參數(shù)資料
型號(hào)： XRT73L03A
廠商： Exar Corporation
英文描述： 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
中文描述： 三通道DS3/E3/STS-1線路接口單元
文件頁數(shù)： 29/62頁
文件大小： 494K
代理商： XRT73L03A
XRT73L03A
3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
REV. 2.0.4
27
The default value for each of the bit-fields within these reg-
isters is "0".
a. Operating in the Hardware Mode.
In order to configure individual Channels into the ap-
propriate mode, set the E3_(n), and the STS-1/
DS3_(n) input pins (where n = 0, 1 or 2) to the appro-
priate logic states, as presented below inTable 3.
b. Operating in the HOST Mode.
To configure a Channel into the appropriate mode,
write the appropriate values into the STS-1/DS3_(n)
and E3_(n) bit-fields within the Command Register
CR4-(n), as illustrated below (refer to Table 2 for the
correct address for each channel).
COMMAND REGISTER, CR4-(n)
Table 4 relates the values of these two bit-fields to the
selected data rates.
T
ABLE
4: S
ELECTING
THE
D
ATA
R
ATE
FOR
C
HANNEL
(n)
VIA
THE
STS-1/DS3_(n)
AND
THE
E3_(n)
BIT
-
FIELDS
WITHIN
THE
A
PPROPRIATE
C
OMMAND
R
EGISTER
(HOST
M
ODE
)
2.0
Figure 13 indicates that the Transmit Section within
each Channel of the XRT73L03A consists of the fol-
lowing blocks:
Transmit Logic Block
THE TRANSMIT SECTION
TxClk_(n) Duty Cycle Adjust Block
HDB3/(B3ZS) Encoder
Pulse Shaping Block
The purpose of the Transmit Section is to take TTL/
CMOS level data from the terminal equipment and
encode it into a format such that it can:
1.
Be efficiently transmitted over coaxial cable at E3,
DS3, or STS-1 data rates.
2.
Be reliably received by the Remote Terminal
Equipment at the other end of the E3, DS3, or
STS-1 data link.
3.
Comply with the applicable pulse template
requirements.
2.1
T
HE
T
RANSMIT
L
OGIC
B
LOCK
The purpose of the Transmit Logic Block is to accept
either Dual-Rail or Single-Rail (e.g., a binary data
stream) TTL/CMOS level data and timing information
from the Terminal Equipment.
2.1.1
Accepting Dual-Rail Data from the Termi-
nal Equipment
Whenever the XRT73L03A accepts Dual-Rail data
from the Terminal Equipment, it does so via the fol-
lowing input signals:
TPData_(n)
TNData_(n)
TxClk_(n)
Figure 14 illustrates the typical interface for the trans-
mission of data in a Dual-Rail Format between the
Terminal Equipment and the Transmit Section of the
XRT73L03A.
T
ABLE
3: S
ELECTING
THE
D
ATA
R
ATE
FOR
C
HANNEL
(n)
VIA
THE
E3_(n)
AND
STS-1/DS3_(n)
INPUT
PINS
(H
ARDWARE
M
ODE
)
D
ATA
R
ATE
S
TATE
OF
E3_
(n)
P
IN
S
TATE
OF
STS-1/DS3_
(n)
P
IN
M
ODE
OF
B3ZS/HDB3 E
NCODER
/
D
ECODER
B
LOCKS
E3 (34.368 Mbps)
1
X (Don’t Care)
HDB3
DS3 (44.736 Mbps)
0
0
B3ZS
STS-1 (51.84 Mbps)
0
1
B3ZS
D4
D3
D2
D1
D0
X
STS-1/(DS3)_(n))
E3_(n)
LLB_(n) RLB_(n)
x
x
x
x
x
S
ELECTED
D
ATA
R
ATE
STS-1/DS3_
(n)
(D3)
E3_
(n)
(D2)
E3
X (Don’t Care)
1
DS3
0
0
STS-1
1
0
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XRT73L03AIV 制造商:Exar Corporation 功能描述:
XRT73L03B 制造商:EXAR 制造商全稱:EXAR 功能描述:3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
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XRT73L03BIV 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray
XRT73L03BIV-F 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray
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