MAS3504D datasheet(18/40 Pages) MICRONAS

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MAS 3504D

Micronas

3.5.2.4. Pause and Mute

If the pause bit is set, the processing continues until

the current page is finished and then en-/decoding is

paused. The pause mode lasts until the pause bit is

cleared again or the mode is set to 0.

If the mute bit is set, the output is muted immediately.

Note that the other bits of the UserControl register

have to stay on their old values when switching to

pause mode.

3.5.3. Volume Control (Reg. FChex)

Volume control is implemented in the MAS 3504D. It

allows to adjust the output volume linear from 0hex

(silence) to 7FFFFhex (original volume).

3.5.4. Interface Control

All the interface control registers have to be written

before the encoder or decoder is started by writing to

the UserControl register. Otherwise they have no

effect until the operation mode is changed.

3.5.4.1. Wordlength Control (Reg. 74hex)

A value of 0hex sets wordlength on SDI and SDO inter-

faces to 32 bit. 1hex sets wordlength to 16 bit.

3.5.4.2. Input Configuration (Reg. 61hex)

The content of this register is set on startup by the

firmware. Additional to the Wordlength setting for the

serial interfaces, some other settings can be made.

3.5.4.3. Output Configuration (Reg. E1hex)

The content of this register is set on startup by the

firmware. Additional to the Wordlength setting for the

serial interfaces, some other settings can be made.

3.5.5. Hardware Control (Reg. FAhex)

The HWControl register is used to set special opera-

tion options.

If the page headers bit is 0, a header frame is trans-

ferred in front of each page of 50 data frames. If the

header bit is 1, all the frames are G.729 data frames.

Bits 2 and 1 are used to select input channels for

encoding. If both bits are set to 0, the left and right

channel are added to get the mono input signal. If only

one of this bits is 1, only the corresponding channel is

used as input.

Fig. 3–2: Schematic timing of the data transmission with preceeding header

...

10ms 10ms ...

...

header

page frame

frame

header

page frame

frame

100 header

page frame

101

frame

102

$64 $6d $72 $31 $64 $61 $74 $61 $f4 $01

byte

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