DS3251/DS3252/DS3253/DS3254
Single/Dual/Triple/Quad
DS3/E3/STS-1 LIUs
www.maxim-ic.com
GENERAL DESCRIPTION
The DS3251 (single), DS3252 (dual), DS3253
(triple), and DS3254 (quad) line interface units (LIUs)
perform the functions necessary for interfacing at the
physical layer to DS3, E3, or STS-1 lines. Each LIU
has independent receive and transmit paths and a
built-in jitter attenuator. An on-chip clock adapter
generates all line-rate clocks from a single input
clock. Control interface options include 8-bit parallel,
SPI, and hardware mode.
FEATURES
Pin-Compatible Family of Products
Each Port Independently Configurable
Receive Clock and Data Recovery for Up to 380
meters (DS3), 440 meters (E3), or 360 meters
(STS-1) of 75Ω Coaxial Cable
Standards-Compliant Transmit Waveshaping
Three Control Interface Options: 8-Bit Parallel,
SPI, and Hardware Mode
Built-In Jitter Attenuators can be Placed in Either
the Receive or Transmit Paths
Jitter Attenuators Have Provisionable Buffer
Depth: 16, 32, 64, or 128 Bits
Built-In Clock Adapter Generates All Line-Rate
Clocks from a Single Input Clock (DS3, E3,
STS-1, OC-3, 19.44MHz, 38.88MHz,
77.76MHz)
B3ZS/HDB3 Encoding and Decoding
Minimal External Components Required
Local and Remote Loopbacks
Low-Power 3.3V Operation (5V Tolerant I/O)
Industrial Temperature Range: -40°C to +85°C
Small Package: 144-Pin, 13mm x 13mm
Thermally Enhanced CSBGA
Drop-In Replacement for DS3151/52/53/54 LIUs
IEEE 1149.1 JTAG Support
Features continued on page 5.
APPLICATIONS
SONET/SDH and PDH Multiplexers
Digital Cross-Connects
Access Concentrators
ATM and Frame Relay Equipment
Routers
PBXs
DSLAMs
CSU/DSUs
FUNCTIONAL DIAGRAM
EACH LIU
LINE IN
DS3, E3,
OR STS-1
RXP
RXN
CLK
DATA
RECEIVE
CLOCK
AND DATA
CONTROL
STATUS
TRANSMIT
CLOCK
AND DATA
Dallas
Semiconductor
DS325x
ORDERING INFORMATION
PART
DS3251
DS3251N
DS3252
DS3252N
DS3253
DS3253N
DS3254
DS3254N
LIU
1
1
2
2
3
3
4
4
TEMP RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
144 TE-CSBGA
144 TE-CSBGA
144 TE-CSBGA
144 TE-CSBGA
144 TE-CSBGA
144 TE-CSBGA
144 TE-CSBGA
144 TE-CSBGA
LINE OUT
DS3, E3,
OR STS-1
TXP
TXN
CLK
DATA
Note:
Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here:
www.maxim-ic.com/errata.
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REV: 030106
DS3251/DS3252/DS3253/DS3254
TABLE OF CONTENTS
1.
2.
3.
4.
5.
6.
7.
8.
