
DECA User Manual
26
www.terasic.com
May 22, 2015
GPIO1_D[20]
PIN_P9
GPIO (P9) Connection 1[20]
3.3V
GPIO1_D[21]
PIN_V17
GPIO (P9) Connection 1[21]
3.3V
GPIO1_D[22]
PIN_W3
GPIO (P9) Connection 1[22]
3.3V
SYS_RESET_n
PIN_AA2
GPIO (P9) Connection
SYS_RESET_n
3.3V
PWR_BUT
PIN_U6
GPIO (P9) Connection PWR_BUT 3.3V
ADC1IN1
PIN_F5
GPIO (P9) ADC1 Analog Input [1] 2.5V
ADC1IN2
PIN_F4
GPIO (P9) ADC1 Analog Input [2] 2.5V
ADC1IN3
PIN_J8
GPIO (P9) ADC1 Analog Input [3] 2.5V
ADC1IN4
PIN_J9
GPIO (P9) ADC1 Analog Input [4] 2.5V
ADC1IN5
PIN_J4
GPIO (P9) ADC1 Analog Input [5] 2.5V
ADC1IN6
PIN_H3
GPIO (P9) ADC1 Analog Input [6] 2.5V
ADC1IN7
PIN_K5
GPIO (P9) ADC1 Analog Input [7] 2.5V
3.4.4
2
2
4
4
-
-
b
b
i
i
t
t
A
A
u
u
d
d
i
i
o
o
C
C
O
O
D
D
E
E
C
C
The DECA offers high-quality 24-bit audio via the Texas Instruments TLV320AIC3254 audio
CODEC (Encoder/Decoder). This chip on DECA supports, line-in, and line-out ports. One of line-in
inputs is both connected to the FPGA ADC and the audio CODEC ADC, it allows user to
implement audio applications via the MAX 10 build-in ADC. The operational amplifier OPA1612 is
used to make impedance match for the two fanouts from one line-in input. The connection of the
audio circuitry to the FPGA is shown in
Figure 3-18
, and the associated pin assignment to the
FPGA is listed in
Table 3-10
. More information about the TLV320AIC3254 CODEC is available in
its datasheet, which can be found on the manufacturer’s website, or in the directory
\DECA_datasheets\Audio CODEC of DECA System CD.