MAS3549F datasheet(32/92 Pages) MICRONAS

32 / 92 page

MAS 35x9F

DATA SHEET

June 30, 2004; 6251-505-1DS

Micronas

3.3.4.1. Application Selection and

Application Running

The AppSelect cell is a global user interface configura-

tion cell, which has to be written in order to start a spe-

cific application.

The AppRunning cell is a global user interface status

cell, which indicates, which application loop is actually

running.

1. Write “0” to AppSelect

2. Check AppRunning for “0”

3. Write value to AppSelect according to Table 3–8

(determines start time of Application program)

4. Apply necessary/wanted control settings

(D0:346..357)

3.3.4.2. Application Specific Control

The configuration of the MPEG Layer 2/3, AAC decod-

ing and the G.729 codec firmware is done via the con-

trol memory cells described in Table 3–9. The changes

applied to any of the control memory cells have to be

validated by setting bit[0] of memory cell Main I/O Con-

trol. This bit will be reset automatically after the

changes have been taken over by the DSP.

The status memory cells in Table 3–11 are used to

read the decoder status and to get additional MPEG

bitstream information.

Note: DSP memory cells not given in Table 3–8 or

Table 3–9 must not be written.

Table 3–8: D0 control memory cells: mode selection

Memory

Address

(hex)

Function

Name

D0:34b

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 1Chex will select all MPEG audio decoders. The

auto-detection feature will automatically detect the Layer 2, Layer 3, or AAC

data. Setting bit[0] or bit[1] will make the DSP loop in the OS loop or the Top

Level loop respectively.

To add/remove MPEG layers while running in MPEG decoding mode (e.g.

change from Layer 2, Layer 3 (0Chex) to Layer 2, Layer 3, AAC (1Chex)), the

application selection has to be reset to 00hex before writing the new value.

bit[5]

G.729 Codec

bit[4]

MPEG AAC Decoder

bit[3]

MPEG Layer 3 Decoder

bit[2]

MPEG Layer 2 Decoder

bit[1]

Top Level

bit[0]

Operating System

AppSelect

D0:34c

Application Running

All

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

application loop is actually running. Prior to writing any of the configuration

registers or memory cells (except AppSelect), it has to be checked whether

the appropriate bit(s) in the AppRunning cell is set.

bit[5]

G.729 Codec

bit[4]

MPEG AAC Decoder

bit[3]

MPEG Layer 3 Decoder

bit[2]

MPEG Layer 2 Decoder

bit[1]

Top Level

bit[0]

Operating System

AppRunning

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