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| 型号： | WJLXT388LEB2 |
| 厂商： | CORTINA SYSTEMS INC |
| 元件分类： | 数字传输电路 |
| 英文描述： | DATACOM, PCM TRANSCEIVER, PQFP100 |
| 封装： | 14 X 14MM, ROHS COMPLIANT, LQFP-100 |
| 文件页数： | 5/80页 |
| 文件大小： | 1017K |
| 代理商： | WJLXT388LEB2 |
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Dual T1/E1/J1 Transceiver — Intel
LXT388
Datasheet
13
23
RPOS0/
RDATA0
DO
Receive Positive.
Receive Data.
Receive Negative Data.
Bipolar Violation Detect.
Bipolar Mode:
In clock recovery mode these pins act as active high bipolar non return to zero (NRZ)
receive signal outputs. A High signal on RPOS corresponds to receipt of a positive pulse
on RTIP/RRING. A High signal on RNEG corresponds to receipt of a negative pulse on
RTIP/RRING. These signals are valid on the falling or rising edges of RCLK depending on
the CLKE input.
In Data recovery Mode these pins act as RZ data receiver outputs. The output polarity is
selectable with CLKE (Active High output polarity when CLKE is High and Active Low
Polarity when CLKE is Low).
RPOS and RNEG will go to the high impedance state when the MCLK pin is Low.
Unipolar Mode:
In uni-polar mode, the LXT388 asserts BPV High if any in-service Line Code Violation is
detected. RDATA acts as the receive data output.
Hardware Mode: During a LOS condition, RPOS and RNEG will remain active.
Host Mode: RPOS and RNEG will either remain active or insert AIS into the receive path.
Selection is determined by the RAISEN bit in the GCR register.
24
RNEG0/
BPV0
DO
25
LOS0
DO
Loss of Signal. LOS goes High to indicate a loss of signal, i.e. when the incoming signal has
no transitions for a specified time interval. The LOS condition is cleared and the output pin
returns to Low when the incoming signal has sufficient number of transitions in a specified time
interval. see “Loss of Signal Detector” on page 22
51
LOS3
D
DO
Loss of Signal.
52
RNEG3/
BPV3
DO
Receive Negative Data.
Bipolar Violation Detect.
53
RPOS3/
RDATA3
DO
Receive Positive Data.
Receive Data.
54
RCLK3
DO
Receive Clock.
55
TNEG3/
UBS3
DI
Transmit Negative Data.
Unipolar/Bipolar Select.
56
TPOS3/
TDATA3
DI
Transmit Positive Data.
Transmit Data.
57
TCLK3
DI
Transmit Clock.
58
LOS2
DO
Loss of Signal.
59
RNEG2/
BPV2
DO
Receive Negative Data.
Bipolar Violation Detect.
60
RPOS2/
RDATA2
DO
Receive Positive Data.
Receive Data.
61
RCLK2
DO
Receive Clock.
62
TNEG2/
UBS2
DI
Transmit Negative Data.
Unipolar/Bipolar Select.
Table 2.
Pin Assignments and Signal Descriptions - Digital Interface (Continued)
Pin #
LQFP
Symbol
I/O
1
Description
1. DI: Digital Input; DO: Digital Output; DI/O: Digital Bidirectional Port; AI: Analog Input; AO: Analog Output S: Power Supply;
N.C.: Not Connected.
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