ZARLINK ZL30402

ZL30402
SONET/SDH Network Element PLL
Data Sheet
Features
November 2004
•
Meets requirements of GR-253 for SONET
stratum 3 and SONET Minimum Clocks (SMC)
•
Meets requirements of GR-1244 for stratum 3
•
Meets requirements of G.813 Option 1 and 2 for
SDH Equipment Clocks (SEC)
•
Generates clocks for ST-BUS, DS1, DS2, DS3,
OC-3, E1, E2, E3, STM-1 and 19.44 MHz
Ordering Information
ZL30402/QCC
80 Pin LQFP Trays
ZL30402QCC1
80 Pin LQFP* Trays
*Pb Free Matte Tin
-40°C to +85°C
Description
-12
•
Holdover accuracy to 1x10
meets GR-1244
Stratum 3E and ITU-T G.812 requirements
•
Continuously monitors Primary and Secondary
reference clocks
•
Provides “hit-less” reference switching
•
Compensates for Master Clock Oscillator
accuracy
•
Detects frequency of both reference clocks and
synchronizes to any combination of 8 kHz,
1.544 MHz, 2.048 MHz and 19.44 MHz reference
frequencies.
•
Allows Hardware or Microprocessor control
•
Pin compatible with MT90401 device.
The ZL30402 is a Network Element Phase-Locked
Loop designed to synchronize SDH and SONET
systems. In addition, it generates multiple clocks for
legacy PDH equipment and provides timing for ST-BUS
and GCI backplanes.
The ZL30402 operates in NORMAL (LOCKED),
HOLDOVER and FREE-RUN modes to ensure that in
the presence of jitter, wander and interruptions to the
reference signals, the generated clocks meet
international standards. The filtering characteristics of
the PLL are hardware or software selectable and they
do not require any external adjustable components.
The ZL30402 uses an external 20 MHz Master Clock
Oscillator to provide a stable timing source for the
HOLDOVER operation.
Applications
•
Synchronization for SDH and SONET Network
Elements
•
Clock generation for ST-BUS and GCI
backplanes
VDD GND
PRI
Primary
Acquisition
PLL
The ZL30402 operates from a single 3.3 V power
supply and offers a 5 V tolerant microprocessor
interface.
C20i
FCS
Master Clock
Frequency
Calibration
APLL
Core PLL
MUX
SEC
Clock
Synthesizer
Secondary
Acquisition
PLL
E3DS3/OC3
E3/DS3
RefSel
HW
Control State Machine
Microport
RESET
CS DS R/W A0-A6 D0-D7
C155P/N
C34/C44
C19o
C16o
C8o
C6o
C4o
C2o
C1.5o
F16o
F8o
F0o
MS1 MS2
JTAG
IEEE
1149.1a
RefAlign LOCK HOLDOVER
Figure 1 - Functional Block Diagram
1
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Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.
Copyright 2003-2004, Zarlink Semiconductor Inc. All Rights Reserved.
Tclk
Tdi
Tdo
Tms
Trst
ZL30402
Data Sheet
Table of Contents
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.0 ZL30402 Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Pin Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.0 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 Acquisition PLLs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Core PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3 Clock Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.4 Output Clocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.5 Output Clocks Phase Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.6 Control State Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.6.1 Clock Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.6.2 ZL30402 State Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.6.3 Reset State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.6.4 Free-Run State (Free-Run mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.6.5 Normal State (Normal Mode or Locked Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.6.6 Holdover State (Holdover Mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.6.7 Auto Holdover State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.6.8 State Transitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.0 Master Clock Frequency Calibration Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 Microprocessor Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.2 JTAG Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.0 Hardware and Software Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1 Hardware Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1.1 Control Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1.2 Status Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2 Software Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2.1 Control Bits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2.2 Status Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2.3 ZL30402 Register Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2.4 Register Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.0 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.1 ZL30402 Mode Switching - Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.1.1 System Start-up Sequence: FREE-RUN --> HOLDOVER --> NORMAL . . . . . . . . . . . . . . . . . . . . . 25
5.1.2 Single Reference Operation: NORMAL --> AUTO HOLDOVER --> NORMAL . . . . . . . . . . . . . . . . 26
5.1.3 Dual Reference Operation: NORMAL --> AUTO HOLDOVER--> HOLDOVER --> NORMAL. . . . . 27
5.1.4 Reference Switching (RefSel): NORMAL --> HOLDOVER --> NORMAL . . . . . . . . . . . . . . . . . . . . 28
5.2 Programming Master Clock Oscillator Frequency Calibration Register . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.0 Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.1 AC and DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.2 Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
2
Zarlink Semiconductor Inc.
ZL30402
ZL30402 Pinout
1.1
Pin Connections
IC
DS
NC
LOCK
NC
HOLDOVER
VDD
C34/C44
GND
C20i
NC
VDD
RefAlign
RefSel
C19o
GND
IC
C6o
C1.5o
IC
1.0
Data Sheet
60
58
56
54
52
50
48
46
44
42 40
62
38
64
36
66
34
68
32
ZL30402
70
30
72
28
74
26
76
24
78
22
2
4
6
8
10
12
14
16
18
20
NC
NC
Tdi
Trst
Tclk
Tms
Tdo
NC
GND
C155P
C155N
VDD
AVDD
GND
IC
GND
PRI
SEC
E3/DS3
E3DS3/OC3
MS1
MS2
F8o
80
IC
A1
A2
A3
A4
GND
A5
A6
FCS
VDD
GND
F16o
C16o
C8o
C4o
C2o
F0o
IC
OE
CS
RESET
HW
D0
D1
D2
D3
GND
IC
IC
VDD
D4
D5
D6
D7
R/W
A0
IC
Figure 2 - Pin Connections for 80-pin LQFP package
3
Zarlink Semiconductor Inc.
ZL30402
Data Sheet
Pin Description
Pin #
Name
Description
1
IC
2-5
A1-A4
Address 1 to 4 (5 V tolerant input). Address inputs for the parallel processor
interface. Connect to ground in Hardware Control.
6
GND
Ground. Negative power supply.
7-8
A5-A6
Address 5 to 6 (5 V tolerant input). Address inputs for the parallel processor
interface. Connect to ground in Hardware Control.
9
FCS
Filter Characteristic Select (Input). In Hardware Control, FCS selects the
filtering characteristics of the ZL30402. Set this pin high to have a loop filter
corner frequency of 0.1 Hz and limit the phase slope to 885 ns per second. Set
this pin low to have corner frequency of 1.1Hz and limit the phase slope to
41 ns per 1.326 ms. Connect to ground in Software Control. This pin is
internally pulled down to GND.
10
VDD
Positive Power Supply.
11
GND
Ground.
12
F16o
Frame Pulse ST-BUS 8.192 Mb/s (CMOS tristate output). This is an 8 kHz,
61 ns wide, active low framing pulse, which marks beginning of a ST-BUS
frame. This frame pulse is typically used for ST-BUS operation at 8.192 Mb/s
13
C16o
Clock 16.384 MHz (CMOS tristate output). This clock is used for ST-BUS
operation at 8.192 Mb/s.
14
C8o
Clock 8.192 MHz (CMOS tristate output). This clock is used for ST-BUS
operation at 8.192 Mb/s.
15
C4o
Clock 4.096 MHz (CMOS tristate output). This clock is used for ST-BUS
operation at 2.048 Mb/s.
16
C2o
Clock 2.048 MHz (CMOS tristate output). This clock is used for ST-BUS
operation at 2.048 Mb/s.
17
F0o
Frame Pulse ST-BUS 2.048 Mb/s (CMOS tristate output). This is an 8 kHz,
244 ns, active low framing pulse, which marks the beginning of a ST-BUS
frame. This is typically used for ST-BUS operation at 2.048 Mb/s and
4.096 Mb/s.
18
MS1
Mode Select 1 (Input). The MS1 and MS2 pins select the ZL30402 mode of
operation (Normal, Holdover or Free-run), see Table 1 on page 15 for details.
The logic level at this input is sampled by the rising edge of the F8o frame
pulse. Connect to ground in Software Control.
19
MS2
Mode Select 2 (Input). The MS2 and MS1 pins select the ZL30402 mode of
operation (Normal, Holdover or Free-run), see Table 1 on page 15 for details.
The logic level at this input is sampled by the rising edge of the F8o frame
pulse. Connect to ground in Software Control.
Internal Connection. Leave unconnected.
4
Zarlink Semiconductor Inc.
ZL30402
Data Sheet
Pin Description (continued)
Pin #
Name
Description
20
F8o
Frame Pulse ST-BUS/GCI 8.192 Mb/s (CMOS tristate output). This is an
8 kHz, 122 ns, active high framing pulse, which marks the beginning of a STBUS/GCI frame. This is typically used for ST-BUS/GCI operation at
8.192 Mb/s. See Figure 13 for details.
21
E3DS3/OC3
E3DS3 or OC3 Selection (Input). In Hardware Control, a logic low on this pin
enables the C155P/N outputs (pin 30 and pin 31) and sets the C34/C44 output
(pin 53) to provide C8 or C11 clocks. Logic high at this input disables the C155
clock outputs (high impedance) and sets C34/C44 output to provide C34 and
C44 clocks. In Software Control connect this pin to ground.
22
E3/DS3
E3 or DS3 Selection (Input). In Hardware Control, when the E3DS3/OC3 pin
is set high, logic low on E3/DS3 pin selects a 44.736 MHz clock on C34/C44
output and logic high selects 34.368 MHz clock. When E3DS3/OC3 pin is set
low, logic low on E3/DS3 pin selects 11.184 MHz clock on C34/C44 output and
logic high selects 8.592 MHz clock. Connect this input to ground in Software
Control.
23
SEC
Secondary Reference (Input). This input is used as a secondary reference
source for synchronization. The ZL30402 can synchronize to the falling edge
of the 8 kHz, 1.544 MHz or 2.048 MHz clocks and the rising edge of the
19.44 MHz clock. In Hardware Control, selection of the input reference is
based upon the RefSel control input. This pin is internally pulled up to VDD.
24
PRI
Primary Reference (Input). This input is used as a primary reference source
for synchronization. The ZL30402 can synchronize to the falling edge of the
8 kHz, 1.544 MHz or 2.048 MHz clocks and the rising edge of the 19.44 MHz
clock. In Hardware Control, selection of the input reference is based upon the
RefSel control input. This pin is internally pulled up to VDD.
