1 board provides high-quality 24-bit audio via the Wolfson WM8731 audio CODEC
(enCOder/DECoder). This chip supports microphone-in, line-in, and line-out ports, with a sample
rate adjustable from 8 kHz to 96 kHz. The WM8731 is controlled by a serial I2C bus interface,
which is connected to pins on the Cyclone II FPGA. A schematic diagram of the audio circuitry is
shown in Figure 4.15, and the FPGA pin assignments are listed in Table 4.9. Detailed information
for using the WM8731 codec is available in its datasheet, which can be found on the manufacturer's
web site, and from the Datasheet folder on the DE1 System CD-ROM.
Figure 4.15. Audio CODEC schematic.
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