MAS3549F datasheet(43/92 Pages) MICRONAS

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DATA SHEET

MAS 35x9F

Micronas

June 30, 2004; 6251-505-1DS

3.3.5. Ancillary Data

The memory fields D0:FD5...D0:ff1 contain the ancil-

lary data. It is organized in 28 words of 16 bit each.

The last ancillary bit of a frame is placed at bit 0 in

D0:FD5. The position of the first ancillary data bit

received can be located via the content of

NumberOfAncillaryBits because

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

of memory words are used.

Example:

First get the content of ‘NumberOfAncillaryBits’

Assume that the MAS 35x9F has received 19 ancillary

data bits. Therefore, it is necessary to read two 16-bit

words:

<DW 68 c4 00

Short Read from D0

00 02 0f d5>

read 2 words starting at D0:fd5

<DW 69 <DR dd dd

dd dd>

receive the 2 16-bit words

The first bit received from the MPEG source is at posi-

tion 2 of D0:FD6; the last bit received is at the LSB of

D0:fd5.

3.3.6. Reading of the Memory Cells “Number of

Bits in Ancillary Data” and “Ancillary Data”

When in Broadcast Mode, reading of the cells “Num-

ber of Bits in Ancillary Data” and “Ancillary Data” will

lead to unpredictable results. These cells are

described in Table 3–11 on page 43.

The same applies to the “Number of Bits in Ancillary

Data” and “Ancillary Data” of the preliminary data

sheet MAS 3587F.

Table 3–12: Content of D0:fd5 after reception of 19 ancillary bits.

D0:fd5

MSB

LSB

Ancillary

Data

4th

bit

5th

bit

6th

bit

...

17th

bit

18th

bit

last

bit

Table 3–13: Content of D0:fd6 after reception of 19 ancillary bits.

D0:fd6

MSB

LSB

Ancillary

Data

xxx

first

bit

2nd

bit

3rd

bit

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