MAS3549F datasheet(16/92 Pages) MICRONAS

16 / 92 page

MAS 35x9F

DATA SHEET

June 30, 2004; 6251-505-1DS

Micronas

2.9. MPEG Synchronization Output

The signal at pin SYNC is set to ‘1’ after the internal

decoding for the MPEG header has been finished for

one frame. The rising edge of this signal can be used

as an interrupt input for the controller that triggers the

read out of the control information and ancillary data.

As soon as the MAS 35x9F has received the SYNC

reset command (see Section 4.6.2.6. on page 77), the

SYNC signal is cleared. If the controller does not issue

a reset command, the SYNC signal returns to ‘0’ as

soon as the decoding of the next MPEG frame is

started. MPEG status and ancillary data become

invalid until the frame is completely decoded and the

signal at pin SYNC rises again. The controller must

have finished reading all MPEG information before it

becomes invalid. The MPEG Layer 2/3 frame lengths

are given in Table 2–2. AAC has no fixed frame length.

Fig. 2–12: Schematic timing of the signal at pin SYNC.

The signal is cleared at tread when the controller has

issued a Clear SYNC Signal command (see

Section 4.6.2.6. on page 77). If no command is

issued, the signal returns to ‘0’ just before the

decoding of the next MPEG frame.

Table 2–2: Frame length in MPEG Layer 2/3

fs/kHz

Frame Length

Layer 2

Frame Length

Layer 3

24 ms

44.1

26.12 ms

36 ms

24 ms

22.05

26.12 ms

36 ms

not available

48 ms

11.025

not available

52.24 ms

not available

72 ms

tread

tframe = 24...72 ms

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