STANDARDS COMPLIANCE ............................................................................................................6
DETAILED DESCRIPTION ................................................................................................................7
APPLICATION EXAMPLE .................................................................................................................7
BLOCK DIAGRAMS ..........................................................................................................................8
CONTROL INTERFACE MODES ......................................................................................................9
PIN DESCRIPTIONS........................................................................................................................10
REGISTER DESCRIPTIONS ...........................................................................................................15
RECEIVER .......................................................................................................................................24
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
8.9
I
NTERFACING TO THE
L
INE
........................................................................................................................... 24
O
PTIONAL
P
REAMP
..................................................................................................................................... 24
A
UTOMATIC
G
AIN
C
ONTROL
(AGC)
AND
A
DAPTIVE
E
QUALIZER
..................................................................... 24
C
LOCK AND
D
ATA
R
ECOVERY
(CDR)........................................................................................................... 24
L
OSS
-
OF
-S
IGNAL
(LOS) D
ETECTOR
............................................................................................................ 24
F
RAMER
I
NTERFACE
F
ORMAT AND THE
B3ZS/HDB3 D
ECODER
.................................................................... 25
R
ECEIVE
L
INE
-C
ODE
V
IOLATION
C
OUNTER
.................................................................................................. 26
R
ECEIVER
P
OWER
-D
OWN
........................................................................................................................... 26
R
ECEIVER
J
ITTER
T
OLERANCE
.................................................................................................................... 26
T
RANSMIT
C
LOCK
....................................................................................................................................... 27
F
RAMER
I
NTERFACE
F
ORMAT AND THE
B3ZS/HDB3 E
NCODER
.................................................................... 27
P
ATTERN
G
ENERATION
............................................................................................................................... 27
W
AVESHAPING
, L
INE
B
UILD
-O
UT
, L
INE
D
RIVER
............................................................................................ 28
I
NTERFACING TO THE
L
INE
........................................................................................................................... 28
T
RANSMIT
D
RIVER
M
ONITOR
....................................................................................................................... 28
T
RANSMITTER
P
OWER
-D
OWN
...................................................................................................................... 28
T
RANSMITTER
J
ITTER
G
ENERATION
(I
NTRINSIC
) ........................................................................................... 28
T
RANSMITTER
J
ITTER
T
RANSFER
................................................................................................................. 28
9.
TRANSMITTER ................................................................................................................................27
9.1
9.2
9.3
9.4
9.5
9.6
9.7
9.8
9.9
10.
11.
11.1
11.2
JITTER ATTENUATOR................................................................................................................32
DIAGNOSTICS .............................................................................................................................34
PRBS G
ENERATOR AND
D
ETECTOR
............................................................................................................ 34
L
OOPBACKS
............................................................................................................................................... 34
12.
13.
14.
15.
15.1
15.2
CLOCK ADAPTER.......................................................................................................................35
RESET LOGIC .............................................................................................................................35
TRANSFORMERS........................................................................................................................36
CPU INTERFACES ......................................................................................................................37
P
ARALLEL
I
NTERFACE
................................................................................................................................. 37
SPI I
NTERFACE
.......................................................................................................................................... 37
16.
16.1
16.2
16.3
16.4
JTAG TEST ACCESS PORT AND BOUNDARY SCAN .............................................................40
JTAG D
ESCRIPTION
................................................................................................................................... 40
JTAG TAP C
ONTROLLER
S
TATE
M
ACHINE
D
ESCRIPTION
............................................................................. 40
JTAG I
NSTRUCTION
R
EGISTER AND
I
NSTRUCTIONS
...................................................................................... 42
JTAG T
EST
R
EGISTERS
.............................................................................................................................. 43
17.
18.
19.
19.1
ELECTRICAL CHARACTERISTICS............................................................................................44
PIN ASSIGNMENTS.....................................................................................................................56
PACKAGE INFORMATION..........................................................................................................70
144-P
IN
TE-CSBGA (56-G6016-001) ....................................................................................................... 70
20.
21.
