参数资料
型号: XRT83SL314IB-L
厂商: Exar Corporation
文件页数: 9/83页
文件大小: 0K
描述: IC LIU SH T1/E1/J1 14CH 304TBGA
标准包装: 27
类型: 线路接口装置(LIU)
驱动器/接收器数: 14/14
规程: T1,E1,J1
电源电压: 3.135 V ~ 3.465 V
安装类型: 表面贴装
封装/外壳: 304-LBGA
供应商设备封装: 304-TBGA(31x31)
包装: 托盘
xr
XRT83SL314
14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.1
14
1.0
CLOCK SYNTHESIZER
In system design, fewer clocks on the network card could reduce noise and interference. Common clock
references such as 8kHz are readily available to network designers. Network cards that support both T1 and
E1 modes must be able to produce 1.544MHz and 2.048MHz transmission data. The XRT83SL314 has a built
in clock synthesizer that requires only one input clock reference by programming CLKSEL[3:0] in the
appropriate global register. A list of the input clock options is shown in Table 1.
The single input clock reference is used to generate multiple timing references. The first objective of the clock
synthesizer is to generate 1.544MHz and 2.048MHz for each of the 14 channels. This allows each channel to
operate in either T1 or E1 mode independent from the other channels. The state of the equalizer control bits in
the appropriate channel registers determine whether the LIU operates in T1 or E1 mode. The second objective
is to generate additional output clock references for system use. The available output clock references are
shown in Figure 2.
TABLE 1: INPUT CLOCK SOURCE SELECT
CLKSEL[3:0]
INPUT CLOCK REFERENCE
0h (0000)
2.048 MHz
1h (0001)
1.544MHz
2h (0010)
8 kHz
3h (0011)
16 kHz
4h (0100)
56 kHz
5h (0101)
64 kHz
6h (0110)
128 kHz
7h (0111)
256 kHz
8h (1000)
4.096 MHz
9h (1001)
3.088 MHz
Ah (1010)
8.192 MHz
Bh (1011)
6.176 MHz
Ch (1100)
16.384 MHz
Dh (1101)
12.352 MHz
Eh (1110)
2.048 MHz
Fh (1111)
1.544 MHz
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