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: 91/140页
文件大小: 1514K
代理商: WJLXT384LEB1
54
Document Number: 248994
Revision Number: 005
Revision Date: November 28, 2005
Intel LXT384 Octal T1/E1/J1 S/H PCM Transceiver with JA
In the Hardware mode, if TCLK is connected high 16 consecutive MCLK clock cycles and MCLK
is:
Not supplied (or ‘low’), the transmit pulse-shaper circuit shown in Figure 1 is bypassed (that
is, disabled). In this case, TPOS and TNEG control the pulse width and polarity on TTIP and
TRING.
Supplied, the driver enters into a special mode known as Transmit All Ones, or ‘TAOS’. For
more information on the TAOS mode, see Section 6.8, “Transmit All Ones Operations” and
Caution:
When the pulse-shaping circuit is disabled, it is possible to overheat and damage the LXT384
Transceiver by leaving transmit inputs connected high continuously. For example, if a
programmable ASIC is used in a system that uses the LXT384 Transceiver, the ASIC outputs
might be left high until the ASIC is fully programmed. To prevent damage to the LXT384
Transceiver, use either one of the following practices:
Apply a clock to one of these signals: TPOS, TNEG, TCLK, or MCLK.
Set one of these signals low: TPOS, TNEG, TCLK, or OE.
6.4.2.1
LXT384 Transceiver Hardware Mode
In hardware mode, pins LEN0-2 of the LXT384 Transceiver determine the pulse shaping as
described in Table 20. The LEN settings also determine whether the operating mode is T1 or E1.
Note:
In hardware mode, all eight ports will share the same pulse shaping setting. Independent pulse
shaping for each channel is available in host mode.
6.4.2.2
LXT384 Transceiver Host Mode
In Host Mode, the contents of the Pulse Shaping Data Register (PSDAT) on the LXT384
Transceiver determines the shape of pulse output at TTIP/TRING. Refer to Table 44 and Table 45.
Table 20. Line Length Equalizer Inputs
LEN2
LEN1
LEN0
Line Length1
Cable Loss2
Operation Mode
011
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
100
101
110
111
000
E1 G.703, 75
Ω coaxial cable and 120 Ω twisted pair
cable.
E1
1. Line length from LXT384 Transceiver to DSX-1 cross-connect point.
2. Maximum cable loss at 772KHz.
相关PDF资料
PDF描述
WJLXT385LEB1 DATACOM, PCM TRANSCEIVER, PQFP144
WJLXT385LEB1 DATACOM, PCM TRANSCEIVER, PQFP144
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