参数资料
型号: MAS3587F
厂商: Electronic Theatre Controls, Inc.
元件分类: 通用总线功能
英文描述: MPEG Layer 3 Audio Encoder/Decoder
中文描述: MPEG层3音频编码器/解码器
文件页数: 40/83页
文件大小: 734K
代理商: MAS3587F
MAS 3587F
ADVANCE INFORMATION
40
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
<DW 68 c4 00 00 01 0f d4>
<DW 69 <DR
dd dd
>
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
00
none
01
50/15
μ
s
10
reserved
11
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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