2/24/2008 9T6WP
Preliminary Hardware Data Module
BCM7405
06/29/07
Functional Description
Bro a d c o m Co rp o r a ti o n
Document
7405-1HDM00-R
Advanced Audio Module Page 1-33
A
DVANCED
A
UDIO
M
ODULE
The audio module consists of two main modules: DSP subsystem and Audio I/O (AIO). The main modules of the DSP
subsystem consist of the DSP, data and instruction memories. The main functions of DSP subsystem include parsing audio
and timing data from data transport, decompressing compressed data, time stamp management, and processing PCM data.
The AIO consists of the FMM, one HIFIDAC, and audio input/output interfaces. The main functions include capturing I
2
S
data, mixing, and volume control of the playback data. It outputs data to I
2
S, SPDIF, HDMI formatter, RF modulator, and
HIFIDAC.
shows the overall block diagram for the audio block.
Figure 1-6: Audio Block Diagram
Analog
Out
SPDIF
Generator
Digital
Audio
Volume
Control
I2S
Converter
M * FS Audio Clock
Data
Path
To RF
Modulator
Audio
DAC
DSP System
To
HDMI
Capture 0
I2S0 In
PLL1
I2S0
Out
M = 128, 192, 256, 384, or 512
PLL0
Buffer
Block
Micro-
Sequencer
To/From
Memory
Arbiter
and
Memory
Controller
M * FS Audio Clock
SRC
IOP