25
GND
Ground.
26
IC
27
GND
Ground.
28
AVDD
Positive Analog Power Supply. Connect this pin to VDD.
29
VDD
30
31
C155N
C155P
32
GND
33
NC
No internal bonding Connection. Leave unconnected.
34
Tdo
IEEE1149.1a Test Data Output (CMOS output). JTAG serial data is output on
this pin on the falling edge of Tclk clock. If not used, this pin should be left
unconnected.
Internal Connection. Leave unconnected.
Positive Power Supply.
Clock 155.52 MHz (LVDS output). Differential outputs for a 155.52 MHz clock.
These outputs are enabled by applying logic low to E3DS3/OC3 input or they
can be switched into high impedance state by applying logic high.
Ground.
5
Zarlink Semiconductor Inc.
ZL30402
Data Sheet
Pin Description (continued)
Pin #
Name
Description
35
Tms
IEEE1149.1a Test Mode Selection (3.3 V input). JTAG signal that controls the
state transition on the TAP controller. This pin is internally pulled up to VDD. If
not used, this pin should be left unconnected.
36
Tclk
IEEE1149.1a Test Clock Signal (5.5 V tolerant input). Input clock for the
JTAG test logic. If not used, this pin should be pulled up to VDD.
37
Trst
IEEE1149.1a Reset Signal (3.3 V input). Asynchronous reset for the JTAG
TAP controller. This pin should be pulsed low on power-up to ensure that the
device in the normal functional state. This pin is internally pulled up to VDD. If
not used, this pin should be connected to GND.
38
Tdi
IEEE1149.1a Test Data Input (3.3 V input). Input for JTAG serial test
instructions and data. This pin is internally pulled up to VDD. If not used, this
pin should be left unconnected.
39
NC
No internal bonding Connection. Leave unconnected.
40
NC
No internal bonding Connection. Leave unconnected.
41
IC
Internal Connection. Leave unconnected.
42
C1.5o
Clock 1.544 MHz (CMOS tristate output). This output provides a 1.544 MHz
DS1 rate clock.
43
C6o
Clock 6.312 MHz (CMOS tristate output). This output provides a 6.312 MHz
DS2 rate clock.
44
IC
45
GND
Ground.
46
C19o
Clock 19.44 MHz (CMOS tristate output). This output provides a 19.44 MHz
clock.
47
RefSel
Reference Source Select (Input). A logic low selects the PRI (primary)
reference source as the input reference signal and logic high selects the SEC
(secondary) input. The logic level at this input is sampled at the rising edge of
F8o. This pin is internally pulled down to GND.
48
RefAlign
49
VDD
50
NC
51
C20i
Clock 20 MHz (5.5 V tolerant input). This pin is the input for the 20 MHz
Master Clock Oscillator.
52
GND
Digital Ground.
Internal Connection. Connect this pin to Ground.
Reference Align (Input). In Hardware Control a high to low transition at this
input initiates phase realignment between the input reference and the
generated output clocks. This pin is internally pulled down to GND.
Positive Power Supply.
No internal bonding Connection. Leave unconnected.
6
Zarlink Semiconductor Inc.
ZL30402
Data Sheet
Pin Description (continued)
Pin #
Name
Description
53
C34/C44
Clock 34.368 MHz / clock 44.736 MHz (CMOS Output). This clock is
programmable to be either 34.368 MHz (for E3 applications) or 44.736 MHz
(for DS3 applications) when E3DS3/OC3 is high, or to be either 8.592MHz or
11.184 MHz when E3DS3/OC3 is low. See description of E3DS3/OC3 and
E3/DS3 inputs for details. In Software Control the functionality of this output is
controlled by Control Register 2 (Table 7 "Control Register 2 (R/W)").
54
VDD
55
HOLDOVER
56
NC
57
LOCK
58
NC
No internal bonding Connection. Leave unconnected.
59
DS
Data Strobe (5 V tolerant input). This input is the active low data strobe of the
processor interface.
60
IC
Internal Connection. Connect to ground.
61
IC
Internal Connection. Leave unconnected.
62
OE
Output Enable (Input). Logic high on this input enables C19, F16, C16, C8,
C6, C4, C2, C1.5, F8 and F0 signals. Pulling this input low will force the output
clocks pins into a high impedance state.
63
CS
Chip Select (5 V tolerant input). This active low input enables the
microprocessor interface. When CS is set to high, the microprocessor interface
is idle and all Data Bus I/O pins will be in a high impedance state.
64
RESET
RESET (5 V tolerant input). This active low input forces the ZL30402 into a
RESET state. The RESET pin must be held low for a minimum of 1µs to reset
the device properly. The ZL30402 must be reset after power-up.
65
HW
Hardware/Software Control (Input). If this pin it tied low, the ZL30402 is
controlled via the microport. If it is tied high, the ZL30402 is controlled via the
control pins MS1, MS2, FCS, RefSel, RefAlign, E3/DS3 and E3DS3/OC3.
66-69
D0 - D3
Data 0 to Data 3 (5 V tolerant three-state I/O). These signals combined with
D4 - D7 form the bi-directional data bus of the microprocessor interface (D0 is
the least significant bit).
70
GND
71
IC
Internal Connection (Input). Connect this pin to ground.
72
IC
Internal Connection (Input). Connect this pin to ground.
73
VDD
Positive Power Supply.
Holdover Indicator (CMOS output). Logic high at this output indicates that the
device is in Holdover mode.
No internal bonding Connection. Leave unconnected.
Lock Indicator (CMOS output). Logic high at this output indicates that
ZL30402 is locked to the input reference.
Ground.
Positive Power Supply.
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Zarlink Semiconductor Inc.
ZL30402
Data Sheet
Pin Description (continued)
2.0
Pin #
Name
Description
74 - 77
D4 - D7
Data 4 to Data 7 (5 V tolerant three-state I/O). These signals combine with D0
- D3 form the bi-directional data bus of the processor interface (D7 is the most
significant bit).
78
R/W
Read/Write Strobe (5 V tolerant input). This input controls the direction of the
data bus D[0-7] during a microprocessor access. When R/W is high, the
parallel processor is reading data from the ZL30402. When low, the parallel
processor is writing data to the ZL30402.
79
A0
Address 0 (5 V tolerant input). Address input for the microprocessor interface.
A0 is the least significant input.
80
IC
Internal Connection (Input). Connect this pin to ground.
Functional Description
The ZL30402 is a Network Element PLL designed to provide timing for SDH and SONET equipment conforming to
ITU-T, ANSI, ETSI and Telcordia recommendations. In addition, it generates clocks for legacy PDH equipment
operating at DS1, DS2, DS3, E1, and E3 rates. The ZL30402 provides clocks for industry standard ST-BUS and
GCI backplanes, and it also supports H.110 timing requirements. The functional block diagram of the ZL30402 is
shown in Figure 1 "Functional Block Diagram" and its operation is described in the following section.
2.1
Acquisition PLLs
The ZL30402 has two Acquisition PLLs for monitoring availability and quality of the Primary (PRI) and Secondary
(SEC) reference clocks. Each Acquisition PLL operates independently and locks to the falling edges of one of the
three input reference frequencies: 8 kHz, 1.544 MHz, 2.048 MHz or to the rising edge of 19.44 MHz. The reference
frequency can be determined from reading the Acquisition PLL Status Register bits InpFreq1 and InpFreq0 (see
Table 16 "Primary Acquisition PLL Status Register (R)" and Table 17 "Secondary Acquisition PLL Status Register
(R)").
The Primary and Secondary Acquisition PLLs are designed to provide status information that identifies two levels of
reference clock quality. For clarity, only the Primary Acquisition PLL is referenced in the text, but the same applies
to the Secondary Acquisition PLL.
-
Reference frequency drifts more than ±30000 ppm or is lost completely. In response, the Primary Acquisition
PLL enters its own Holdover mode and indicates this by asserting the HOLDOVER bit in the Primary
Acquisition PLL Status Register (Table 16 "Primary Acquisition PLL Status Register (R)"). Entry into Holdover
forces the Core PLL into the Auto Holdover state.
-
Reference frequency drifts more than ±104 ppm. In response the Primary Acquisition PLL asserts the
Frequency Limit bit PAFL in its Primary Acquisition PLL Status Register (Table 16) indicating that the
reference frequency crossed the boundary of the capture range.
Outputs of both Acquisition PLLs are connected to a multiplexer (MUX), which allows selecting a reference signal
that guarantees better traceability to the Primary Reference Clock. This multiplexer channels binary words to the
Core PLL digital phase detector (instead of analog signals). Application of the digital phase detector in the Core
PLL eliminates quantization errors and improves phase alignment accuracy.
The bandwidth of the Acquisition PLL is much wider than the bandwidth of the following Core PLL. This feature
allows cascading Acquisition and Core PLLs without changing the transfer function of the Core PLL.
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Zarlink Semiconductor Inc.
ZL30402
2.2
Data Sheet
Core PLL
The most critical element of the ZL30402 is its Core PLL, which generates a phase-locked clock, filters jitter and
wander and suppresses input phase transients. All of these features are in agreement with international standards:
-
G.813 Option 1 and 2 clocks for SDH equipment
-
GR-253 for SONET stratum 3 and SONET Minimum Clocks (SMC)
-
GR-1244 for stratum 3 Clocks
The Core PLL supports three mandatory modes of operation: Free-run, Normal (Locked) and Holdover. Each of
these modes places specific requirements on the building blocks of the Core PLL.
-
In Free-run Mode, the Core PLL locks to the 20 MHz Master Clock Oscillator connected to pin C20i. The
stability of the generated clock remains the same as the stability of the Master Clock Oscillator but frequency
accuracy is greatly improved by the Master Clock Frequency Calibration register. This register compensates
oscillator frequency, practically eliminating manufacturing tolerances.
-
In Normal Mode, the Core PLL locks to one of the Acquisition PLLs. Both Acquisition PLLs provide
preprocessed phase data to the Core PLL including detection of reference clock quality. This preprocessing
reduces the load on the Core PLL and improves quality of the generated clock.