THERMAL INFORMATION ..........................................................................................................71
REVISION HISTORY....................................................................................................................71
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DS3251/DS3252/DS3253/DS3254
LIST OF FIGURES
Figure 2-1. External Connections ................................................................................................................................ 7
Figure 3-1. 4-Port Unchannelized DS3/E3 Card ......................................................................................................... 7
Figure 4-1. CPU Bus Mode Block Diagram ................................................................................................................. 8
Figure 4-2. Hardware Mode Block Diagram ................................................................................................................ 9
Figure 7-1. Status Register Logic .............................................................................................................................. 16
Figure 8-1. Receiver Jitter Tolerance ........................................................................................................................ 27
Figure 9-1. E3 Waveform Template........................................................................................................................... 30
Figure 9-2. DS3 AIS Structure ................................................................................................................................... 31
Figure 10-1. Jitter Attenuation/Jitter Transfer ............................................................................................................ 33
Figure 11-1. PRBS Output with Normal RCLK Operation ......................................................................................... 34
Figure 11-2. PRBS Output with Inverted RCLK Operation........................................................................................ 34
Figure 15-1. SPI Clock Polarity and Phase Options.................................................................................................. 38
Figure 15-2. SPI Bus Transactions............................................................................................................................ 39
Figure 16-1. JTAG Block Diagram............................................................................................................................. 41
Figure 16-2. JTAG TAP Controller State Machine .................................................................................................... 42
Figure 17-1. Transmitter Framer Interface Timing Diagram...................................................................................... 46
Figure 17-2. Receiver Framer Interface Timing Diagram .......................................................................................... 46
Figure 17-3. Parallel CPU Interface Timing Diagram (Nonmultiplexed).................................................................... 50
Figure 17-4. Parallel CPU Interface Timing Diagram (Multiplexed) .......................................................................... 52
Figure 17-5. SPI Interface Timing Diagram ............................................................................................................... 54
Figure 17-6. JTAG Timing Diagram........................................................................................................................... 55
Figure 18-1. DS3251 Hardware Mode Pin Assignment............................................................................................. 58
Figure 18-2. DS3251 Parallel Bus Mode Pin Assignment......................................................................................... 59
Figure 18-3. DS3251 SPI Bus Mode Pin Assignment ............................................................................................... 60
Figure 18-4. DS3252 Hardware Mode Pin Assignment............................................................................................. 61
Figure 18-5. DS3252 Parallel Bus Mode Pin Assignment......................................................................................... 62
Figure 18-6. DS3252 SPI Bus Mode Pin Assignment ............................................................................................... 63
Figure 18-7. DS3253 Hardware Mode Pin Assignment............................................................................................. 64
Figure 18-8. DS3253 Parallel Bus Mode Pin Assignment......................................................................................... 65
Figure 18-9. DS3253 SPI Bus Mode Pin Assignment ............................................................................................... 66
Figure 18-10. DS3254 Hardware Mode Pin Assignment........................................................................................... 67
Figure 18-11. DS3254 Parallel Bus Mode Pin Assignment ....................................................................................... 68
Figure 18-12. DS3254 SPI Bus Mode Pin Assignment ............................................................................................. 69
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DS3251/DS3252/DS3253/DS3254
LIST OF TABLES
Table 1-A. Applicable Telecommunications Standards ............................................................................................... 6
Table 6-A. Global Pin Descriptions............................................................................................................................ 10
Table 6-B. Receiver Pin Descriptions ........................................................................................................................ 11
Table 6-C. Transmitter Pin Descriptions.................................................................................................................... 11
Table 6-D. Hardware Mode Pin Descriptions ............................................................................................................ 12
Table 6-E. Parallel Bus Mode Pin Descriptions......................................................................................................... 13
