MAS3587F datasheet(40/82 Pages) MICRONAS

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MAS 3587F

ADVANCE INFORMATION

Micronas

3.3.4. 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 NumberO-

fAncillaryBits because

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

of memory words are used.

Example:

First get the content of ’NumberOfAncillaryBits’

Assume that the MAS 3587F 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.

D0:FD2

(continued)

MPEG Header Information, continued

bit[1:0]

Emphasis, indicates the type of emphasis

none

50/15

µs

reserved

CCITT J.17

This memory cell contains the 16 LSBs of the MPEG header. It will be set

directly after synchronizing to the bit stream.

MPEGStatus2

D0:FD3

MPEG CRC Error Counter

Decoder

The counter will be increased by each CRC error detected in the MPEG bis-

stream. It will not be reset when losing the synchronization.

CRCErrorCount

D0:FD4

Number of Bits in Ancillary Data

Decoder

Number of valid ancillary bits in the current MPEG frame.

NumberOfAncillary-

Bits

D0:FD5

...

D0:FF1

Ancillary Data

Decoder

(see Section 3.3.4. on page 40).

AncillaryData

Table 3–8: D0 Status Memory Cells

Memory

Address

Function

Name

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