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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)： | 56/62頁 |
| 文件大?。?/td> | 715K |
| 代理商： | XRT7302 |
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XRT7302
2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
á
PRELIMINARY
REV. P1.1.6
52
If the cable length is greater than 225 feet, set this bit-
field to "1" in order to increase the amplitude of the
Transmit Output Signal. If the cable length is less
than 225 feet, set this bit-field to "0".
N
OTE
:
This option is only available when the XRT7302 is
operating in the DS3 or STS-1 Mode.
Bit D0 - TxBIN(n) (Transmit Binary Data - Chan-
nel(n))
This Read/Write bit-field is used to configure the
Channel(n) Transmitter to accept an un-encoded bi-
nary data stream via the TPData input and convert
this data into the appropriate bipolar signal for the
line.
Writing a "1" configures the Transmitter to accept a bi-
nary data stream via the TPData input. The TNData
input is ignored.
This form of data acceptance is sometimes referred
to as Single-Rail mode operation. The Transmitter
then encodes this data into the appropriate line code
(e.g., B3ZS or HDB3) prior to its transmission over
the line.
Writing a "0" configures the Transmitter to accept da-
ta in a Dual-Rail manner via TPData and TNData in-
puts.
5.2.3
Command Register CR2-(n)
The bit-format and default values for Command Reg-
ister CR2-(n) are listed below followed by the function
of each of these bit-fields.
COMMAND REGISTER CR2-(N)
Bit D4 - Reserved
Bit D3 - ENDECDIS (B3ZS/HDB3 Encoder/Decod-
er-Disable - Channel(n))
This Read/Write bit-field is used to enable or disable
the Channel(n) B3ZS/HDB3 Encoder and Decoder
blocks.
Writing a "1" to this bit-field disables the B3ZS/HDB3
Encoder and Decoder blocks. Writing a "0" to this bit-
field enables the B3ZS/HDB3 Encoder and Decoder
blocks.
N
OTE
:
This Encoder/Decoder performs HDB3 Encoding/
Decoding if the XRT7302 is operating in the E3 Mode. Oth-
erwise, it performs B3ZS Encoding/Decoding.
Bit D2 - ALOSDIS (Analog LOS Disable - Chan-
nel(n))
This Read/Write bit-field is used to enable or disable
the Channel(n) Analog LOS Detector.
Writing a "0" to this bit-field enables the Analog LOS
Detector. Writing a "1" to this bit-field disables the
Analog LOS Detector.
N
OTE
:
If the Analog LOS Detector is disabled, then the
RLOS input pin is only asserted by the DLOS (Digital LOS
Detector).
Bit D1 - DLOSDIS (Digital LOS Disable - Chan-
nel(n))
This Read/Write bit-field to used to enable or disable
the Channel(n) Digital LOS Detector .
Writing a "0" to this bit-field enables the Digital LOS
Detector. Writing a "1" to this bit-field disables the
Digital LOS Detector.
N
OTE
:
If the Digital LOS Detector is disabled, then the
RLOS input pin is only asserted by the ALOS (Analog LOS
Detector).
Bit D0 - REQEN (Receive Equalization Enable -
Channel(n))
This Read/Write bit-field is used to either enable or
disable the Channel(n) internal Receive Equalizer of
the XRT7302.
Writing a "1" to this bit-field enables the Internal
Equalizer. Writing a "0" to this bit-field disables the
Internal Equalizer.
5.2.4
Command Register CR3-(n)
The bit-format and default values for Command Reg-
ister CR3 are listed below followed by the function of
these bit-fields.
COMMAND REGISTER CR3-(N)
Bit D4 - SR/DR_(n)(Single-Rail/Dual-Rail Data Out-
put - Channel(n))
This Read/Write bit-field is used to configure Chan-
nel(n) in the XRT7302 to output the received data
from the Remote Terminal in a binary or Dual-Rail for-
mat.
Writing a "1" to this bit-field configures Channel(n) to
output data to the Terminal Equipment in a binary
Single-Rail format via the RPOS(n) output pin.
RNEG(n) is grounded. Writing a "0" to this bit-field
configures Channel(n) to output data to the Terminal
Equipment in a Dual-Rail format via both the
RPOS(n) and RNEG(n) output pins.
D4
D3
D2
D1
D0
Reserved ENDECDIS ALOSDIS
DLOSDIS
REQEN
X
0
0
0
0
D4
D3
D2
D1
D0
SR/DR_(n) LOSMUT(n) RxOFF(n) RxClk(n)INV Reserved
0
1
0
0
0
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