C.6.7. Audio interface

The baseboard provides a National Semiconductor LM4549 audio CODEC. The audio CODEC is compatible with AC’97 Rev 2.1 and features sample rate conversion and 3D sound. The CODEC is driven with a PrimeCell AACI (PL041) instantiated into the IM-LT3 FPGA and signals the IM-LT3 and baseboard are routed through the HDRB connectors.


For a description of the audio CODEC signals, refer to the LM4549 datasheet available from National Semiconductor.

For detailed information on the AACI, see ARM PrimeCell Advanced Audio CODEC Interface (PL041) Technical Reference Manual.

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