mt9079apr1 Zarlink Semiconductor, mt9079apr1 Datasheet - Page 13

• Manufacturer Part Number: mt9079apr1
• Description: Advanced Controller For E1
• Manufacturer: Zarlink Semiconductor

Table 5 illustrates the organization of the MT9079 transmit and receive national bit buffers. Each row is an
addressable byte of the MT9079 national bit buffer, and each column contains the national bits of an odd numbered
frame of each CRC-4 Multiframe.
The transmit and receive national bit buffers are selectible in microprocessor or microcontroller modes, but cannot
be accessed in ST-BUS mode. In ST-BUS mode access to the national bits can be achieved through the Transmit
and Receive Non-frame Alignment Signal (CSTi0 and CSTo). When selected, the Data Link (DL) pin functions
override the transmit national bit buffer function.
The CALN (CRC-4 Alignment) status bit and maskable interrupt CALNI indicate the beginning of every received
CRC-4 multiframe.
i
ndicates position of CRC-4 multiframe alignment signal.
CRC
0/FAS
1/NFAS
2/FAS
3/NFAS
4/FAS
5/NFAS
6/FAS
7/NFAS
8/FAS
9/NFAS
10/FAS
11/NFAS
12/FAS
13/NFAS
14/FAS
15/NFAS
Frame/
CRC
Type
Table 4 - FAS and NFAS Structure
Zarlink Semiconductor Inc.
C
C
C
C
C
C
C
C
E
E
1
0
0
1
0
1
1
1
2
3
4
1
2
3
1
4
2
MT9079
2
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
PCM 30 Channel Zero
ALM S
ALM S
ALM S
ALM S
ALM S
ALM S
ALM S
ALM S
13
3
0
0
0
0
0
0
0
0
4
1
1
1
1
1
1
1
1
a4
a4
a4
a4
a4
a4
a4
a4
S
S
S
S
S
S
S
S
5
1
1
1
1
1
1
1
1
a5
a5
a5
a5
a5
a5
a5
a5
S
S
S
S
S
S
S
S
6
0
0
0
0
0
0
0
0
a6
a6
a6
a6
a6
a6
a6
a6
S
S
S
S
S
S
S
S
7
1
1
1
1
1
1
1
1
a7
a7
a7
a7
a7
a7
a7
a7
S
S
S
S
S
S
S
S
8
1
1
1
1
1
1
1
1
a8
a8
a8
a8
a8
a8
a8
a8
Data Sheet