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Circuit Descriptions
EN 48 Q549.2E LA7.
2009-May-08
Figure 7-9 PNX8543 audio flow diagram
The Audio Subsystem consist of the following blocks:
• Analogue Audio Front End (AAFE) used to capture
Baseband Audio Inputs and to sample Secondary Sound
IF (SSIF) directly or via Low-IF input
• HDMI Receiver interface block
• SPDIF input block
• Audio Input (AI) block
• Audio Output (AO) block
• Demodulation & Decoding (ASDEC) DSP for decoding all
analogue terrestrial TV sound standards
• Audio Post-Processing (APP) block
• Digital Audio decoder.
7.5.3 Connectivity and Compute Subsystem
Refer to Figure 7-10
for the connectivity and compute
subsystem.
18440_204_090226.eps
090226
VMSP
ADC
MCU
DDR2-SDRAM
PNX8543x
HDMI_RX
CAI
SPDIF-IN
I
2
S
SPDIF
DigIF
ASDEC
(DEMODULATION
AND DECODING)
TM2270
(MPEG, AC-3, MP3
DECODER)
SPDIF-OUT
AO
AI
APP - AUDIO DSP
(POST PROCESSING)
2
DAC
2
DAC
2
DAC
2
DAC
DMA BUS
I2S-OUT-SD3
I2S-OUT-SD4
I2S-OUT-WS
I2S-OUT-SCK
I2S-OUT-OSC
Main L, R
HP L, R
SCART2 L, R
SCART1 L, R
HDMI
SPDIF-IN1
IF
SSIF
L, R
TS-IN
SPDIF-Out
SPDIF-IN2
I2S-OUT-SD1
I2S-OUT-SD2
I2S-IN-SD3
I2S-IN-SD4
I2S-IN-WS
I2S-IN-SCK
I2S-IN-OSC
I2S-IN-SD1
I2S-IN-SD2
SPDIF
ADC
4
4 × I
2
S
4
4 × I
2
S
XB3
XB4
from
XB4
fast SPDIF
XB1
XB2
4 × I
2
S