82V3001 IDT [Integrated Device Technology], 82V3001 Datasheet - Page 10

• Manufacturer Part Number: 82V3001
• Description: WAN PLL WITH SINGLE REFERENCE INPUT
• Manufacturer: IDT [Integrated Device Technology]

IDT82V3001A WAN PLL WITH SINGLE REFERENCE INPUT
3
providing timing (clock) and synchronization (framing) signals to
interface circuits for T1 and E1 Primary Rate Digital Transmission links.
See
3.1
As shown in
enable/disable the TIE Control Block and control the operation mode of
the DPLL Block based on MODE_sel0 and MODE_sel1 and TIE_en
pins.
Holdover and Freerun. The mode selection pins, MODE_sel1 and
MODE_sel0 select the operation mode. See
Table - 2 Operating Modes and Status
F8o. As shown in
one to another by the MODE_sel0 and MODE_sel1 pins, except the
mode changes between Normal (S1) and Auto-Holdover (S2). The
mode changes between Normal (S1) and Auto-Holdover (S2) are
triggered by the Invalid Input Reference Detection Circuit and irrelative
to the MODE_sel0 and MODE_sel1 pins. That is, at the stage of S1, the
operating mode will be changed automatically from Normal (S1) to Auto-
Holdover (S2) if an invalid input reference is detected (input reference is
out of the capture range). If the input reference becomes valid (within
the capture range), the operating mode will be changed back to Normal
(S1) automatically.
control block will be disabled automatically as shown in
except the change from Holdover (S3) or Auto-Holdover (S2) to Normal
(S1). In the case of changing from Holdover (S3) or Auto-Holdover (S2)
to Normal (S1), the TIE control block can be manually enabled or
disabled by the TIE_en pin, as required.
MODE_sel1
The IDT82V3001A is a WAN PLL with single reference input,
The State Control Circuit is an important part of the IDT82V3001A.
The IDT82V3001A has three possible modes of operation: Normal,
All state control changes occur synchronously on the rising edge of
When the operating mode is changed from one to another, the TIE
Figure -
Signal Detection
0
0
1
1
Output of the
Invalid Input
1. The detail is described in the following sections.
FUNCTIONAL DESCRIPTION
STATE CONTROL CIRCUIT
Figure -
Figure -
Figure - 3 State Control Block
MODE_sel0
3, the State Control Circuit outputs signals to
Enable/Disable
TIE_en
TIE Block
0
1
0
1
4, the operating mode can be changed from
State Control Circuit
MODE_sel1
Mode Control
Table -
DPLL Block
MODE_sel0
Reserved
Holdover
Freerun
Normal
2.
Mode
F8o
Figure -
4,
10
INDUSTRIAL TEMPERATURE RANGE