-
In Holdover mode, the Core PLL generates a clock based on data collected from past reference signals. The
Core PLL enters Holdover mode if the attached Acquisition PLL switches into the Holdover state or under
external software or hardware control.
Some of the key elements of the Core PLL are shown in Figure 3 "Core PLL Functional Block Diagram".
LOCK
RefAlign
MUX
FSM
Phase
Detector
Filters
DCO
FCS
Figure 3 - Core PLL Functional Block Diagram
Digitally Controlled Oscillator (DCO): The DCO is an arithmetic unit that continuously generates a stream of
numbers that represent the phase-locked clock. These numbers are passed to the Clock Synthesizer (see
section 2.3) where they are converted into electrical clock signals of different frequencies.
Filters: In Normal mode, the clock generated by the DCO is phase-locked to the input reference signal and bandlimited to meet network synchronization standards. The ZL30402 provides two software programmable (Control
Reg 1) and two hardware selectable (FCS pin) filtering options. The filtering characteristics are similar to a first
order low pass filter with corner frequencies that support international standards:
-
0.1 Hz filter: supports G.813 Option 2 Clock, GR-253 SONET stratum 3 and GR-253 SONET Minimum clock
-
1.1 Hz filter: supports G.813 Option 1 and GR-1244 stratum 3 clock
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Zarlink Semiconductor Inc.
ZL30402
Data Sheet
Lock Indicator: Entry into Normal mode is flagged by the LOCK status bit or pin. Lock is declared when the
Acquisition PLL is locked to the reference clock and the Core PLL is locked to the Acquisition PLL. Frequency lock
means that the center frequency of the PLL is identical to the reference frequency and phase error excursions
caused by jitter and wander are symmetrical around some long-term phase error average.
Reference Re-alignment: Reference realignment is performed to erase a residual phase error that has been
accumulated between the reference and output clocks as a result of reference switching. A high to low transition on
the RefAlign pin (or bit) initiates phase realignment with a phase slope on the output clocks limited to 41 ns in 1.326
ms for the 1.1 Hz filter and to 885 ns in 1 s for 0.1 Hz filter. Please refer to the ZLAN-27 "Phase Alignment between
8 kHz output and 8 kHz Input Reference on ZL30402" Application Note for details.
2.3
Clock Synthesizer
The output of the Core PLL is connected to the Clock Synthesizer that generates twelve clocks and three frame
pulses.
2.4
Output Clocks
The ZL30402 provides the following clocks (see Figure 13 "ST-BUS and GCI Output Timing", Figure 14 "DS1, DS2
and C19o Clock Timing", Figure 15 "C155o and C19o Timing", and Figure 18 "E3 and DS3 Output Timing" for
details):
- C1.5o
: 1.544 MHz clock with nominal 50% duty cycle
- C2o
: 2.048 MHz clock with nominal 50% duty cycle
- C4o
: 4.096 MHz clock with nominal 50% duty cycle
- C6o
: 6.312 MHz clock with nominal 50% duty cycle
- C8o
: 8.192 MHz clock with nominal 50% duty cycle
- C8.5o
: 8.592 MHz clock with duty cycle from 30 to 70%.
- C11o
: 11.184 MHz clock with duty cycle from 30 to 70%.
- C16o
: 16.384 MHz clock with nominal 50% duty cycle
- C19o
: 19.44 MHz clock with nominal 50% duty cycle (with optional dejittering)
- C34o
: 34.368 MHz clock with nominal 50% duty cycle
- C44o
: 44.736 MHz clock with nominal 50% duty cycle
- C155
: 155.52 MHz clock with nominal 50% duty cycle.
The ZL30402 provides the following frame pulses (see Figure 13 "ST-BUS and GCI Output Timing" for details). All
frame pulses have the same 125 µs period (8kHz frequency):
- F0o
: 244 ns wide, logic low frame pulse
- F8o
: 122 ns wide, logic high frame pulse
- F16o
: 61 ns wide, logic low frame pulse
The Clock Synthesizer has an internal analog PLL (APLL) that can be placed in the path of the digitally generated
clocks to multiply frequencies and reduce jitter. The combination of two pins, E3DS3/OC3 and E3DS3, controls the
placement of the APLL and allows for selection of different clock configurations e.g., if E3DS3/OC3 pin is low the
19.44 MHz clock is derived from 155.52 MHz clock with very low jitter. The same APLL can be used to generate
clocks with E3, DS3 or OC3 rates (see Figure 4 "C19o, C155o, C34/C44 Clock Generation Options" for details).
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Zarlink Semiconductor Inc.
ZL30402
C19o Output
E3DS3/OC3
E3DS3/OC3
0
1
0
1
155.52
HIZ
19.44
Dejittered
19.44
C34/44 Output
E3DS3/OC3
0
E3/DS3
C155 Output
Data Sheet
1
0
11.184
44.736
1
8.592
34.368
Figure 4 - C19o, C155o, C34/C44 Clock Generation Options
All clocks and frame pulses except the C155 are output with CMOS logic levels. The C155 clock (155.52MHz) is
output in a standard LVDS format.
2.5
Output Clocks Phase Adjustment
The ZL30402 provides three control registers dedicated to programming the output clock phase offset. Clocks
C16o, C8o, C4o and C2o and frame pulses F16o, F8o, F0o are derived from 16.384 MHz and can be jointly shifted
with respect to an active reference clock by up to 125 µs with a step size of 61 ns. The required phase shift of
clocks is programmable by writing to the Phase Offset Register 2 ("Table 8") and to the Phase Offset Register 1
("Table 9"). The C1.5o clock can be shifted as well in step sizes of 81ns by programming C1.5POA bits in Control
Register 3 ("Table 11").
The coarse phase adjustment is augmented with a very fine phase offset control on the order of 477 ps per step.
This fine adjustment is programmable by writing to the Fine Phase Offset Register (Table 15 "Fine Phase Offset
Register (R/W)"). The offset moves all clocks and frame pulses generated by ZL30402 including C155 clock.
2.6
2.6.1
Control State Machine
Clock Modes
Any Network Element that operates in a synchronous network must support three Clock Modes: Free-run, Normal
(Locked) and Holdover. These clock modes determine behavior of a Network Element to the unforeseen changes in
the network synchronization hierarchy. Requirements for Clock Modes are defined in the international standards
e.g.: G.813, GR-1244-CORE and GR-253-CORE and they are very strictly enforced by network operators. The
ZL30402 supports all clock modes and each of these modes have a corresponding state in the Control State
Machine.
2.6.2
ZL30402 State Machine
The ZL30402 Control State Machine is a complex combination of many internal states supporting the three
mandatory clock modes. The simplified version of this state machine is shown in Figure 5 and it includes the
mandatory states: Free-run, Normal and Holdover. These three states are complemented by two additional states:
Reset and Auto Holdover, which are critical to the ZL30402 operation under the changing external conditions.
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Zarlink Semiconductor Inc.
ZL30402
MS2, MS1 == 01 OR
RefSel change
RESET == 1
FREERUN
10
RESET
Ref: FAIL --> OK &
MS2, MS1 == 00 &
AHRD=1 &
MHR= 0-->1 then 1-->0
{MANUAL}
NORMAL
(LOCKED)
00
Ref: OK &
MS2, MS1 == 00
{AUTO}
MS2, MS1! = 10
Data Sheet
Ref: OK --> FAIL &
MS2, MS1 == 00
{AUTO}
AUTO
HOLDOVER
RefSel Change
HOLDOVER
01
Ref: FAIL --> OK &
MS2, MS1 == 00 &
AHRD=0 &
{AUTO}
MS2, MS1 == 10 forces
unconditional return from
any state to Free-run
Notes:
==: equal
{AUTO}: Automatic transition
! =: not equal
AUTO HOLDOVER: Automatic Holdover
& =: AND Operation
0 --> 1: transition from 0 to 1
STATE
MS2, MS1
Figure 5 - ZL30402 State Machine
2.6.3
Reset State
The Reset State must be entered when ZL30402 is powered-up. In this state, all arithmetic calculations are halted,
clocks are stopped, the microprocessor port is disabled and all internal registers are reset to their default values.
The Reset state is entered by pulling the RESET pin low for a minimum of 1 µs. When the RESET pin is pulled back
high, internal logic starts a 500 µs initialization process before switching into the Free-run state (MS2, MS1 = 10).
2.6.4
Free-Run State (Free-Run mode)
The Free-run state is entered when synchronization to the network is not required or is not possible. Typically this
occurs during installation, repairs or when a Network Element operates as a master node in an isolated network. In
the Free-run state, the accuracy of the generated clocks is determined by the accuracy and stability of the ZL30402
Master Crystal Oscillator. When equipment is installed for the first time (or periodically maintained) the accuracy of
the Free-run clocks can be adjusted to within 1x10-12 by setting the offset frequency in the Master Clock Frequency
Calibration Register.
2.6.5
Normal State (Normal Mode or Locked Mode)
The Normal State is entered when a good quality reference clock from the network is available for synchronization.
The ZL30402 automatically detects the frequency of the reference clock (8 kHz, 1.544 MHz, 2.048 MHz or
19.44 MHz) and sets the LOCK status bit and pin high after acquiring synchronization. In the Normal state all
generated clocks (C1.5o, C2o, C4o, C6o, C8o, C16o, C19o, C34/C44 and C155) and frame pulses (F0o, F8o,
F16o) are derived from network timing. To guarantee uninterrupted synchronization, the ZL30402 has two
Acquisition PLLs that continuously monitor the quality of the incoming reference clocks. This dual architecture
enables quick replacement of a poor or failed reference and minimizes the time spent in other states.
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Zarlink Semiconductor Inc.
ZL30402
2.6.6
Data Sheet
Holdover State (Holdover Mode)
The Holdover State is typically entered for short durations while network synchronization is temporarily disrupted. In
Holdover Mode, the ZL30402 generates clocks, which are not locked to an external reference signal but their
frequencies are based on stored coefficients in memory that were determined while the PLL was in Normal Mode
and locked to an external reference signal.
The initial frequency offset of the ZL30402 in Holdover Mode is 1x10-12. This is more accurate than Telcordia’s GR1244-CORE stratum 3E requirement of +1x10-9. Once the ZL30402 has transitioned into Holdover Mode, holdover
stability is determined by the stability of the 20MHz Master Clock Oscillator. Selection of the oscillator requires close
examination of the crystal oscillator temperature sensitivity and frequency drift caused by aging.
