ZL30407QCG1 Zarlink, ZL30407QCG1 Datasheet - Page 22

• Manufacturer Part Number: ZL30407QCG1
• Description: PB FREE SONET/SDH NETWORK ELEMENT PLL
• Manufacturer: Zarlink

4.1
The Hardware control is a subset of software control and it will only be briefly described with cross-referencing to
Software control programmable registers.
4.1.1
The ZL30407 has five dedicated control pins for selecting modes of operation and activating different functions.
These pins are listed below:
MS2 and MS1 pins: Mode Select: The MS2 (pin 19) and MS1 (pin 18) inputs select the PLL mode of operation.
See Table 2 for details. The logic level at these inputs is sampled by the rising edge of the F8o frame pulse.
Hardware Control
Control Pins
HOLDOVER
MS2
RefAlign
SECOR
PRIOR
0
0
1
1
RefSel
LOCK
MS2
MS1
FCS
Pins
Hardware Control
MS1
0
1
0
1
Figure 7 - Hardware and Software Control Options
C
O
N
T
R
O
L
S
T
A
T
U
S
Normal mode
Holdover mode
Free-run
Reserved
Table 2 - Operating Modes and States
HW = 1
Zarlink Semiconductor Inc.
ZL30407
22
Mode of Operation
Processor
Interface
HOLDOVER
RefAlign
SECOR
RefSel
AHRD
PRIOR
FCS2
MHR
LOCK
Software Control
SAFL
MS2
MS1
PAFL
FCS
FLIM
SAH
PAH
HW = 0
C
O
N
T
R
O
L
S
T
A
T
U
S
Data Sheet