MAS3507D Micronas Intermetall, MAS3507D Datasheet - Page 34

• Manufacturer Part Number: MAS3507D
• Description: Mpeg 1/2 Layer 2/3 Audio Decoder
• Manufacturer: Micronas Intermetall

MAS 3507D
3.7.1.6. Ancillary Data
This memory field contains the ancillary data. It is organized in words 16 bit each. The last ancillary bit transmitted in
a frame is placed at bit 0 in D0:$305. The position of the first ancillary data bit is locatable via the content of Number-
OfAncillaryBits.
An example: 17 bits ancillary data in a frame:
A possible ‘ read ancillary data ’ algorithm would read the NumberOfAncillaryBits and the complete ancillary data
area using the telegram:
<$3a><$68><$31><$1e> (offset=4, n=30)
<$3a><$69><$3b><receive 30 16-bit words>
For reducing the I
part that reads NumberOfAncillaryBits and a second that reads only NumberOfAncillaryBits/16+1 words.
Table 3–13: Ancillary data bit assignment
Table 3–14: Ancillary data bit assignment
34
D0: $305
ancillary data
D0: $306
ancillary data
Address
D0:$305 ...
D0:$321
15 MSB 14
bit 1
15 MSB 14
x
Offset
2
5
C protocol transfer traffic, it may be useful to split up the ‘read ancillary data’ algorithm into a first
bit 2
x
13
bit 3
13
x
R/W
r
12
bit 4
12
x
Name
AncillaryData
11
bit 5
11
x
10
bit 6
10
x
09
bit 7
09
x
08
bit 8
08
x
07
bit 9
07
x
Function
organized in words a 16 bit (MSB first)
06
bit 10
06
x
05
bit 11
05
x
04
bit 12
04
x
PRELIMINARY DATA SHEET
03
bit 13
03
x
02
bit 14
02
x
01
bit 15
01
x
Micronas
00 LSB
bit 16
00 LSB
bit 0