IDT82V3202NLG【PDF 40/117 页】IC PLL WAN EBU SGL 68-VFQFPN

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IDT82V3202

EBU WAN PLL

Functional Description

September 11, 2009

3.9

SELECTED INPUT CLOCK STATUS VS. DPLL

OPERATING MODE

T0 DPLL supports three primary operating modes: Free-Run, Locked

and Holdover, and three secondary, temporary operating modes: Pre-

Locked, Pre-Locked2 and Lost-Phase. The operating mode of T0 DPLL

can be switched automatically or by force, as controlled by the

T0_OPERATING_MODE[2:0] bits.

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 machine for T0 automatically determine the operating mode.

The T0 DPLL operating mode is controlled by the

T0_OPERATING_MODE[2:0] bits, as shown in Table 14:

When the operating mode is switched automatically, the operation of

the internal state machine is shown in Figure 7.

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.

Figure 7. T0 Selected Input Clock vs. DPLL Automatic Operating Mode

Table 14: 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

Free-Run mode

Pre-Locked

mode

Locked

mode

Lost-Phase

mode

Holdover

mode

Pre-Locked2

mode

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