参数资料
型号: IDT82V3355TFG
厂商: IDT, Integrated Device Technology Inc
文件页数: 51/135页
文件大小: 0K
描述: IC PLL WAN SYNC ETH 64-TQFP
标准包装: 1
类型: 时钟/频率发生器,多路复用器
PLL:
主要目的: 以太网,SONET/SDH,Stratum
输入: CMOS,LVDS,PECL
输出: CMOS,LVDS,PECL
电路数: 1
比率 - 输入:输出: 3:2
差分 - 输入:输出: 是/是
频率 - 最大: 622.08MHz
电源电压: 3 V ~ 3.6 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 64-LQFP
供应商设备封装: 64-TQFP(10x10)
包装: 托盘
其它名称: 82V3355TFG
IDT82V3355
SYNCHRONOUS ETHERNET WAN PLL
Functional Description
22
May 19, 2009
3.6
T0 / T4 DPLL INPUT CLOCK SELECTION
An input clock is selected for T0 DPLL and for T4 DPLL respectively.
For T0 path, the EXT_SW bit and the T0_INPUT_SEL[3:0] bits deter-
mine the input clock selection, as shown in Table 6:
For T4 path, the T4 DPLL may lock to a T0 DPLL output or lock inde-
pendently from T0 path, as determined by the T4_LOCK_T0 bit. When
the T4 DPLL locks to the T0 DPLL output, the T4 selected input clock is
a 77.76 MHz or 8 kHz signal from the T0 DPLL 77.76 MHz path (refer to
Chapter 3.11.5.1 T0 Path), as determined by the T0_FOR_T4 bit. When
the T4 path locks independently from the T0 path, the T4 DPLL input
clock selection is determined by the T4_INPUT_SEL[3:0] bits. Refer to
External Fast selection is done between IN1_CMOS/IN1_DIFF and
IN2_CMOS/IN2_DIFF pairs.
Forced selection is done by setting the related registers.
Automatic selection is done based on the results of input clocks qual-
ity monitoring and the related registers configuration.
The selected input clock is attempted to be locked in T0/T4 DPLL.
3.6.1
EXTERNAL FAST SELECTION (T0 ONLY)
The External Fast selection is supported by T0 path only. In External
Fast selection, only IN1_CMOS/IN1_DIFF and IN2_CMOS/IN2_DIFF
pairs are available for selection. Refer to Figure 5. The results of input
clocks quality monitoring (refer to Chapter 3.5 Input Clock Quality Moni-
toring) do not affect input clock selection.
The T0 input clock selection is determined by the FF_SRCSW pin
after reset (this pin determines the default value of the EXT_SW bit dur-
ing
reset,
refer
to
the
IN1_CMOS_SEL_PRIORITY[3:0]
bits
and
the
IN2_CMOS_SEL_PRIORITY[3:0] bits, as shown in Figure 5 and
Figure 5. External Fast Selection
Table 6: Input Clock Selection for T0 Path
Control Bits
Input Clock Selection
EXT_SW
T0_INPUT_SEL[3:0]
1
don’t-care
External Fast selection
0
other than 0000
Forced selection
0000
Automatic selection
Table 7: Input Clock Selection for T4 Path
Control Bits - T4_INPUT_SEL[3:0]
Input Clock Selection
other than 0000
Forced selection
0000
Automatic selection
FF_SRCSW pin
IN1_CMOS
IN1_DIFF
IN2_CMOS
IN2_DIFF
IN1_CMOS_SEL_PRIORITY[3:0] bits
IN2_CMOS_SEL_PRIORITY[3:0] bits
attempted to be
locked in T0 DPLL
Table 8: External Fast Selection
Control Pin & Bits
the Selected Input Clock
FF_SRCSW (after reset)
IN1_CMOS_SEL_PRIORITY[3:0]
IN2_CMOS_SEL_PRIORITY[3:0]
high
0000
don’t-care
IN1_DIFF
other than 0000
IN1_CMOS
low
don’t-care
0000
IN2_DIFF
other than 0000
IN2_CMOS
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