參數(shù)資料
型號: XRT83SH314IB
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: 14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
中文描述: DATACOM, PCM TRANSCEIVER, PBGA304
封裝: 31 X 31 MM, 1.27 MM PITCH, PLASTIC, BGA-304
文件頁數(shù): 30/101頁
文件大小: 656K
代理商: XRT83SH314IB
XRT83SH314
26
14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.4
F
IGURE
17. T
RANSMIT
D
ATA
S
AMPLED
ON
R
ISING
E
DGE
OF
TCLK
N
OTE
:
VDD=3.3V ±5%, T
A
=25°C, Unless Otherwise Specified
3.2
HDB3/B8ZS Encoder
In single rail mode, the LIU can encode the TPOS input signal to AMI or HDB3/B8ZS data. In E1 mode and
HDB3 encoding selected, any sequence with four or more consecutive zeros in the input will be replaced with
000V or B00V, where "B" indicates a pulse conforming to the bipolar rule and "V" representing a pulse violating
the rule. An example of HDB3 encoding is shown in
Table 7
. In T1 mode and B8ZS encoding selected, an
input data sequence with eight or more consecutive zeros will be replaced using the B8ZS encoding rule. An
example with Bipolar with 8 Zero Substitution is shown in
Table 8
.
T
ABLE
6: T
IMING
S
PECIFICATIONS
FOR
TCLK/TPOS/TNEG
P
ARAMETER
S
YMBOL
M
IN
T
YP
M
AX
U
NITS
TCLK Duty Cycle
T
CDU
30
50
70
%
Transmit Data Setup Time
T
SU
50
-
-
ns
Transmit Data Hold Time
T
HO
30
-
-
ns
TCLK Rise Time (10% to 90%)
TCLK
R
-
-
40
ns
TCLK Fall Time (90% to 10%)
TCLK
F
-
-
40
ns
T
ABLE
7: E
XAMPLES
OF
HDB3 E
NCODING
N
UMBER
OF
P
ULSES
B
EFORE
N
EXT
4 Z
EROS
Input
0000
HDB3 (Case 1)
Odd
000V
HDB3 (Case 2)
Even
B00V
TCLK
TPOS
or
TNEG
TCLK
F
TCLK
R
T
HO
T
SU
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