XRT72L13 Datasheet, PDF (289/370 Pages) Exar Corporation – M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC

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PRELIMINARY
XRT72L13
M13 MULTIPLEXER/CLEAR CHANNEL DS3 FRAMER IC
REV. P1.0.6
FIGURE 84. APPROACH TO INTERFACING THE XRT72L13 FRAMER IC DEVICE TO THE XRT7300 DS3/E3/STS-1
TRANSMITTER LIU
TxSER
TxInClk
TxFrame
NIBBLEINTF
RESETB
INTB
CSB
RW
DS
AS
INTB
A[8:0]
D[7:0]
5V
RxSer
RxClk
RxFrame
RxLOS
RxOOF
RxRED
RxAIS
U1
46
43 ^TxSER
61 ^TxInClk
TxFrame
25
NIBBLEINTF
28
RESETB
13
8 ^INTB
7 ^CSB
10 ^WRB_RW
9 ^RDB_DS
6 ^ALE_AS
Rdy_Dtck
15
16 ^A0
17 ^A1
18 ^A2
19 ^A3
20 ^A4
21 ^A5
22 ^A6
23 ^A7
A8
32
33 ^D0
34 ^D1
35 ^D2
36 ^D3
37 ^D4
38
39
D5
D6
D7
27
MOTO
86
88 ^RxSer
90 ^RxClk
RxFrame
95
94 ^RxLOS
93 ^RxOOF
87 ^RxRED
RxAIS
XRT72L13
65
TxPOS
64
TxNEG
63
TxLineClk
79
DMO
78
ExtLOS
77
RLOL
69
LLOOP
70
RLOOP
68
TAOS
67
TxLEV
ENCODIS ⁶⁶
71
REQB
76
RxPOS
75
RxNEG
74
RxLineClk
U2
37
TPDATA
38
TNDATA
36
TCLK
4
DMO
24
RLOS
23
RLOL
14
LLB
15
RLB
2
TAOS
1
TxLEV
21 _ENCODIS
12
REQDIS
33
RPOS
32
RNEG
31
RCLK1
XRT7300
41
TTIP
40
TRING
44
MTIP
43
MRING
1 ^R3 2
270
1 ^R4 2
270
R1
1
2
36
1 ^T1 5
R2
1
2
36
4
8
1:1
TTIP
TRING
8
RTIP
9
RRING
C1
1
2
0.01uF
R5
37.5
R6
37.5
1 ^T2 5
4
8
1:1
RTIP
RRING
The "Transmit Section" of the XRT72L13 contains a
block which is known as the "Transmit DS3 LIU Inter-
face" block. The purpose of the "Transmit DS3 LIU
Interface" block is to take the "outbound" DS3 data
stream, from the "Transmit DS3 Framer" block, and to
do the following:
1. Encode this data into one of the following line
codes
a. Unipolar (e.g., Single-Rail)
b. AMI (Alternate Mark Inversion)
c. B3ZS (Bipolar 3 Zero Substitution)
2. And to transmit this data to the LIU IC.
Figure 85 presents a simple illustration of the "Trans-
mit DS3 LIU Interface" block.
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