参数资料
型号: IDT82P2828BHG
厂商: IDT, Integrated Device Technology Inc
文件页数: 113/154页
文件大小: 0K
描述: IC LIU T1/J1/E1 28+1CH 640-PBGA
标准包装: 5
类型: 线路接口装置(LIU)
规程: E1
电源电压: 3.13 V ~ 3.47 V
安装类型: 表面贴装
封装/外壳: 640-BGA 裸露焊盘
供应商设备封装: 640-PBGA-EP(31x31)
包装: 托盘
其它名称: 82P2828BHG
IDT82P2828
28(+1) CHANNEL HIGH-DENSITY T1/E1/J1 LINE INTERFACE UNIT
Functional Description
61
February 6, 2009
3.6
CLOCK INPUTS AND OUTPUTS
The IDT82P2828 provides two kinds of clock outputs:
Free running clock outputs on CLKT1 and CLKE1
Receiver clock outputs on REFA and REFB
- selected from any of the 29 recovered line clocks
- driven by MCLK (free running)
- driven by external CLKA/CLKB input
A Frequency Synthesizer is also available to scale REFA to 8
different frequencies.
The following Clock Inputs are provided:
MCLK as programmable reference timing for the IDT82P2828.
CLKA and CLKB as optional input clock source for REFA and
REFB respectively
3.6.1
FREE RUNNING CLOCK OUTPUTS ON CLKT1/CLKE1
An internal clock generator uses MCLK as reference to generate all
the clocks required by internal circuits and CLKT1/CLKE1 outputs.
MCLK should be a clock with +/-32 ppm (in T1/J1 mode) or +/-50 ppm
(in E1 mode) accuracy. The clock frequency of MCLK is 1.544/2.048 X N
MHz (1
≤ N ≤ 8, N is an integer number), as determined by
MCKSEL[3:0]. Refer to Chapter 2 Pin Description for details.
The outputs on CLKT1 and CLKE1 are free running (locking to
MCLK). The output of CLKT1 is determined by the CLKT1_EN bit (b1,
CLKG) and the CLKT1 bit (b0, CLKG). Refer to Table-23. The output of
CLKE1 is determined by the CLKE1_EN bit (b3, CLKG) and the CLKE1
bit (b2, CLKG). Refer to Table-24.
Table-23 Clock Output on CLKT1
Control Bits
Clock Output On CLKT1
CLKT1_EN
CLKT1
0
(don’t-care)
High-Z
1
08 KHz
1
1.544 KHz
Table-24 Clock Output on CLKE1
Control Bits
Clock Output On CLKE1
CLKE1_EN
CLKE1
0
(don’t-care)
High-Z
1
08 KHz
1
2.048 KHz
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