參數(shù)資料
型號: XRT73L04AIV
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: 4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
中文描述: DATACOM, PCM TRANSCEIVER, PQFP144
封裝: 20 X 20 MM, 1.40 MM HEIGHT, HEAT SINK, TQFP-144
文件頁數(shù): 56/65頁
文件大?。?/td> 366K
代理商: XRT73L04AIV
XRT73L04A
4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
REV. 2.0.3
52
When the Transmit Drive Monitor circuitry within a
given line is connected to the line, as illustrated in
Figure 37, then it monitors the line for transitions. As
long as the Transmit Drive Monitor circuitry detects
transitions on the line via the MTIP_(n) and
MRing_(n) pins, then it keeps the DMO (Drive Monitor
Output) signal "Low". If the Transmit Drive Monitor
circuit detects no transitions on the line for 128+32
TxClk periods, then the DMO (Drive Monitor Output)
signal toggles "High".
N
OTE
:
The Transmit Drive Monitor circuit does not have to
be used to operate the Transmit Section of the XRT73L04A.
This is purely a diagnostic feature.
4.6
T
HE
TAOS (T
RANSMIT
A
LL
O
NE
S) F
EATURE
The XRT73L04A can command any channel to trans-
mit an all “1’s" pattern onto the line by toggling a sin-
gle input pin or by setting a single bit-field within one
of the Command Registers to "1".
N
OTE
:
When this feature is activated, the Transmit Section
of the configured channel overwrites the Terminal Equip-
ment data with this all “1’s" pattern.
a. Operating in the Hardware Mode
Configure Channel(n) to transmit an all “1’s" pattern
by toggling the TAOS_(n) input pin (pin 45, 46, 135 or
136) “High". Terminate the all “1’s" pattern by tog-
gling the TAOS_(n) input pin “Low".
b. Operating in the HOST Mode
Configure Channel(n) to transmit an all “1’s" pattern
by writing to Command Register CR1-(n) and setting
the TAOS_(n) bit-field (bit D3) to "1".
COMMAND REGISTER CR1-(n)
Terminate the all “1’s" pattern by writing to Command
Register CR1-(n) and setting the TAOS_(n) bit-field
(D3) to "0".
5.0
THE MICROPROCESSOR SERIAL INTER-
FACE
The on-chip Command Registers of XRT73L04A
DS3/E3/STS-1 Line Interface Unit IC are used to con-
figure the XRT73L04A into a wide-variety of modes.
This section discusses the following:
1. The description of the Command Registers.
2. A description on how to use the Microprocessor
Serial Interface.
5.1
D
ESCRIPTION
OF
THE
C
OMMAND
R
EGISTERS
(repeated as Table 7), lists the Command Registers,
their Addresses and their bit-formats.
F
IGURE
37. T
HE
XRT73L04A
EMPLOYING
THE
T
RANSMIT
D
RIVE
M
ONITOR
F
EATURES
R1 = 31.6
R2 = 31.6
Channel (n)
TxPOS_(n)
TxNEG_(n)
TxLineClk_(n)
TTIP_(n)
TRing_(n)
TPData_(n)
TNData_(n)
TxClk_(n)
Only One Channel Shown
1:1
J1
BNC
MTIP_(n)
MRing_(n)
R3 = 270
R4 = 270
D4
D3
D2
D1
D0
TxOFF_(n) TAOS_(n) TxClkINV_(n) TxLEV_(n) Reserved
0
1
X
X
X
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