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3-56 Copyright © 2003-2007 ARM Limited. All rights reserved. ARM DUI 0224F
3.6 Advanced Audio Codec Interface, AACI
The FPGA contains an ARM PrimeCell Advanced Audio CODEC Interface (AACI)
that provides communication with a CODEC using the AC-link protocol. This section
provides a brief overview of the AACI. For detailed information, see PrimeCell
Advanced Audio CODEC Interface (PL041) Technical Reference Manual.
Note
For a description of the audio CODEC signals, refer to the LM4549 datasheet available
from the National Semiconductor website. See also Advanced Audio CODEC Interface,
AACI on page 4-42.
The AACI on the PB926EJ-S connects to a National Semiconductor LM4549 audio
CODEC. The audio CODEC is compatible with AC’97 Rev 2.1. Table 3-12 lists the
specifications for the audio system.
Figure 3-24 on page 3-57 shows the architecture of audio interface.
Table 3-12 Audio system specification
Characteristic Value
Raw digital audio data format PCM
Number of audio channels Out 2 (stereo)
In 1 of 2 (mono)
Audio sample data width 12, 16 or 18-bit native. Other data sizes require software
conversion of sample data.
Sample rates supported 4kHz to 48kHz, variable in 1Hz steps. Record and
playback sample rates can be independently selected.
Audio power output 250mWRMS into 32Ω