DS3163 Maxim Integrated Products, DS3163 Datasheet - Page 161

• Manufacturer Part Number: DS3163
• Description: IC TRPL ATM/PACKET PHY 400-PBGA
• Manufacturer: Maxim Integrated Products

Specifications of DS3163

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 400-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

the multiframe alignment bits M
framer is an off-line framer that only updates the data path frame counters when either an out of frame (OOF) or an
out of multiframe (OOMF) condition is present. The use of an off-line framer reduces the average time required to
reframe, and reduces data loss caused by burst error. The DS3 framer has a Maximum Average Reframe Time
(MART) of approximately 1.0 ms.
Figure 10-38. DS3 Frame Format
The subframe framer continually searches four adjacent bit positions for a subframe boundary. A subframe
alignment bit (F-bit) checker checks each bit position. All four bit positions must fail before any other bit positions
are checked for a subframe boundary. There are 170 possible bit positions that must be checked, and four
positions are checked simultaneously. Therefore, up to 43 checks may be needed to identify the subframe
boundary. The subframe framer enables the multiframe frame once it has identified a subframe boundary. See
Figure 10-39
M
M
M
X
X
P
P
1
2
1
2
1
2
3
F
F
F
F
F
F
F
for the subframe framer state diagram.
11
21
31
41
51
61
71
C
C
C
C
C
C
C
11
21
31
41
51
61
71
1
, M
2
, and M
F
F
F
F
F
F
F
12
22
32
42
52
62
72
3
, which have a value of zero, one, and zero respectively. The DS3
680 Bits
C
C
C
C
C
C
C
12
22
32
42
52
62
72
F
F
F
F
F
F
F
13
23
33
43
53
63
73
C
C
C
C
C
C
C
13
23
33
43
53
63
73
F
F
F
F
F
F
F
14
24
34
44
54
64
74
7 Sub-
Frames