2.6.7
Auto Holdover State
The Auto Holdover state is a transitional state that the ZL30402 enters automatically when the active reference fails
unexpectedly. When the ZL30402 detects loss of reference it sets the HOLDOVER status bit and waits in Auto
Holdover state until the failed reference recovers. The HOLDOVER status may alert the control processor about the
failure and in response the control processor may switch to the secondary reference clock. The Auto Holdover and
Holdover States are internally combined together and they are output as a HOLDOVER status on pin 55 and bit 4 in
Status Register 1 (Table 6 on page 19).
2.6.8
State Transitions
In a typical Network Element application, the ZL30402 will typically operate in Normal mode (MS2, MS1 == 00)
generating synchronous clocks. Its two Acquisition PLLs will continuously monitor the input references for signs of
degraded quality and output status information for further processing. The status information from the Acquisition
PLLs and the CORE PLL combined with status information from line interfaces and framers (as listed below) forms
the basis for creating reliable network synchronization.
•
Acquisition PLLs (PAH, PAFL, SAH, SAFL) and
•
Core PLL (LOCK, HOLDOVER, FLIM)
•
Line interfaces (e.g. LOS - Loss of Signal, AIS - Alarm Indication Signal) and
•
Framers (e.g. LOF - Loss of frame or Synchronization Status Messages carried over SONET S1 byte or
ESF-DS1 Facility Data Link).
The ZL30402 State Machine is designed to perform some transitions automatically, leaving other less time
dependent tasks to the control processor. The state machine includes two stimulus signals which are critical to
automatic operation: “OK --> FAIL” and “FAIL --> OK” that represent loss (and recovery) of reference signal or its
drift by more than ±30000 ppm. Both of them force the Core PLL to transition into and out of the Auto Holdover
state. The ZL30402 State Machine may also be driven by controlling the mode select pins or bits MS2, MS1. In
order to avoid network synchronization problems, the State Machine has built-in basic protection that does not allow
switching the Core PLL into a state where it cannot operate correctly e.g. it is not possible to force the Core PLL into
Normal mode when all references are lost.
3.0
Master Clock Frequency Calibration Circuit
In an ordinary timing generation module, the Free-run mode accuracy of generated clocks is determined by the
accuracy of the Master Crystal Oscillator. If the Master Crystal Oscillator has a manufacturing tolerance of +/4.6 ppm, the generated clocks will have no better accuracy.
The ZL30402 eliminates tolerance problems by providing a programmable Master Clock Frequency Calibration
circuit, which can reduce oscillator manufacturing tolerance to near zero. This feature eliminates the need for high
precision 20 MHz crystal oscillators, which could be very expensive for equipment that has to maintain accuracy
over a very long period of time (e.g., 20 years in some applications).
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Zarlink Semiconductor Inc.
ZL30402
Data Sheet
The compensation value for the Master Clock Calibration Register (MCFC3 to MCFC0) can be calculated from the
following equation:
MCFC = 45036 * ( - foffset) where:
foffset = fm - 20 000 000 Hz
The fm frequency should only be measured after the Master Crystal Oscillator has been mounted inside a system
and powered long enough for the Master Crystal Oscillator to reach a steady operating temperature. Section 5.2 on
page 28 provides two examples of how to calculate an offset frequency and convert the decimal value to a binary
format. The maximum frequency compensation range of the MCFC register is equal to ±2384 ppm (±47680 Hz).
3.1
Microprocessor Interface
The ZL30402 can be controlled by a microprocessor or by an ASIC type of device that is connected directly to the
hardware control pins. If the HW pin is tied low (see Figure 6 "Hardware and Software Control options"), an 8-bit
Motorola type microprocessor may be used to control PLL operation and check its status. Under software control,
the control pins MS2, MS1, FCS, RefSel, RefAlign are disabled and they are replaced by the equivalent control bits.
The output pins LOCK and HOLDOVER are always active and they provide current status information whether the
device is in microprocessor or hardware control. Software (microprocessor) control provides additional functionality
that is not available in hardware control such as output clock phase adjustment, master clock frequency calibration
and extended access to status registers. These registers are also accessible when the ZL30402 operates under
Hardware control.
3.2
JTAG Interface
The ZL30402 JTAG (Joint Test Action Group) interface conforms to the Boundary-Scan standard IEEE1149.1-1990,
which specifies a design-for-testability technique called Boundary-Scan Test (BST). The BST architecture is made
up of four basic elements, Test Access Port (TAP), TAP Controller, Instruction Register (IR) and Test Data Registers
(TDR) and all these elements are implemented on the ZL30402.
Zarlink Semiconductor provides a Boundary Scan Description Language (BSDL) file that contains all the
information required for a JTAG test system to access the ZL30402's boundary scan circuitry. The file is available
for download from the Zarlink Semiconductor web site: www.zarlink.com.
4.0
Hardware and Software Control
The ZL30402 offers Hardware and Software Control options that simplify design of basic or complex clock
synchronization modules. Hardware control offers fewer features but still allows for building of sophisticated timing
cards without extensive programming. The complete set of control and status functions for each mode are shown in
Figure 6 "Hardware and Software Control options".
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Zarlink Semiconductor Inc.
ZL30402
Data Sheet
Hardware Control
Software Control
HW = 1
HW = 0
Pins
MS2
C
O
N
T
R
O
L
MS2
MS1
FCS
RefSel
RefAlign
MS1
FCS
RefSel
RefAlign
AHRD
C
O
N
T
R
O
L
MHR
µP
LOCK
HOLDOVER
FLIM
LOCK
S
T
A
T
U
S
HOLDOVER
PAH
PAFL
SAH
SAFL
S
T
A
T
U
S
Figure 6 - Hardware and Software Control options
4.1
Hardware Control
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
Control Pins
The ZL30402 has six 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 1 for details. The logic level at these inputs is sampled by the rising edge of the F8o frame pulse.
FCS pin: Filter Characteristic Select. The FCS (pin 9) input is used to select the filtering characteristics of the
Core PLL. See Table 2 on page 16 for details.
MS2
MS1
Mode of Operation
0
0
Normal mode
0
1
Holdover mode
1
0
Free-run
1
1
Reserved
Table 1 - Operating Modes and States
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Zarlink Semiconductor Inc.
ZL30402
FCS
Filtering Characteristic
0
Filter corner frequency set to 1.1 Hz.
This selection meets requirements of G.813 Option 1 and GR-1244 stratum 3
clocks.
1
Filter corner frequency set to 0.1 Hz.
This selection meets requirements of G.813 Option 2, GR-253 for SONET stratum 3
and GR-253 for SONET Minimum Clocks (SMC).
Data Sheet
Phase Slope
41ns
in 1.326ms
885ns/s
Table 2 - Filter Characteristic Selection
RefSel: Reference Source Select. The RefSel (pin 47) input selects the PRI (primary) or SEC (secondary) input
as the reference clock for the Core PLL. The logic level at this input is sampled by the rising edge of F8o.
RefSel
Input Reference
0
Core PLL connected to the Primary Acquisition PLL
1
Core PLL connected to the Secondary Acquisition PLL
Table 3 - Reference Source Select
RefAlign: Reference Align. The RefAlign (pin 48) input controls phase realignment between the input reference
and the generated output clocks.
4.1.2
Status Pins
The ZL30402 has two dedicated status pins for indicating modes of operation. These pins are listed below:
LOCK. This output goes high when the core PLL is locked to the selected Acquisition PLL.
HOLDOVER - This output goes high when the Core PLL enters Holdover mode. The Core PLL will switch to
Holdover mode if the respective Acquisition PLL enters Holdover mode or if the mode select pins or bits are set to
Holdover (MS2, MS1 = 01).
4.2
Software Control
Software control is enabled by setting the HW pin to logic zero (HW = 0). In this mode all hardware control pins
(inputs) are disabled and status bits (outputs) are enabled. The ZL30402 has seventeen registers that provide all
the functionality available in Hardware control and in addition they offer advanced control and monitoring that is
only available in Software control (see Figure 6 "Hardware and Software Control options").
4.2.1
Control Bits
The ZL30402 has seven control bits as is shown in Figure 6 "Hardware and Software Control options". The first five
bits replace the five hardware control pins: MS2, MS1, FCS, RefSel and RefAlign and the last two bits support
recovery from Auto Holdover mode: AHRD and MHR. These bits are described in section 3.2.4.
In addition to the Control bits shown in Figure 6 "Hardware and Software Control options", the ZL30402 has a
number of bits and registers that are accessed infrequently or during configuration only e.g., Phase Offset
Adjustment or Master Clock Frequency Calibration.
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Zarlink Semiconductor Inc.
ZL30402
4.2.2
Data Sheet
Status Bits
The ZL30402 has seven status bits (see Figure 6 "Hardware and Software Control options"). The first two bits
perform the same function as their equivalent status pins. The last five bits perform two functions. Bits FLIM, PAFL,
SAFL indicate drift of the reference clock frequencies beyond the capture range of Acquisition and Core PLLs and
bits PAH and SAH show entry of Primary and Secondary Acquisition PLLs into Holdover mode. These bits are
described in detail in section 3.2.4. The status pins are enabled when the ZL30402 operates in software control and
they can be used to trigger interrupts.
