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ML505/ML506/ML507 Evaluation Platform
UG347 (v3.1.1) October 7, 2009
Chapter 1:
ML505/ML506/ML507 Evaluation Platform
R
11. Stereo AC97 Audio Codec
The ML50
x
board has an AC97 audio codec (U22) to permit audio processing. The Analog
Devices AD1981 Audio Codec supports stereo 16-bit audio with up to 48-kHz sampling.
The sampling rate for record and playback can be different.
Note:
The reset for the AC97 codec is shared with the reset signal for the flash memory chips and
is designed to be asserted at power-on or at system reset.
Separate audio jacks are provided for Microphone, Line In, Line Out, and Headphone. All
jacks are stereo except for Microphone. The Headphone jack is driven by the audio codec's
internal 50-mW amplifier. The SPDIF jack supplies digital audio output from the codec.
Table 1-12
summarizes the audio jacks.
Table 1-13
shows the control pins for the AC 97 audio codec.
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GPIOLED 1
L18
GPIO LED 1
27
GPIOLED 2
G15
GPIO LED 2
28
GPIOLED 4
G16
GPIO LED 4
29
NC
-
Not Connected
30
NC
-
Not Connected
31
IIC_SCL_EXP
F9
Expansion IIC SCL
32
IIC_SDA_EXP
F8
Expansion IIC SDA
Table 1-11:
Additional Expansion I/O Connections (J5)
(Cont’d)
J5 Pin
Label
FPGA Pin
Description
Table 1-12:
Audio Jacks
Reference Designator
Function
P10
Microphone - In
P11
Analog Line - In
P12
Analog Line - Out
P13
Headphone - Out
P14
SPDIF - Out
Table 1-13:
Audio Codec Control Connections
Net Name
FPGA Pin
AUDIO_BIT_CLK
AF18
AUDIO_SDATA_IN
AE18
AUDIO_SDATA_OUT
AG16
AUDIO_SYNC
AF19
FLASH_AUDIO_RESET_B AG17
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