MAS3587F datasheet(33/82 Pages) MICRONAS

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ADVANCE INFORMATION

MAS 3587F

Micronas

Table 3–6: Application Control and Status

Memory

Address

(hex)

Function

Name

D0:7f6

Application Selection

All

AppSelect is used for selecting an application. This is done by setting the

appropriate bit to one. It is principally allowed to set more than one bit to one,

e.g. setting AppSelect to 0xc will select all MPEG audio decoders. The auto-

detection feature will automatically detect the Layer 2 or Layer 3 data. When

bit[0]/bit[1] are asserted, the DSP begins to loop inside the OS loop/Top Level

loop respectively.

It is recomended to perform the necessary settings for the firmware before the

application is started by writing this memory cell.

bit[6]

MPEG Layer 3 Encoder

bit[3]

MPEG Layer 3 Decoder

bit[2]

MPEG Layer 2 Decoder

bit[1]

Top Level

bit[0]

Operating System

AppSelect

D0:7f7

Application Running

All

The AppRunning cell is a global user interface status cell, that indicates which

application loop is actually running. After writing AppSelect, it has to be

checked whether the appropriate bit(s) in the AppRunning cell is set, prior to

any changes in the configuration registers or memory cells

bit[6]

MPEG Layer 3 Encoder

bit[3]

MPEG Layer 3 Decoder

bit[2]

MPEG Layer 2 Decoder

bit[1]

Top Level

bit[0]

Operating System

AppRunning

D0:7f0

Encoder Control (reset = a0264hex)

Encoder

EncoderControl is used for selecting the quality level, sample frequency and

other options for encoding.

bit[19:17]

Quality Setting

000

0 lowest bitrate / quality

001

010

011

100

101 (reset) 5 recommended quality

The maximum bitrate is limited to 192 kbit/s,

whereas the average bitrate highly depends on the

audio source. At the recommanded quality

setting and a sampling rate of 44.1 kHz, the average

bitrate is typically found in the range from 130 to

140 kBit/s.

110

111

7 highest bitrate / quality

bit[16:12]

Reserved, must be set to zero

...

EncoderControl

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