- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄376461 > XRT7302 (Exar Corporation) 2 Channel E3/DS3/STS-1 Line Interface Unit(2通道 E3/DS3/STS-1線接口單元) PDF資料下載
參數(shù)資料
| 型號： | XRT7302 |
| 廠商： | Exar Corporation |
| 英文描述： | 2 Channel E3/DS3/STS-1 Line Interface Unit(2通道 E3/DS3/STS-1線接口單元) |
| 中文描述： | 2頻道E3/DS3/STS-1線路接口單元（2通道E3/DS3/STS-1線接口單元） |
| 文件頁數(shù)： | 29/62頁 |
| 文件大?。?/td> | 715K |
| 代理商： | XRT7302 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁當前第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁
á
PRELIMINARY
2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT7302
REV. 1.1.6
25
b. Operating in the HOST Mode.
To configure the Data Rate of a Channel, write the
appropriate values into the STS-1/DS3_Ch(n) and
E3_Ch(n) bit-fields in Command Register CR4-(n).
N
OTE
:
Reference Table 2 for the correct address of 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
)
OF
THE
XRT7302
VIA
THE
STS-1/DS3_C
H
(
N
)
AND
THE
E3_C
H
(
N
)
BIT
-
FIELDS
IN
THE
A
PPROPRIATE
C
OMMAND
R
EGISTER
(HOST M
ODE
)
Making these selections does the following:
Configure the VCO Center Frequency of Chan-
nel(n) of the Clock Recovery Phase-Locked Loop to
match the selected data rate.
If the DS3 or STS-1 data rates are selected, it con-
figures the B3ZS/(HDB3) Encoder and Decoder
blocks to support B3ZS Encoding/Decoding.
If the E3 data rate is selected, it configures the
B3ZS/(HDB3) Encoder and Decoder blocks to sup-
port HDB3 Encoding/Decoding.
Configure the on-chip Pulse-Shaping circuitry to
generate Transmit Output pulses of the appropriate
shape and width to meet the applicable pulse tem-
plate requirement.
Establishes the LOS Declaration/Clearance Criteria
for Channel(n) (Section 3.5).
2.0
THE TRANSMIT SECTION
Figure 6 shows the Transmit Section in each Channel
of the XRT7302 consists of the following blocks:
Transmit Logic Block
TxClk(n) Duty Cycle Adjust Block
HDB3/(B3ZS) Encoder
Pulse Shaping Block
The purpose of the Transmit Section in each Channel
of the XRT7302 is to take TTL/CMOS level data from
the Terminal Equipment and encode it into a format
that 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, and
3.
comply with the applicable pulse template
requirements.
The circuitry that the Transmit Section in each Chan-
nel of the XRT7302 takes to accomplish this goal is
discussed below.
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 (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 XRT7302 accepts Dual-Rail data from
the Terminal Equipment, it does so via the following
input signals:
TPData(n)
TNData(n)
TxClk(n)
Figure 7 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
XRT7302.
STS-1 (51.84 Mbps)
0
1
B3ZS
T
ABLE
3: S
ELECTING
THE
D
ATA
R
ATE
FOR
C
HANNEL
(
N
)
OF
THE
XRT7302,
VIA
THE
E3_C
H
(
N
)
AND
STS-1/
DS3_C
H
(
N
)
INPUT
PINS
(H
ARDWARE
M
ODE
)
D
ATA
R
ATE
S
TATE
OF
E3_C
H
(
N
) P
IN
(P
IN
20
OR
39)
S
TATE
OF
STS-1/DS3_CH(
N
)
P
IN
(P
IN
21
OR
41)
M
ODE
OF
B3ZS/HDB3 E
NCODER
/
D
ECODER
B
LOCKS
D4
D3
D2
D1
D0
X
STS-1/(DS3)_(n))
E3_Ch(n)
LLB(n)
RLB(n)
X
X
X
X
Xs
S
ELECTED
D
ATA
R
ATE
STS-1/DS3_C
H
(
N
)
(D3)
E3_C
H
(
N
)
(D2)
E3
X (Don't Care)
1
DS3
0
0
STS-1
1
0
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XRT73L02M | TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT73L02MIV | TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT73L02 | 2 Channel E3/DS3/STS-1 Line Interface Unit(2通道 E3/DS3/STS-1線接口單元) |
| XRT73L03A | 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT |
| XRT73L03AIV | 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XRT7302IV | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PCM Transceiver |
| XRT73L00 | 制造商:EXAR 制造商全稱:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT73L00A | 制造商:EXAR 制造商全稱:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT |
| XRT73L00AES | 功能描述:界面開發(fā)工具 Eval System for XRT73L00A Series RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| XRT73L00AIV | 制造商:EXAR 制造商全稱:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT |
發(fā)布緊急采購，3分鐘左右您將得到回復。