參數(shù)資料
型號(hào): XRT83VSH314
廠商: Exar Corporation
英文描述: 14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
中文描述: 14-CHANNEL的T1/E1/J1短途線路接口單元
文件頁(yè)數(shù): 19/80頁(yè)
文件大?。?/td> 497K
代理商: XRT83VSH314
XRT83VSH314
16
REV. 1.0.1
14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
2.0
CLOCK SYNTHESIZER
In system design, fewer clocks on the network card could reduce noise and interference. Network cards that
support both T1 and E1 modes must be able to produce 1.544MHz and 2.048MHz transmission data. The
XRT83VSH314 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
.
F
IGURE
2. S
IMPLIFIED
B
LOCK
D
IAGRAM
OF
THE
C
LOCK
S
YNTHESIZER
T
ABLE
1: I
NPUT
C
LOCK
S
OURCE
S
ELECT
CLKSEL[3:0]
I
NPUT
C
LOCK
R
EFERENCE
0h (0000)
2.048 MHz
1h (0001)
1.544MHz
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
Clock
Synthesizer
Internal
Reference
1.544MHz
2.048MHz
Input Clock
8kHz
1.544Mhz
2.048MHz
2.048/4.096/8.192/16.384 MHz
1.544/3.088/6.176/12.352MHz
8kHzOUT
MCLKE1out
MCLKT1out
MCLKT1Nout
MCLKE1Nout
Programmable
Programmable
相關(guān)PDF資料
PDF描述
XRT83VSH314IB 14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
XRT83VSH316 16-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
XRT83VSH316IB 16-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
XRT83VSH38 8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
XRT83VSH38IB 8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
相關(guān)代理商/技術(shù)參數(shù)
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