参数资料
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: 39/80页
文件大小: 1017K
代理商: WJLXT388LEB2
Intel
LXT388 — Dual T1/E1/J1 Transceiver
44
Datasheet
4CODEN
This bit selects the zero suppression code for unipolar operation mode:
0 = B8ZS/HDB3 (T1/E1 respectively)
1 = AMI
5CDIS
This bit controls enables/disables the short circuit protection feature:
0 = enabled
1 = disabled
6
RAISEN
This bit controls automatic AIS insertion in the receive path when LOS occurs:
0 = Receive AIS insertion disabled on LOS
1 = RPOS/RNEG = AIS on LOS
Note: this feature is not available in data recovery mode (MCLK=High). Disable AIS
interrupts when changing this bit value to prevent inadvertent interrupts.
7-
Reserved.
Table 28. Pulse Shaping Indirect Address Register, PSIAD (10H)
Bit
1
Name
Function
0-2
LENAD 0-2
The three bit value written to these bits determine the channel to be addressed:
0H = channel 0
1H = channel 1
2H = receiver 2
3H = receiver 3
Data can be read from (written to) the Pulse Shaping Data Register (PSDAT).
3 - 7
-
Reserved.
1. On power-on reset the register is set to “0”.
Table 29. Pulse Shaping Data Register, PSDAT (11H)
Bit
Name
Function
0-2
LEN 0-2 1,3
LEN0-2 determine the LXT388 operation mode (T1 or E1) in all the receivers. In addition,
for T1 operation, LEN2-0 set transmit pulse shaping in order to meet T1.102 pulse
template at the DSX-1 cross-connect point for various cable lengths.
LEN2
LEN1
LEN0
Line Length
Cable Loss
2
Operation
Mode
0
1
0
1
0
1
0
1
0 - 133 ft. ABAM
133 - 266 ft. ABAM
266 - 399 ft. ABAM
399 - 533 ft. ABAM
533 - 655 ft. ABAM
0.6 dB
1.2 dB
1.8 dB
2.4 dB
3.0 dB
T1
0
E1 G.703, 75
Ω coaxial cable and 120 Ω
twisted pair cable.
E1
3 - 7
-
Reserved.
1. On power-on reset the register is set to “0”.
2. Maximum cable loss at 772 KHz.
3. When reading LEN, bit values appear inverted. “B1” revision silicon will fix this so the bits read back correctly.
Table 27. Global Control Register, GCR (0FH) (Continued)
Bit1
Name
Function
1. On power-on reset the register is set to “0”.
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