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参数资料
| 型号： | WJLXT384LEB1 |
| 厂商： | CORTINA SYSTEMS INC |
| 元件分类： | 数字传输电路 |
| 英文描述： | DATACOM, PCM TRANSCEIVER, PQFP144 |
| 封装： | 20 X 20MM, ROHS COMPLIANT, LQFP-144 |
| 文件页数： | 88/140页 |
| 文件大小： | 1514K |
| 代理商： | WJLXT384LEB1 |
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51
Document Number: 248994
Revision Number: 005
Revision Date: November 28, 2005
Intel LXT384 Octal T1/E1/J1 S/H PCM Transceiver with JA
When an LOS condition is detected and the RAISEN bit setting is:
‘0’, AIS insertion into the receive path is disabled. In this case, there is no effect on the AIS
Status Monitor register.
‘1’, AIS insertion into the receive path is enabled. In this case, when the signals to the RTIP
and RRING inputs to a receiver are:
— All zeroes, the receiver generates all ones on the RPOS and RNEG outputs, and the AIS
Status Monitor register sets to ‘1’.
— All ones, the receiver generates all ones on the RPOS and RNEG outputs, and the AIS
Status Monitor register clears to ‘0’.
To prevent inadvertent interrupts during programming, before setting or resetting RAISEN, mask
the AIS interrupt enable bit for the corresponding receiver. (See Table 48, “AIS Interrupt Enable
6.3.7
Receiver In-Service Line-Code-Violation Monitoring
Receiver in-service line-code-violation monitoring occurs only with unipolar I/O (that is, when
TNEG/UBS is connected high for more than 16 consecutive MCLK cycles). In this case, when the
LXT384 Transceiver is receiving a line input signal and an in-service line-code violation occurs,
how this violation is reported depends on the type of decoder selected.
If the LOS Detector circuit (see Section 6.3.3, “Receiver Loss-Of-Signal Detector”) detects an in-
service line-code violation and the LXT384 Transceiver decoder type is:
AMI, all bipolar violations (two consecutive pulses with the same polarity) are reported at the
BPV output.
HDB3, the following occurs:
— First, the LXT384 Transceiver asserts the BPV pin high for one RCLK period for every
bipolar violation that is not part of the zero-code substitution rules.
— Next, the RDATA pin acts as the receive data output. (For details on the BPV and RDATA
pin functions, see Section 5.3, “Framer/Mapper Signals”.)
B8ZS, the following occurs:
— The LXT384 Transceiver reports bipolar violations on BPV for one RCLK period, for
every B8ZS violation that is not part of the zero code substitution rules.
— Bipolar 8-zero substitution is an encoding method used on T1 circuits that inserts two
successive ones of the same voltage—referred to as a bipolar violation—into a signal
whenever eight consecutive zeros are transmitted. The device receiving the signal
interprets the bipolar violation as a timing mark, which keeps the transmitting and
receiving devices synchronized. Ordinarily, when successive ones are transmitted, one has
a positive voltage and the other has a negative voltage.
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