MAS3549F datasheet(36/92 Pages) MICRONAS

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MAS 35x9F

DATA SHEET

June 30, 2004; 6251-505-1DS

Micronas

D0:34d

Operation Mode Selection (reset = 0

hex)

G.729

The register is used to switch between basic G.729 operation modes.

bit[19:7]

Reserved, set to 0

bit[6]

Page headers

enable

disable

If the page headers bit is 0, a header frame is transfered before each page of

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

Please (see Section 3.3.8. on page 44).

bit[5:4]

Decoding speed

8 kHz (normal)

6 kHz (slow)

12 kHz (fast)

not allowed

The recording (encoding) is always done with a sampling rate of 8 kHz. During

decoding this control can be used to speed up or slow down the playback.

bit[3]

Reserved, set to 0

bit[2]

Pause encoder/decoder

normal operation

pause

If the pause bit is set, the processing continues until the current page is fin-

ished and then en-/decoding is paused. The pause mode lasts until the pause

bit is cleared again or the mode is set to 0.

bit[1:0]

Mode

idle

decode

not allowed

encode

To switch to

encoder operation mode, UserControl has to be set to 3

hex. Then

50 frames are encoded and sent via the PIO interface. This is repeated until

the UserControl register is changed. If the transmission of headers is enabled,

each page of 50 frames is preceeded by a header frame as shown in Fig. 3–4

on page 44.

To switch to

decoder operation mode, UserControl has to be set to 1

hex. For

decoding with slow speed, UserControl must be 11hex, for decoding with fast

speed it must be 21hex. Then the decoder is requesting several frames via the

PIO interface to fill its internal buffer. If enough data is available, 50 frames are

decoded. This is repeated until the UserControl register is changed. If the

transmission of headers is enabled, a header frame has to be sent before

each page of 50 frames (see Fig. 3–4 on page 44).

To switch off the encoder or decoder, UserControl has to be set to 0hex. Then

the encoding/decoding and sending/receiving of frames continues until the

end of the current page and the operation mode is set to stop.

UserControl

Table 3–9: D0 control memory cells, continued

Memory

Address

(hex)

Function

Name

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