4.2.3
ZL30402 Register Map
Addresses: 00H to 6FH
Address
hex
Read
Write
Register
Function
00
Control Register 1
R/W
01
Status Register 1
R
04
Control Register 2
R/W
E3DS3/OC3, E3/DS3, 0, 0, 0, 0, 0, 0,
06
Phase Offset Register 2
R/W
0, 0, 0, 0, OffEn, C16POA10, C16POA9, C16POA8
07
Phase Offset Register 1
R/W
C16POA7, C16POA6, C16POA5, C16POA4, C16POA3,
C16POA2, C16POA1, C16POA0
0F
Device ID Register
R
11
Control Register 3
R/W
rsv, rsv, C1.5POA2, C1.5POA1, C1.5POA0, 0, 0, 0
13
Clock Disable Register 1
R/W
0, 0, C16dis, C8dis, C4dis, C2dis, C1.5dis,0
14
Clock Disable Register 2
R/W
0, 0, 0, F8odis, F0odis, F16odis, C6dis, C19dis
19
Core PLL Control Register
R/W
0, 0, 0, 0, 0, 0, MHR, AHRD, 0
1A
Fine Phase Offset Register
R/W
FPOA7, FPOA6, FPOA5, FPOA4, FPOA3, FPOA2, FPOA1,
FPOA0
20
Primary Acquisition PLL Status
Register
R
rsv, rsv, rsv, rsv, InpFreq1, InpFreq0, rsv, PAH,PAFL
28
Secondary Acquisition PLL
Status Register
R
rsv, rsv, rsv, rsv, InpFreq1, InpFreq0, rsv, SAH, SAFL
40
Master Clock Frequency
Calibration Register - Byte 4
R/W
MCFC31, MCFC30, MCFC29, MCFC28, MCFC27, MCFC26,
MCFC25, MCFC24,
41
Master Clock Frequency
Calibration Register - Byte 3
R/W
MCFC23, MCFC22, MCFC21, MCFC20, MCFC19, MCFC18,
MCFC17, MCFC16
42
Master Clock Frequency
Calibration Register - Byte 2
R/W
MCFC15, MCFC14, MCFC13, MCFC12, MCFC11, MCFC10,
MCFC9, MCFC8
43
Master Clock Frequency
Calibration Register - Byte 1
R/W
MCFC7, MCFC6, MCFC5, MCFC4, MCFC3, MCFC2, MCFC1,
MCFC0
RefSel, 0, 0, MS2, MS1, FCS, 0, RefAlign
rsv, rsv, LOCK, HOLDOVER, rsv, FLIM, rsv, rsv
0010 0001
Table 4 - ZL30402 Register Map
Note: The ZL30402 uses address space from 00h to 6Fh. Registers at address locations not listed above must not be written or read.
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ZL30402
4.2.4
Data Sheet
Register Description
Address: 00 H
Bit
Name
Functional Description
Default
7
RefSel
Reference Select. A zero selects the PRI (Primary) reference source
as the input reference signal and a one selects the SEC (secondary)
reference.
0
6-5
RSV
Reserved.
00
4-3
MS2, MS1
2
FCS
Mode Select
- MS2 = 0 MS1 = 0
- MS2 = 0 MS1 = 1
- MS2 = 1 MS1 = 0
- MS2 = 1 MS1 = 1
10
Normal Mode (Locked Mode)
Holdover Mode
Free-run Mode
Reserved
Filter Characteristic Select
0
FCS = 0 Filter corner frequency set to 1.1 Hz. This selection meets
requirements of G.813 Option 1 and GR-1244 stratum 3 clocks.
FCS = 1 Filter corner frequency set to 0.1 Hz. This selection meets
requirements of G.813 Option 2, GR-253 for SONET stratum 3 and
GR-253 for SONET Minimum Clocks (SMC).
1
RSV
0
RefAlign
Reserved.
0
Reference Align. A high-to-low transition aligns the generated output
clocks to the input reference signal. The maximum phase slope
depends on the Filter Characteristic selected and is limited to:
1
- 41ns in 1.326ms for FCS = 0
- 885 ns in 1s for FCS = 1
Table 5 - Control Register 1 (R/W)
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ZL30402
Data Sheet
Address: 01 H
Bit
Name
Functional Description
7
RSV
Reserved.
6
RSV
Reserved.
5
LOCK
4
HOLDOVER
3
RSV
Reserved.
2
FLIM
Frequency Limit. This bit goes high when the Core PLL is pulled by the input
reference signal to the edge of its frequency tracking range set at ±104 ppm. This
bit may change state momentarily in the event of large jitter or wander excursions
occurring when the input reference is close to the frequency limit range.
1
RSV
Reserved.
0
RSV
Reserved.
Lock. This bit goes high when the Core PLL is locked to the selected Acquisition
PLL.
Holdover. This bit goes high when the Core PLL enters Holdover mode. Detection
of reference failure and subsequent transition from Normal to Holdover state takes
approximately: 0.750 µs for 19.44 MHz reference, 0.850 µs for 2.048 MHz
reference, 1.1 µs for 1.544 MHz reference and 130 µs for 8 kHz reference.
Table 6 - Status Register 1 (R)
Address: 04 H
Bit
Name
Functional Description
Default
7
E3DS3/OC3
E3, DS3 or OC-3 clock select. Setting this bit to zero enables the
C155P/N outputs (pin 30 and pin 31) and enables the C34/C44 output
(pin 53) to provide C8 or C11 clocks. Logic high sets the C155 clock
outputs into high impedance and enables the C34/C44 output to
provide a C34 or C44 clock.
0
6
E3/DS3
E3 or DS3 clock select. When E3DS3/OC3 bit is set high, a logic
low on the E3/DS3 bit selects a 44.736 MHz clock on the C34/C44
output and logic high selects a 34.368 MHz clock. When the
E3DS3/OC3 bit is set low, a logic low on the E3/DS3 bit selects an
11.184 MHz clock on the C34/C44 output and a logic high selects
an 8.592 MHz clock.
0
5-0
RSV
Reserved.
000000
Table 7 - Control Register 2 (R/W)
19
Zarlink Semiconductor Inc.
ZL30402
Data Sheet
Address: 06 H
Bit
Name
Functional Description
7-4
RSV
Reserved.
3
OffEn
Offset Enable. Set high to enable programmable phase offset
adjustments (C16 Phase Offset Adjustment and C1.5 Phase Offset
Adjustment) between the input reference and the generated clocks.
2-0
C16POA10
to
C16POA8
Default
0000
0
000
C16 Phase Offset Adjustment. These three bits (most significant) in
conjunction with the eight bits of Phase Offset Register 1 allow for
phase shifting of all clocks and frame pulses that are derived from the
C16 clock (C8o, C4o, C2o, F16o, F8o, F0o). The phase offset is an
unsigned number in a range from 0 to 2047. Each increment by one
represents phase-offset advancement by 61.035 ns with respect to
the input reference signal. The phase offset is a two-byte value and it
must be written in one step increments. For example: four writes are
required to advance clocks by 244 ns from its current position of 22H:
write 23H, 24H, 25H, 26H. Writing numbers in reverse order will delay
clocks from their present position.
Table 8 - Phase Offset Register 2 (R/W)
Address: 07 H
Bit
Name
Functional Description
Default
7-0
C16POA7
to
C16POA0
C16 Phase Offset Adjustment. The eight least significant bits of the
phase offset adjustment word. See the Phase Offset Register 2 for
details.
0000
0000
Table 9 - Phase Offset Register 1 (R/W)
Address: 0F H
Bit
Name
Functional Description
7-4
ID7 - 4
Device Identification Number. These four bits represent the device part number.
The ID number for ZL30402 is 0010.
3-0
ID3 - 0
Device Revision Number. These bits represent the revision number. Number
starts from 0001.
Table 10 - Device ID Register (R)
20
Zarlink Semiconductor Inc.
ZL30402
Data Sheet
Address: 11 H
Bit
Name
Functional Description
Default
7
RSV
Reserved.
0
6
RSV
Reserved.
0
5-3
C1.5POA2
to
C1.5POA0
2-0
RSV
C1.5 Phase Offset Adjustment. These three bits allow for changing of
the phase offset of the C1.5o clock relative to the active input reference.
The phase offset is an unsigned number in a range from 0 to 7. Each
increment by one represents phase-offset advancement by 80.96 ns.
Example: Writing 010 advances C1.5 clock by 162 ns. Successive writing
of 001 delays this clock by 80.96 ns from its present position
000
Reserved.
000
Table 11 - Control Register 3 (R/W)
Address: 13 H
Bit
Name
Functional Description
7
RSV
Reserved.
0
6
RSV
Reserved.
0
5
C16dis
16.384 MHz Clock Disable. When set high, this bit tristates the 16.384 MHz clock
output.
0
4
C8dis
8.192 MHz Clock Disable. When set high, this bit tristates the 8.192 MHz clock
output.
0
3
C4dis
4.096 MHz Clock Disable. When set high, this bit tristates the 4.096 MHz clock
output.
0
2
C2dis
2.048 MHz Clock Disable. When set high, this bit tristates the 2.048 MHz clock
output.
0
1
C1.5dis
1.544 MHz Clock Disable. When set high, this bit tristates the 1.544 MHz clock
output.
0
0
RSV
Reserved.
0
Table 12 - Clock Disable Register 1 (R/W)
21
Zarlink Semiconductor Inc.
Default
ZL30402
Data Sheet
Address: 14 H
Bit
Name
Functional Description
7-5
RSV
4
F8odis
F8o Frame Pulse Disable. When set high, this bit tristates the 8 kHz 122 ns
active high framing pulse output.
0
3
F0odis
F0o Frame Pulse Disable. When set high, this bit tristates the 8 kHz 244 ns
active low framing pulse output.
0
2
F16odis
F16o Frame Pulse Disable. When set high, this bit tristates the 8 kHz 61 ns
active low framing pulse output.
0
1
C6dis
6.312 MHz Clock Disable. When set high, this bit tristates the 6.312 MHz clock
output.
0
0
C19dis
19.44 MHz Clock Disable. When set high, this bit tristates the 19.44 MHz clock
output.
0
Reserved.
Default
000
Table 13 - Clock Disable Register 2 (R/W)
Address: 19 H
Bit
Name
Functional Description
Default
7-3
RSV
Reserved.
2
MHR
Manual Holdover Release. A change form 0 to 1 on the MHR bit will release the Core
PLL from Auto Holdover to Normal when automatic return from Holdover is disabled
(AHRD is set to 1). This bit is level sensitive and it must be cleared immediately after it
is set to 1 (next write operation). This bit has no effect if AHRD is set to 0.
0
1
AHRD
Automatic Holdover Return Disable. When set high, this bit inhibits the Core PLL
from automatically switching back to Normal mode from Auto Holdover state when the
active Acquisition PLL regains lock to input reference. The active Acquisition PLL is the
Acquisition PLL to which the Core PLL is currently connected.
0
0
RSV
Reserved.
0
00000
Table 14 - Core PLL Control Register (R/W)
22
Zarlink Semiconductor Inc.
