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IDT82V3202
EBU WAN PLL
Functional Description
29
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
1
Pre-Locked
mode
2
3
4
Locked
mode
5
Lost-Phase
mode
Holdover
mode
7
8
Pre-Locked2
mode
13
14
15
6
12
11
9
10
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