XRT72L54 Datasheet, PDF (321/484 Pages) Exar Corporation – FOUR CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER

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PRELIMINARY
XRT72L54
FOUR CHANNEL DS3/E3 FRAMER IC WITH HDLC CONTROLLER
REV. P1.1.2
FIGURE 130. ILLUSTRATION ON HOW A CHANNEL OF THE RECEIVE E3 FRAMER (WITHIN THE XRT72L54 FRAMER
IC) BEING INTERFACE TO THEXRT73L04 LINE INTERFACE UNIT, WHILE OPERATING IN BIPOLAR MODE
RxAIS_Ch_0
RxRED_ALARM_0
Rx_OOF_Ch_0
Rx_LOS_Ch_0
RxFRAME_0
RxSERIAL_CLK_0
RxDATA_IN_0
D[7:0]
A[10:0]
READY_OUT*
ALE
RD*
WR*
XRT72L54_CS*
XRT72L54_INT*
HW_RESET*
TxFRAME_0
44.736MHz
TxDATA_OUT_0
RxAVDD_0
DVDD_0
U1
C5
B5
A3
C4
RxAIS_0
RxRED_0
RxOOF_0
RxLOS_0
F20
D20
F19
T20
RxFrame_0
RxClk_0
RxSer_0
MOTO
RxPOS_0 ^F2
RxNEG_0 ^F3
J19
J20
K17
K18
K19
K20
L20
L18
D7
D6
D5
D4
D3
D2
D1
D0
M20
M19
M18
M17
N20
N19
N18
P20
P19
P18
R20
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
J17
R19
V20
P17
R18
H20
Rdy_Dtck
ALE_AS
RDB_DS
WRB_RW
CSB
INT
T19 _RESETB
RxLineClk_0 ^F1
RLOL_0
ExtLOS_0
B8
D9
LLOOP_0
REQB_0
TAOS_0
DMO_0
TxLEV_0
C7
A5
C6
C9
C3
RLOOP_0 ^B7
ENCODIS_0 (TxOFF_0)
B2
TxPOS_0 ^C1
TxNEG_0 ^D1
TxLineClk_0 ^E2
T18 _NIBBLEINTF
E20
G4
E18
TxFrame_0
TxInClk_0
TxSER_0
XRT72L54_Ch_0
C2
0.01uF
C3
0.01uF
R7
4.7k
78 _RxAVDD0
58 _RxDVDD0
75
52
LOSTHR_0
HOST/HW
61 _RPOS0
60 _RNEG0/LCV0
59 _RCLK0
U2
TxAVDD0 ⁴⁷
TxAVDD0 ³³
RTIP0 ⁸⁰
RRING0 ⁷⁹
XRT71D04_CS* (Optional)
65
64
RLOL_0
RLOS_0
69
70
71
72
110
CS
SCLK
SDI
SDO
REG_RESET*
131 _TxOFF
41 _{TPDATA_0}
40 _{TNDATA_0}
42
66
TCLK_0
EXCLK_0
TTIP0 ³⁴
TRING0 ³²
MTIP0 ³⁵
54 _RxDGND0
73 _RxAGND0
MRING0 ³⁶
TxAGND0 ³¹
TxAGND0 ⁴⁹
XRT73L04IV_Ch_0
C5
0.01uF
TxAVDD_0
C4
0.01uF
R1
R2
37.4
37.4
C1
0.01uF
6 _T2 1
43
T3001
R3
1 _T1 6
31.6
R4
34
T3001
R5
31.6
270
R6
270
J1
BNC
1
J2
BNC
1
5.3.1.2.1 AMI Decoding
AMI or Alternate Mark Inversion, means that consec-
utive "one's" pulses (or marks) will be of opposite po-
larity with respect to each other. This line code in-
volves the use of three different amplitude levels: +1,
0, and -1. The +1 and -1 amplitude signals are used
to represent one's (or mark) pulses and the "0" ampli-
tude pulses (or the absence of a pulse) are used to
represent zeros (or space) pulses. The general rule
for AMI is: if a given mark pulse is of positive polarity,
then the very next mark pulse will be of negative po-
larity and vice versa. This alternating-polarity rela-
tionship exists between two consecutive mark pulses,
independent of the number of zeros that exist be-
tween these two pulses. Figure 131 presents an illus-
tration of the AMI Line Code as would appear at the
RxPOS and RxNEG pins of the Framer, as well as the
output signal on the line.
302