ZL30402
Data Sheet
Address: 1A H
Bit
Name
Functional Description
Default
7-0
FPOA7 - 0
Fine Phase Offset Adjustment. This register allows phase offset adjustment of
all output clocks and frame pulses (C16o, C8o, C4o, C2o, F16o, F8o, F0o, C155,
C19o, C34/44, C1.5o, C6o) relative to the active input reference. The adjustment
can be positive (advance) or negative (delay) with a nominal step size of 477 ps
(61.035 ns / 128). The rate of phase change is limited to 885 ns/s for FCS = 1 and
41 ns in 1.326 ms for FCS = 0 selections. The phase offset value is a signed 2’s
complement number e.g.:
Advance: +1 step = 01H, +2 steps = 02H, +127 steps = EFH
Delay: -1 step = FFH, -2 steps = FEH, -128 steps = 80H
Example: Writing 08H advances all clocks by 3.8 ns and writing F3H delays all
clocks
00000
000
Table 15 - Fine Phase Offset Register (R/W)
Address: 20 H
Bit
Name
Functional Description
7-5
RSV
4-3
InpFreq10
2
RSV
Reserved.
1
PAH
Primary Acquisition PLL Holdover. This bit goes high whenever the Acquisition PLL
enters Holdover mode. Holdover mode is entered when the reference frequency is
- lost completely
- drifts more than ±30 000 ppm off from the nominal frequency
- a large phase hit occurs on the reference clock.
0
PAFL
Primary Acquisition PLL Frequency Limit. This bit goes high whenever the Acquisition
PLL exceeds its capture range of ±104 ppm. This bit can flicker high in the event of a large
excursion of still tolerable input jitter.
Reserved.
Input Frequency. These two bits identify the Primary Reference Clock frequency.
- 00 = 19.44 MHz
- 01 = 8 kHz
- 10 = 1.544 MHz
- 11 = 2.048 MHz
Table 16 - Primary Acquisition PLL Status Register (R)
23
Zarlink Semiconductor Inc.
ZL30402
Data Sheet
Address: 28 H
Bit
Name
Functional Description
7-5
RSV
4-3
InpFreq1-0
2
RSV
Reserved.
1
SAH
Secondary Acquisition PLL Holdover. This bit goes high whenever the Acquisition PLL
enters Holdover mode. Holdover mode is entered when reference frequency is:
- lost completely
- drifts more than ±30 000 ppm off the nominal frequency
- a large phase hit occurs on the reference clock.
0
SAFL
Secondary Acquisition PLL Frequency Limit. This bit goes high whenever the Acquisition
PLL exceeds its capture range of ±104 ppm. This bit can flicker high in the event of a large
excursion of still tolerable input jitter.
Reserved.
Input Frequency. These two bits identify the Secondary Reference Clock frequency.
- 00 = 19.44 MHz
- 01 = 8 kHz
- 10 = 1.544 MHz
- 11 = 2.048 MHz
Table 17 - Secondary Acquisition PLL Status Register (R)
Address: 40 H
Bit
Name
Functional Description
Default
7-0
MCFC31 - 24
Master Clock Frequency Calibration. This most significant byte contains the
31st to 24th bit of the Master Clock Frequency Calibration Register. See
Applications section 4.2 for a detailed description of how to calculate the MCFC
value.
00000
000
Table 18 - Master Clock Frequency Calibration Register 4 (R/W)
Address: 41 H
Bit
7-0
Name
MCFC23 - 16
Functional Description
Default
Master Clock Frequency Calibration. This byte contains the 23rd
to 16th bit of the Master Clock Frequency Calibration Register.
00000
000
Table 19 - Master Clock Frequency Calibration Register 3 (R/W)
Address: 42 H
Bit
Name
Functional Description
Default
7-0
MCFC15 - 8
Master Clock Frequency Calibration. This byte contains the 15th
to 8th bit of the Master Clock Frequency Calibration Register.
00000
000
Table 20 - Master Clock Frequency Calibration Register 2 (R/W)
24
Zarlink Semiconductor Inc.
ZL30402
Data Sheet
Address: 43 H
Bit
Name
Functional Description
7-0
MCFC7 - 0
Default
Master Clock Frequency Calibration. This byte contains bit 7 to
bit 0 of the Master Clock Frequency Calibration Register.
00000
000
Table 21 - Master Clock Frequency Calibration Register 1 (R/W)
5.0
Applications
This section contains application specific details for Mode Switching and Master Clock Oscillator calibration.
5.1
ZL30402 Mode Switching - Examples
The ZL30402 is designed to transition from one mode to the other driven by the internal State Machine or by
manual control. The following examples present a couple of typical scenarios of how the ZL30402 can be employed
in network synchronization equipment (e.g., timing modules, line cards or stand alone synchronizers).
5.1.1
System Start-up Sequence: FREE-RUN --> HOLDOVER --> NORMAL
The FREE-RUN to HOLDOVER to NORMAL transition represents a sequence of steps that will most likely occur
during a new system installation or scheduled maintenance of timing cards. The process starts from the RESET
state and then transitions to Free-run mode where the system (card) is being initialized. At the end of this process
the ZL30402 should be switched into Normal mode (with MS2, MS1 set to 00) instead of Holdover mode. If the
reference clock is available, the ZL30402 will transition briefly into Holdover to acquire synchronization and switch
automatically to Normal mode. If the reference clock is not available at this time, as it may happen during new
system installation, then the ZL30402 will stay in Holdover indefinitely. While in Holdover mode, the Core PLL will
continue generating clocks with the same accuracy as in the Free-run mode, waiting for a good reference clock.
When the system is connected to the network (or timing card switched to a valid reference) the Acquisition PLL will
quickly synchronize and clear its own Holdover status (PAH bit). This will enable the Core PLL to start the
synchronization process. After acquiring lock, the ZL30402 will automatically switch from Holdover into Normal
mode without system intervention. This transition to the Normal mode will be flagged by the LOCK status bit and
pin.
MS2, MS1 == 01 OR
RefSel change
RESET == 1
RESET
Ref: OK &
MS2, MS1 == 00
{AUTO}
MS2, MS1! = 10
FREERUN
10
HOLDOVER
01
Ref: FAIL --> OK &
MS2, MS1 == 00 &
AHRD=1 &
MHR= 0 -->1 then 1-->0
{MANUAL}
NORMAL
(LOCKED)
00
Ref: OK --> FAIL &
MS2, MS1 == 00
{AUTO}
RefSel Change
AUTO
HOLDOVER
MS2, MS1 == 10 forces
unconditional return from
any state to Free-run
Figure 7 - Transition from Free-Run to Normal Mode
25
Zarlink Semiconductor Inc.
Ref: FAIL --> OK &
MS2, MS1 == 00 &
AHRD=0
{AUTO}
ZL30402
5.1.2
Data Sheet
Single Reference Operation: NORMAL --> AUTO HOLDOVER --> NORMAL
The NORMAL to AUTO-HOLDOVER to NORMAL transition will usually happen when the Network Element loses
its single reference clock unexpectedly or when it has two references but switching to the secondary reference is
not a desirable option (unless primary reference is lost without chance of quick recovery).
The sequence starts with the unexpected failure of a reference signal shown as transition OK --> FAIL in Figure 7
"Transition from Free-Run to Normal Mode" at a time when ZL30402 operates in Normal mode. This failure is
detected by the active Acquisition PLL based on the following FAIL criteria:
•
Frequency offset on 8 kHz, 1.544 MHz, 2.048 MHz and 19.44 MHz reference clocks exceeds ±30000 ppm
(±3%).
•
Single phase hit on 1.544 MHz, 2.048 MHz and 19.44 MHz exceeds half of the cycle of the reference clock.
After detecting any of these anomalies on a reference clock the Acquisition PLL will switch itself into Holdover mode
forcing the Core PLL to automatically switch into the Auto Holdover state. This condition is flagged by LOCK = 0
and HOLDOVER = 1.
MS2, MS1 == 01 OR
RefSel change
Ref: OK &
MS2, MS1 == 00
{AUTO}
RESET == 1
RESET
MS2, MS1! = 10
FREERUN
10
MS2, MS1 == 10 forces
unconditional return from
any state to Free-run
HOLDOVER
01
Ref: FAIL --> OK &
MS2, MS1 == 00 &
AHRD=1 &
MHR=0 -->1 then 1-->0
{MANUAL}
NORMAL
(LOCKED)
00
Ref: OK --> FAIL &
MS2, MS1 == 00
{AUTO}
RefSel Change
Ref: FAIL --> OK &
MS2, MS1 == 00 &
AHRD=0
{AUTO}
AUTO
HOLDOVER
Automatic return to NORMAL: AHRD=0
OR
Manual return to NORMAL: AHRD=1 & MHR= 0-->1 then 1-->0
Figure 8 - Automatic Entry into Auto Holdover State and Eecovery into Normal mode
There are two possible returns to Normal mode after the reference signal is restored:
•
With the AHRD (Automatic Holdover Return Disable) bit set to 0. In this case the Core PLL will automatically
return to the Normal state after the reference signal recovers from failure. This transition is shown on the
state diagram as a FAIL --> OK change. This change becomes effective when the reference is restored and
there have been no phase hits detected for at least 64 clock cycles for 1.544/2.048 MHz reference, 512
clock cycles for 19.44 MHz reference and 1 clock cycle for 8 kHz reference.
•
With the AHRD bit set to high to disable automatic return to Normal and the change of MHR (Manual
Holdover Release) bit from 0 to 1 to trigger the transition from Auto Holdover to Normal. This option is
provided to protect the Core PLL against toggling between Normal and Auto Holdover states in case of an
intermittent quality reference clock. In the case when MHR has been changed when the reference is still not
available (Acquisition PLL in Holdover mode) the transition to Normal state will not occur and MHR 0 to 1
transition must be repeated.
This transition from Auto Holdover to Normal mode is performed as “hitless” reference switching.
26
Zarlink Semiconductor Inc.
ZL30402
5.1.3
Data Sheet
Dual Reference Operation: NORMAL --> AUTO HOLDOVER--> HOLDOVER --> NORMAL
The NORMAL to AUTO-HOLDOVER to HOLDOVER to NORMAL sequence represents the most likely operation of
ZL30402 in Network Equipment.
