参数资料
型号: IDT82V3355TFG
厂商: IDT, Integrated Device Technology Inc
文件页数: 60/135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
30
May 19, 2009
The causes of Item 4, 9, 12, 15 - ‘the T0 selected input clock is
switched to another one’ - are: (The T0 selected input clock is disquali-
fied AND Another input clock is switched to) OR (In Revertive switch, a
qualified input clock with a higher priority is switched to) OR (The T0
selected input clock is switched to another one by External Fast selec-
tion or Forced selection).
Refer to Table 14 for details about the input clock qualification for T0
path.
3.9.2
T4 SELECTED INPUT CLOCK VS. DPLL OPERATING
MODE
The T4 DPLL operating mode is controlled by the
T4_OPERATING_MODE[2:0] bits, as shown in Table 17:
When the operating mode is switched automatically, the operation of
the internal state machine is shown in Figure 7:
Figure 7. T4 Selected Input Clock vs. DPLL Automatic
Operating Mode
Notes to Figure 7:
1. Reset.
2. An input clock is selected.
3. (The T4 selected input clock is disqualified) OR (A qualified input
clock with a higher priority is switched to) OR (The T4 selected
input clock is switched to another one by Forced selection) OR
(When T4 DPLL locks to the T0 DPLL output, the T4 selected
input clock is switched by setting the T0_FOR_T4 bit).
4. An input clock is selected.
5. No input clock is selected.
Refer to Table 14 for details about the input clock qualification for T4
path.
Table 17: T4 DPLL Operating Mode Control
T4_OPERATING_MODE[2:0]
T4 DPLL Operating Mode
000
Automatic
001
Forced - Free-Run
010
Forced - Holdover
100
Forced - Locked
2
Locked mode
Holdover
mode
Free-Run mode
1
3
4
5
Table 18: Related Bit / Register in Chapter 3.9
Bit
Register
Address
(Hex)
T0_OPERATING_MODE[2:0] T0_OPERATING_MODE_CNFG
53
T4_OPERATING_MODE[2:0] T4_OPERATING_MODE_CNFG
54
T0_DPLL_OPERATING_MOD
E[2:0]
OPERATING_STS
52
T0_DPLL_LOCK
T0_OPERATING_MODE 1
INTERRUPTS2_STS
0E
T0_OPERATING_MODE 2
INTERRUPTS2_ENABLE_CNFG
11
T0_FOR_T4
T4_INPUT_SEL_CNFG
51
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