参数资料
型号: IDT82V3355TFG
厂商: IDT, Integrated Device Technology Inc
文件页数: 57/135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
28
May 19, 2009
3.9
SELECTED INPUT CLOCK STATUS VS. DPLL
OPERATING MODE
The operating modes supported by T0 DPLL are more complex than
the ones supported by T4 DPLL for T0 path is the main one. T0 DPLL
supports three primary operating modes: Free-Run, Locked and Hold-
over, and three secondary, temporary operating modes: Pre-Locked,
Pre-Locked2 and Lost-Phase. T4 DPLL supports three operating
modes: Free-Run, Locked and Holdover. The operating modes of T0
DPLL and T4 DPLL can be switched automatically or by force, as con-
trolled by the T0_OPERATING_MODE[2:0] / T4_OPERATING_
MODE[2:0] bits respectively.
When the operating mode is switched by force, the operating mode
switch is under external control and the status of the selected input clock
takes no effect to the operating mode selection. The forced operating
mode switch is applicable for special cases, such as testing.
When the operating mode is switched automatically, the internal
state machines for T0 and for T4 automatically determine the operating
mode respectively.
3.9.1
T0 SELECTED INPUT CLOCK VS. DPLL OPERATING
MODE
The T0 DPLL operating mode is controlled by the
T0_OPERATING_MODE[2:0] bits, as shown in Table 16:
When the operating mode is switched automatically, the operation of
the internal state machine is shown in Figure 6.
Whether the operating mode is under external control or is switched
automatically, the current operating mode is always indicated by the
T0_DPLL_OPERATING_MODE[2:0] bits. When the operating mode
switches, the T0_OPERATING_MODE 1 bit will be set. If the
T0_OPERATING_MODE 2 bit is ‘1’, an interrupt will be generated.
Table 16: T0 DPLL Operating Mode Control
T0_OPERATING_MODE[2:0]
T0 DPLL Operating Mode
000
Automatic
001
Forced - Free-Run
010
Forced - Holdover
100
Forced - Locked
101
Forced - Pre-Locked2
110
Forced - Pre-Locked
111
Forced - Lost-Phase
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