The sequence starts from the Normal state and transitions to Auto Holdover state due to an unforeseen loss of
reference. The failure conditions triggering this transition were described in section 4.1.2. When in the Auto
Holdover state, the ZL30402 can return to Normal mode automatically if the lost reference is restored and the
ADHR bit is set to 0. If the reference clock failure persists for a period of time that exceeds the system design limit,
the system control processor may initiate a reference switch. If the secondary reference is available the ZL30402
will briefly switch into Holdover mode and then transition to Normal mode.
MS2, MS1 == 01 OR
RefSel change
RESET == 1
RESET
Ref: OK &
MS2, MS1 == 00
{AUTO}
MS2, MS1! = 10
FREERUN
10
HOLDOVER
01
Ref: FAIL --> OK &
MS2, MS1 == 00 &
AHRD=1 &
MHR= 0-->1 then 1-->0
{MANUAL}
NORMAL
(LOCKED)
00
Ref: OK --> FAIL &
MS2, MS1 == 00
{AUTO}
RefSel Change
Ref: FAIL --> OK &
MS2, MS1 == 00 &
AHRD=0
{AUTO}
AUTO
HOLDOVER
AHRD=0
(automatic return enabled)
MS2, MS1 == 10 forces
unconditional return from
any state to Free-run
Figure 9 - Entry into Auto Holdover state and recovery into Normal mode by switching
references
The new reference clock will most likely have a different phase but it may also have a different fractional frequency
offset. In order to lock to a new reference with a different frequency, the Core PLL may be stepped gradually
towards the new frequency. The frequency slope will be limited to less than 2.0 ppm/sec.
27
Zarlink Semiconductor Inc.
ZL30402
5.1.4
Data Sheet
Reference Switching (RefSel): NORMAL --> HOLDOVER --> NORMAL
The NORMAL to HOLDOVER to NORMAL mode switching is usually performed when:
•
A reference clock is available but its frequency drifts beyond some specified limit. In a Network Element with
stratum 3 internal clocks, the reference failure is declared when its frequency drifts more than ±12 ppm
beyond its nominal frequency.
•
During routine maintenance of equipment when orderly switching of reference clocks is possible. This may
happen when synchronization references must be rearranged or when a faulty line card must be replaced.
MS2, MS1 == 01 OR
RefSel change
Ref: OK &
MS2, MS1 == 00
{AUTO}
RESET == 1
RESET
MS2, MS1! = 10
FREERUN
10
HOLDOVER
01
Ref: FAIL --> OK &
MS2, MS1 == 00 &
AHRD=1 &
MHR= 0-->1 then 1-->0
{MANUAL}
NORMAL
(LOCKED)
00
Ref: OK --> FAIL &
MS2, MS1 == 00
{AUTO}
RefSel Change
Ref: FAIL --> OK &
MS2, MS1 == 00 &
AHRD=0
{AUTO}
AUTO
HOLDOVER
MS2, MS1 == 10 forces
unconditional return from
any state to Free-run
Figure 10 - Manual Reference Switching
Two types of transitions are possible:
•
Semi-automatic transition, which involves changing RefSel input to select a secondary reference clock
without changing the mode select inputs MS2, MS1 = 00 (Normal mode). This forces ZL30402 to
momentarily transition through the Holdover state and automatically return to Normal mode after
synchronizing to a secondary reference clock.
•
Manual transition, which involves switching into Holdover mode (MS2, MS1 = 01), changing references with
RefSel, and manual return to the Normal mode (MS2, MS1 = 00).
In both cases, the change of references provides “hitless” switching.
5.2
Programming Master Clock Oscillator Frequency Calibration Register
The Master Crystal Oscillator and its programmable Master Clock Frequency Calibration register (see Table 18,
Table 19, Table 20, and Table 21) have been described in Section 3.0 "Master Clock Frequency Calibration Circuit",
on page 13. Programming of this register should be done after system has been powered long enough for the
Master Crystal Oscillator to reach a steady operating temperature. When the temperature stabilizes the crystal
oscillator frequency should be measured with an accurate frequency meter. The frequency measurement should be
substituted for the foffset variable in the following equation.
MCFC = 45036 * ( - foffset)
where foffset is the crystal oscillator frequency offset from the nominal 20 000 000 Hz frequency expressed in Hz.
28
Zarlink Semiconductor Inc.
ZL30402
Data Sheet
Example 1: Calculate the binary value that must be written to the MCFC register to correct a -1ppm offset of the
Master Crystal Oscillator. The -1ppm offset for a 20 MHz frequency is equivalent to -20 Hz:
MCFC = 45036 * 20 = 900720 = 00 0D BE 70 H
Note: Correcting the -1ppm crystal offset requires +1ppm MCFC offset.
Example 2: Calculate the binary value that must be written to the MCFC register to correct a +2 ppm offset of the
Master Crystal Oscillator. The +2 ppm offset for 20 MHz frequency is equivalent to 40 Hz:
MCFC = 45036 * (-40) = -1801440 = FF E4 83 20 H
6.0
Characteristics
6.1
AC and DC Electrical Characteristics
Absolute Maximum Ratings*
Parameter
Symbol
Min.
Max.
Units
1
Supply voltage
VDDR
-0.3
7.0
V
2
Voltage on any pin
VPIN
-0.3
VDD+0.3
V
3
Current on any pin
IPIN
30
mA
4
Storage temperature
TST
125
°C
5
Package power dissipation (80 pin LQFP)
PPD
1000
mW
6
ESD rating
VESD
1500
V
-55
* Voltages are with respect to ground (GND) unless otherwise stated
* Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied.
Recommended Operating Conditions*
Characteristics
1
Supply voltage
2
Operating temperature
Symbol
Min.
Typ.
Max.
Units
VDD
3.0
3.3
3.6
V
TA
-40
25
+85
°C
* Voltages are with respect to ground (GND) unless otherwise stated
29
Zarlink Semiconductor Inc.
ZL30402
Data Sheet
DC Electrical Characteristics*
Characteristics
Symbol
Min.
Max.
Units
Notes
1
Supply current with C20i = 20 MHz
IDD
135
mA
Outputs unloaded
2
Supply current with C20i = 0V
IDDS
2.2
mA
Outputs unloaded
3
CMOS high-level input voltage
VCIH
4
CMOS low-level input voltage
VCIL
0.3VDD
V
5
Input leakage current
IIL
15
µA
VI=VDD or GND
6
High-level output voltage
VOH
V
IOH=10 mA
7
Low-level output voltage
VOL
0.4
V
IOL=10 mA
8
LVDS: Differential output voltage
VOD
450
mV
ZT=100 Ω
9
LVDS: Change in VOD between
complementary output states
dVOD
50
mV
ZT=100 Ω
10
LVDS: Offset voltage
VOS
1.375
V
11
LVDS: Change in VOS between
complementary output states
dVOS
50
mV
12
LVDS: Output short circuit current
IOS
24
mA
Pin short to GND
13
LVDS: Output rise and fall times
TRF
900
ps
Note 2
0.7VDD
V
2.4
250
1.125
260
Note 1
* Voltages are with respect to ground (GND) unless otherwise stated
Note 1:
Note 2:
V OS is defined as (V OH + V OL) / 2
Rise and fall times are measured at 20% and 80% levels.
AC Electrical Characteristics - Timing Parameter Measurement - CMOS Voltage Levels*
Characteristics
Symbol
Level
Units
VT
0.5VDD
V
1
Threshold voltage
2
Rise and fall threshold voltage High
VHM
0.7VDD
V
3
Rise and fall threshold voltage Low
VLM
0.3VDD
V
* Voltages are with respect to ground (GND) unless otherwise stated
* Supply voltage and operating temperature are as per Recommended Operating Conditions
* Timing for input and output signals is based on the worst case conditions (over TA and VDD)
Timing Reference Points
VHM
VT
ALL SIGNALS
VLM
tIF, tOF
tIR, tOR
Figure 11 - Timing Parameters Measurement Voltage Levels
30
Zarlink Semiconductor Inc.
ZL30402
Data Sheet
AC Electrical Characteristics - Microprocessor Timing*
Characteristics
Symbol
Min.
Max.
Units
1
DS Low
tDSL
65
ns
2
DS High
tDSH
100
ns
3
CS Setup
tCSS
0
ns
4
CS-Hold
tCSH
0
ns
5
R/W Setup
tRWS
20
ns
6
R/W Hold
tRWH
5
ns
7
Address Setup
tADS
10
ns
8
Address Hold
tADH
10
ns
9
Data Read Delay
tDRD
60
ns
10
Data Read Hold
tDRH
10
ns
11
Data Write Setup
tDWS
10
ns
12
Data Write Hold
tDWH
5
ns
Notes
CL=90 pF
* Supply voltage and operating temperature are as per Recommended Operating Conditions
tDSL
tDSH
VT
DS
tCSH
tCSS
CS
VT
tRWH
tRWS
VT
R/W
tADH
tADS
VT
A0-A6
tDRH
tDRD
VALID DATA
D0-D7
READ
tDWH
tDWS
D0-D7
WRITE
VT
VALID DATA
VT
Figure 12 - Microport Timing
31
Zarlink Semiconductor Inc.
ZL30402
Data Sheet
AC Electrical Characteristics - ST-BUS and GCI Output Timing*
Characteristics
Symbol
Min.
Max.
Units
1
F16o pulse width low (nom 61ns)
tF16L
52
61
ns
2
F8o to F16o delay
tF16D
19
27
ns
3
C16o pulse width low
tC16L
19
35
ns
4
C16o to F8o delay
tC16D
-2
6
ns
5
F8o pulse width high (nom 122 ns)
tF8H
118
128
ns
6
C8o pulse width low
tC8L
54
65
ns
7
C8o to F8o delay
tC8D
-2
6
ns
8
F0o pulse width low (nom 244)
tF0L
236
248
ns
9
F8o to F0o delay
tF0D
115
123
ns
10
C4o pulse width low
tC4L
114
126
ns
11
C4o to F8o delay
tC4D
2
8
ns
12
C2o pulse width low
tC2L
235
250
ns
13
C2o to F8o delay
tC2D
-2
6
ns
Notes
* Supply voltage and operating temperature are as per Recommended Operating Conditions
tF16L
tF16D
F16o
VT
tc =125µs
tC16L
tC16D
VT
C16o
tF8H
tc = 61.04 ns
VT
F8o
tc =125µs
tC8L
tC8D
C8o
VT
tF0L
tc = 122.07 ns
F0o
tF0D
tc =125µs
VT
tC4L
tC4D
C4o
VT
tc = 244.14 ns
tC2L
tC2D
C2o
VT
tc = 488.28 ns
Figure 13 - ST-BUS and GCI Output Timing
32
Zarlink Semiconductor Inc.
