MAS3506D datasheet(17/52 Pages) MICRONAS

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PRELIMINARY DATA SHEET

MAS 3506D

Micronas

The data values that are returned are organized in the

following table:

The ancillary data values are copied in the reverse

order into this data field where the last bit received is

place at bit 0 of the data word at offset 3. The number

of data words with content can be calculated as fol-

lows:

int [(NumberOfAncillaryBits-1)/16] + 1

Limitations:

– The maximum number of data words that can be

read out are 28.

– The upper limit for ancillary data bitrate is 9600 bps.

– The ancillary data are only valid for 6 ms after the

MPEG-FRAME-SYNC signal.

Memory example:

The MPEG bitstream contains 20 bits of ancillary data

with the content f0f08hex. Then the ancillary data field

content will be:

Telegram example:

First get the content of ’Number of ancillary bits’:

<3a

device write ( I2C-address)

data write

60 81>

code 6hex, offset 2, count 1:

Get number of ancillary bits

<3a 69 <3b

initiate reading

dd dd >

and read number of bits

Calculate number of words to be read from the number

of bits received (e.g. 20 bits require two words).

<3a

device write (I2C-address)

data write

60 c2>

code 6hex, offset 3, count 2:

Read two words from offset 3.

<3a 69 <3b

initiate reading

dd dd

and read two words

dd dd >

Table 3–7: Content of ancillary data field

Offset

Content

Bit 17..32 of MPEG header1)

1) see address D1:7f6 in Table 3–11 on page 23

Bit 12..16 of MPEG header2)

2) see address D1:7f5 in Table 3–11 on page 23

Number of ancillary data bits

Last 16 bits of ancillary data

...

≤28

First 16 bits of ancillary data

Table 3–8: Ancillary data example

Offset

Content

Bit 17..32 of MPEG header

Bit 12..16 of MPEG header

214hex (number of anc bits)

30f08hex (bit-order reversed)

4xxxfhex

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