MAS3587F Micronas, MAS3587F Datasheet - Page 8

• Manufacturer Part Number: MAS3587F
• Description: MPEG Layer 3 Audio Encoder/Decoder
• Manufacturer: Micronas

MAS 3587F
2.5. Firmware and Software
2.5.1. Internal Program ROM and Firmware,
The firmware implemented in the program ROM of the
MAS 3587F provides MPEG 1/2 Layer 3 encoding and
decoding of MPEG 1/2 Layer 2 and MPEG 1/2
Layer 3.
The DSP operating system starts the firmware in the
“Application Selection Mode”. By setting the appropri-
ate bit in the Application Select memory cell (see
Table 3–6 on page 33), the MPEG audio encoder or
decoder can be activated.
Fig. 2–2: Encoder Signal Flow
Fig. 2–3: Decoder Signal Flow
8
S/PDIF
S/PDIF2
SDI
LINE IN
MIC IN
PIO
SDIB
LINE IN
MIC IN
MPEG-Encoding/Decoding
A/D
A/D
Decoder
Volume
Matrix
DSP
The MPEG decoder provides an automatic standard
detection mode. If all MPEG audio decoders are
selected, the Layer 2 or Layer 3 bitstream is recog-
nized and decoded automatically.
For general control purposes, the operation system
provides a set of I
internal DSP registers and memory areas.
An auxiliary digital volume control and mixer matrix is
applied to the digital stereo audio data. This matrix is
capable of performing the balance control and a simple
kind of stereo basewidth enhancement. All four factors
LL, LR, RL, and RR are adjustable, please refer to Fig.
3–3 on page 41.
MIX
MIX
Encoder
Audio
Proc.
Audio
Proc.
2
C instructions that give access to
ADVANCE INFORMATION
D/A
D/A
PIO
S/PDIF
SDO
OUT
S/PDIF
SDO
OUT
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