Table 6-F. SPI Bus Mode Pin Descriptions ............................................................................................................... 13
Table 6-G. Transmitter Data Select Options ............................................................................................................. 14
Table 6-H. Receiver PRBS Pattern Select Options................................................................................................... 14
Table 6-I. Hardware Mode Jitter Attenuator Configuration ........................................................................................ 14
Table 7-A. Register Map............................................................................................................................................ 15
Table 9-A. DS3 Waveform Template......................................................................................................................... 29
Table 9-B. DS3 Waveform Test Parameters and Limits............................................................................................ 29
Table 9-C. STS-1 Waveform Template ..................................................................................................................... 29
Table 9-D. STS-1 Waveform Test Parameters and Limits ........................................................................................ 29
Table 9-E. E3 Waveform Test Parameters and Limits .............................................................................................. 30
Table 14-A. Transformer Characteristics................................................................................................................... 36
Table 14-B. Recommended Transformers ................................................................................................................ 36
Table 16-A. JTAG Instruction Codes ......................................................................................................................... 42
Table 16-B. JTAG ID Code........................................................................................................................................ 43
Table 17-A. Recommended DC Operating Conditions.............................................................................................. 44
Table 17-B. DC Characteristics ................................................................................................................................. 44
Table 17-C. Framer Interface Timing......................................................................................................................... 45
Table 17-D. Receiver Input Characteristics—DS3 and STS-1 Modes ...................................................................... 47
Table 17-E. Receiver Input Characteristics—E3 Mode ............................................................................................. 47
Table 17-F. Transmitter Output Characteristics—DS3 and STS-1 Modes................................................................ 48
Table 17-G. Transmitter Output Characteristics—E3 Mode...................................................................................... 48
Table 17-H. Parallel CPU Interface Timing ............................................................................................................... 49
Table 17-I. SPI Interface Timing ................................................................................................................................ 54
Table 17-J. JTAG Interface Timing............................................................................................................................ 55
Table 18-A. Pin Assignments Sorted by Signal Name .............................................................................................. 56
Table 20-A. Thermal Properties, Natural Convection................................................................................................ 71
Table 20-B. Theta-JA (θ
JA
) vs. Airflow ....................................................................................................................... 71
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DS3251/DS3252/DS3253/DS3254
FEATURES (CONTINUED)
Receiver
AGC/equalizer block handles from 0 to 15dB of cable loss
Loss-of-lock (LOL) PLL status indication
Interfaces directly to a DSX monitor signal (~20dB flat loss) using built-in preamp
Digital and analog loss-of-signal (LOS) detectors (ANSI T1.231 and ITU G.775)
Optional B3ZS/HDB3 decoder
Line-code violation output pin and counter
Binary or bipolar framer interface
On-board 2
15
- 1 and 2
23
- 1 PRBS detector
Clock inversion for glueless interfacing
Tri-state clock and data outputs support protection switching applications
Per-channel power-down control
Transmitter
Binary or bipolar framer interface
Gapped clock capable up to 51.84MHz
Wide 50
±
20% transmit clock duty cycle
Clock inversion for glueless interfacing
Optional B3ZS/HDB3 encoder
On-board 2
15
- 1 and 2
23
- 1 PRBS generator
Complete DS3 AIS generator (ANSI T1.107)
Unframed all-ones generator (E3 AIS)
Line build-out (LBO) control
Tri-state line driver outputs support protection switching applications
Per-channel power-down control
Output driver monitor
Jitter Attenuator
On-chip crystal-less jitter attenuator
Meets all applicable ANSI, ITU, ETSI and Telcordia jitter transfer and output jitter requirements
Can be placed in the transmit path, receive path or disabled
Selectable FIFO depth: 16, 32, 64 or 128 bits
Overflow and underflow status indications
Clock Adapter
Operates from a single DS3, E3, STS-1, 19.44 MHz, 38.88 MHz, or 77.76 MHz master clock
Synthesizes clock rates that are not provided externally
Use of common system timing frequencies such as 19.44 MHz eliminates the need for any local oscillators,
reduces cost and board space
Very small jitter gain and intrinsic jitter generation
Optionally provides synthesized clocks on output pins for use by neighboring components, such as framers or
mappers
Parallel CPU Interface
Multiplexed or nonmultiplexed 8-bit interface
Configurable for Intel mode (CS,
WR, RD)
or Motorola mode (CS,
DS,
R/W)
SPI CPU Interface
Operation up to 10 Mbit/s
Burst mode for multi-byte read and write accesses
Programmable clock polarity and phase
Half-duplex operation gives option to tie SDI and SDO together externally to reduce wire count
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嵌入式系统