ZL30402
Data Sheet
AC Electrical Characteristics - DS1, DS2 and C19o Clock Timing*
Characteristics
Symbol
Min.
Max.
Units
1
C6o pulse width low
tC6L
70
83
ns
2
F8o to C6o delay
tC6D
80
95
ns
3
C1.5o pulse width low
tC1.5L
315
330
ns
4
C1.5o to F8o delay
tC1.5D
55
75
ns
5
C19o pulse width high
tC19H
19
35
ns
6
C19o to F8o delay
tC19D
8
14
ns
Notes
* Supply voltage and operating temperature are as per Recommended Operating Conditions
VT
F8o
tC6D
tC6L
tc =125µs
VT
C6o
tc = 158.43 ns
tC1.5L
tC1.5D
C1.5o
VT
tc = 647.67 ns
tC19H
tC19D
C19o
VT
tc = 51.44 ns
Figure 14 - DS1, DS2 and C19o Clock Timing
33
Zarlink Semiconductor Inc.
ZL30402
Data Sheet
AC Electrical Characteristics - C155o and C19o Clock Timing
Characteristics
Symbol
Min.
Max.
Units
tC155L
2.7
3.7
ns
1
C155o pulse width low
2
C155o to C19o rising edge delay
tCF19DLH
-10
5
ns
3
C155o to C19o falling edge delay
tCF19DHL
-7
7
ns
4
C19 pulse width high
tCF19H
22
33
Notes
* Supply voltage and operating temperature are as per Recommended Operating Conditions
tC155L
1
2
3
4
5
6
7
C155p
8
1
1.25V
tc = 6.43 ns
tCF19DLH
tCF19DHL
VT
C19o
Dejittered
tc = 51.44 ns
tCF19H
Note: Delay is measured from the rising edge of C155P clock (single ended) at 1.25V threshold
to the rising and falling edges of C19o clock at VT threshold
Figure 15 - C155o and C19o Timing
34
Zarlink Semiconductor Inc.
ZL30402
Data Sheet
AC Electrical Characteristics - Input to Output Phase Alignment (after RefAlign change from 1 to 0)*
Characteristics
Symbol
Min.
Max.
Units
1
8 kHz ref pulse width high
tR8H
100
2
F8o to 8 kHz ref input delay
tR8D
-15
3
1.544 MHz ref pulse width high
tR1.5H
100
4
1.544 MHz ref input to F8o delay
tR1.5D
210
5
2.048 MHz ref pulse width high
tR2H
100
6
2.048 MHz ref input to F8o delay
tR2D
192
7
19.44 MHz ref pulse width high
tR19H
20
8
F8o to 19.44 MHz ref input delay
tR19D
5
14
ns
9
19.44 MHz ref input to C19o delay
tR19C19D
-4
4
ns
10
Reference input rise and fall time
tIR, tIF
10
ns
Notes
ns
115
ns
Note 1
ns
220
ns
ns
202
ns
ns
* Supply voltage and operating temperature are as per Recommended Operating Conditions
Note 1: For 8 kHz reference alignment refer to Application Note ZL-27 "Phase Alignment between 8 kHz Output and 8 kHz Input Reference on
ZL30402"
tR8H
tR8D
PRI/SEC
8 kHz
VT
tc = 125 µs
PRI/SEC
1.544 MHz
tR2H
tR2D
VT
tc = 488.28 ns
tR19H
PRI/SEC
19.44 MHz
tR1.5D
VT
tc = 647.67 ns
PRI/SEC
2.048 MHz
tR1.5H
tR19D
VT
tc = 51.44 ns
tR19C19D
C19o
VT
tc = 51.44 ns
VT
F8o
tc = 125 µs
Note: Delay time measurements are done with jitter free input reference signals
Figure 16 - Input Reference to Output Clock Phase Alignment
35
Zarlink Semiconductor Inc.
ZL30402
Data Sheet
AC Electrical Characteristics - Input Control Signals*
Characteristics
Symbol
Min.
Max.
Units
1
Input controls Setup time
tS
100
ns
2
Input controls Hold time
tH
100
ns
Notes
* Supply voltage and operating temperature are as per Recommended Operating Conditions.
VT
F8o
tH
tS
MS1, MS2
RefSel, FCS,
RefAlign
E3/DS3, E3DS3/OC3
VT
Figure 17 - Input Control Signal Setup and Hold Time
AC Electrical Characteristics - E3 and DS3 Output Timing*
Characteristics
Symbol
Min.
Max.
Units
1
C44o clock pulse width high
tC44H
8
12
ns
2
C11o clock pulse width high
tC11H
8
40
ns
3
C34o clock pulse width high
tC34H
12
15
ns
4
C8.5o clock pulse width high
tC8.5L
7
40
ns
Notes
* Supply voltage and operating temperature are as per Recommended Operating Conditions
tC44H
VT
C44o
tc = 22.35 ns
tC11H
C11o
VT
tc = 89.41 ns
tC34H
VT
C34o
tc = 29.10 ns
tC8.5H
VT
C8.5o
tc = 116.39 ns
Figure 18 - E3 and DS3 Output Timing
36
Zarlink Semiconductor Inc.
ZL30402
6.2
Data Sheet
Performance Characteristics
Performance Characteristics*
Characteristics
1
Holdover accuracy
2
Holdover stability
3
Capture range
Typical
Units
0.000001
ppm
NA
ppm
±104
ppm
Notes
Determined by stability of
20MHz frequency source
Lock time
4
1.1Hz Filter
70
s
±4.6ppm frequency offset
5
0.1Hz Filter
70
s
±4.6ppm frequency offset
Output Phase variation
6
Reference switching:
PRI ⇐ SEC, SEC ⇐ PRI
50
ns
7
Switching from Normal mode to Holdover
mode
0
ns
8
Switching from Holdover mode to Normal
mode
50
ns
Output Phase Slope
9
G.813 Option 1, GR-1244 stratum 3
41
1.326ms
10
G.813 Option 2
GR-253 SONET stratum 3
GR-253 SONET SMC
885
ns/s
* Supply voltage and operating temperature are as per Recommended Operating Conditions.
37
Zarlink Semiconductor Inc.
ZL30402
Data Sheet
Performance Characteristics - Jitter Generation (Intrinsic Jitter) - Filtered*
Characteristics
Max
Ulpp
Max
ns-pp
Notes
1
C1.5o (1.544 MHz)
0.004
2.75
Filter: 10 Hz - 40 kHz
2
C2o (2.048 MHz)
0.004
1.80
Filter: 20 Hz - 100 kHz
3
C19o (19.44 MHz) Dejittered
0.017
0.86
Filter: 100 Hz - 400 kHz OC-1
4
C19o (19.44 MHz) Dejittered
0.014
0.73
Filter: 20 kHz - 400 kHz OC-1
5
C19o (19.44 MHz) Dejittered
0.024
1.24
Filter: 500 Hz - 1.3 MHz OC-3
6
C19o (19.44 MHz) Dejittered
0.021
1.08
Filter: 65 kHz - 1.3 MHz OC-3
7
C19o (19.44 MHz)
0.026
1.34
Filter: 100 Hz - 400 kHz OC-1
8
C19o (19.44 MHz)
0.018
0.94
Filter: 20 kHz - 400 kHz OC-1
9
C19o (19.44 MHz)
0.035
1.78
Filter: 500 Hz - 1.3 MHz OC-3
10
C19o (19.44 MHz)
0.025
1.30
Filter: 65 kHz - 1.3 MHz OC-3
11
C34o (34.368 MHz)
0.038
1.11
Filter: 100 Hz - 800 kHz
12
C34o (34.368 MHz)
0.037
1.06
Filter: 10 kHz - 800 kHz
13
C44o (44.736 MHz)
0.032
0.72
Filter: 10 Hz - 400 kHz
14
C44o (44.736 MHz)
0.023
0.51
Filter: 30 kHz - 400 kHz
15
C155o (155.52 MHz)
0.106
0.68
Filter: 100 Hz - 400 kHz OC-1
16
C155o (155.52 MHz)
0.091
0.58
Filter: 20 kHz - 400 kHz OC-1
17
C155o (155.52 MHz)
0.145
0.93
Filter: 500 Hz - 1.3 MHz OC-3
18
C155o (155.52 MHz)
0.127
0.82
Filter: 65 kHz - 1.3 MHz OC-3
* Supply voltage and operating temperature are as per Recommended Operating Conditions.
38
Zarlink Semiconductor Inc.
ZL30402
Data Sheet
Performance Characteristics - Jitter Generation (Intrinsic Jitter) - Unfiltered*
Characteristics
Max Ulpp
Max ns-pp
Notes
1
C1.5o (1.544 MHz)
0.010
6.5
2
C2o (2.048 MHz)
0.010
5.8
3
C4o- (4.096 MHz)
0.020
4.8
4
C6o (6.312 MHz)
0.033
5.2
5
C8o (8.192 MHz)
0.042
5.2
6
C8.5o (8.592 MHz)
0.028
3.3
7
C11o (11.184 MHz)
0.031
2.8
8
C16o- (16.384 MHz)
0.090
5.5
9
C19o (19.44 MHz)
0.038
2.0
Dejittered with Analog PLL
10
C19o (19.44 MHz)
0.059
3.0
Analog PLL bypassed
11
C34o (34.368 MHz)
0.092
2.7
12
C44o (44.736 MHz)
0.110
2.5
13
C155o (155.52 MHz)
0.170
1.1
14
F0o (8 kHz)
NA
4.7
15
F8o (8 kHz)
NA
4.0
16
F16o (8 kHz)
NA
3.1
* Supply voltage and operating temperature are as per Recommended Operating Conditions.
39
Zarlink Semiconductor Inc.
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