MAS3506D datasheet(41/52 Pages) MICRONAS

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PRELIMINARY DATA SHEET

MAS 3506D

Micronas

4.6.3.2. Timing of PIO-Signals

Behavior of the FRAME signals

The BC-FRAME-TOGGLE toggles its level from ’1’ to

’0’ and vice-versa every 432 ms. The BC-FRAME-

SYNC signal is set to ’1’ after the internal decoding

process for the Service Control Header has been fin-

ished for one frame. The signal could be used as an

interrupt input for the controller that triggers the read

out of the Service Control Header. As soon as the

MAS 3506D has recognized the corresponding read

command for the SCH, the BC-FRAME-SYNC is reset

before sending the first data word. The time tread

depends on the response time of the controller. This

behavior reduces the possibility of not recognizing the

BC-FRAME-SYNC active state, if no controller inter-

rupt line is available for this purpose.

A similar behavior is implemented for MPEG-FRAME-

SYNC signal. However the frame period is restricted to

the MPEG frame length, the reset is initiated by issuing

a ’Read Ancillary MPEG Data’ command.

Fig. 4–16: Schematic timing of BC-FRAME signals

Table 4–1: PIO Characteristics

Symbol

Parameter

Pin Name

Min.

Typ.

Max.

Unit

Test Conditions

tBCTP

BC-frame toggle time

PI19

432

432 ms

BC-FRAME-TOGGLE (PI 19)

432 ms

BC-FRAME-SYNC (PI13)

tread

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