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: 62/140页
文件大小: 1514K
代理商: WJLXT384LEB1
28
Document Number: 248994
Revision Number: 005
Revision Date: November 28, 2005
Intel LXT384 Octal T1/E1/J1 S/H PCM Transceiver with JA
5.3.2
Bipolar vs. Unipolar Operation - Transmit Side
Table 6 on page 22 lists transmit-side framer/mapper signals, which connect to a framer/mapper
using either bipolar or unipolar interface connections. Table 8 lists details.
TDATA - works in combination with BPV outputs, in unipolar mode.
TNEG - works in combination with TPOS, in bipolar mode.
Depending on the state of a UBS7:0 pin, both the corresponding receiver and transmitter pins are
automatically set for either bipolar I/O or unipolar I/O.
When a TNEG/UBS pin is connected low:
TNEG/TPOS/TCLK lines are active, and bipolar I/O is selected.
— A logic 1 on TNEG corresponds to the transmission of a negative pulse on TRING/TTIP.
— A logic 1 on TPOS corresponds to the transmission of a positive pulse on TRING/TTIP.
When a TNEG/UBS pin is connected high for more than 16 consecutive MCLK clock cycles:
TDATA/TCLK lines are active, and unipolar I/O is selected.
Polarity cannot be controlled on the TTIP/TRING outputs.
TCLK supplies the input synchronization for data transfer.
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