MAS3587F datasheet(8/82 Pages) MICRONAS

8 / 82 page

MAS 3587F

ADVANCE INFORMATION

Micronas

2.5. Firmware and Software

2.5.1. Internal Program ROM and Firmware,

MPEG-Encoding/Decoding

The firmware implemented in the program ROM of the

MAS 3587F provides MPEG 1/2 Layer 3 encoding and

decoding

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.

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 I2C instructions that give access to

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.

Fig. 2–2: Encoder Signal Flow

Fig. 2–3: Decoder Signal Flow

OUT

A/D

Audio

Proc.

D/A

Encoder

MIX

SDO

S/PDIF

PIO

S/PDIF

S/PDIF2

SDI

LINE IN

MIC IN

OUT

A/D

Audio

Proc.

D/A

Decoder

MIX

SDO

S/PDIF

PIO

SDIB

LINE IN

DSP

Volume

Matrix

MIC IN

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