1 of 12
REV: 082103
GENERAL DESCRIPTION
The DS3112RD is a reference design for the DS3112
DS3/E3 framer/mux and the DS3150 DS3/E3 LIU.
Both devices are surface
mounted to minimize board
size and to provide signal integrity. The
DK101/DK2000 motherboard and included software
give point-and-click access to configuration and
status registers from a Windows
-based PC. LEDs
on the board indicate loss-of-signal, transmit driver
monitor, and PRBS sync status of the LIU. The board
provides BNC connectors for an external clock, the
line-side transmit and receive differential pairs, and a
connector for data path interface. A PLD provides
registered access to the LIU control pins along with
control of clock and data paths.
Each DS3112RD is shipped with a free DK101
motherboard. For complex applications, the DK2000
high-performance demo kit motherboard can be
purchased separately.
Windows is a registered trademark of Microsoft Corp.
REFERENCE DESIGN CONTENTS
DS3112RD Daughter Card
DK101 Demo Kit Motherboard
CD-ROM
ChipView Software
DS3112RD.DEF Definition File
DS3112.DEF Definition File
DS3112RD Data Sheet
DS3112 Data Sheet
DS3150 Data Sheet
ORDERING INFORMATION
PART DESCRIPTION
DS3112RD
DS3112 Reference Design
FEATURES
Soldered DS3150 and DS3112
BNC Connectors, Transformers, and Termination
Passives for the LIU
Careful Layout for Analog Signal Paths
Memory-Mapped PLD for Control of DS3150
BNC Connectors for External Clock and Line-
Side Interface
Compatible with DK101 and DK2000 Demo Kit
Motherboards
DK101/DK2000 and Included Software Provide
Point-and-Click Access to the DS3112 Register
Set
LEDs for Loss-of-Signal, Transmit Driver Monitor,
and PRBS Sync
DS3112RD
DS3/E3 Multiplexer Reference Design
www.maxim-ic.com
DS3112RD DS3/E3 Multiplexer Reference Design
2 of 12
COMPONENT LIST
DESIGNATION QTY
DESCRIPTION SUPPLIER
PART
C1C16, C20C27
24
0.1
mF 10%, 25V ceramic capacitors (1206)
Panasonic ECJ-3VB1E104K
C17C19 3
0.047
mF 10%, 50V ceramic capacitors (1206)
Panasonic ECU-V1H473KBW
C28C30 3
10
mF 20%, 16V tantalum capacitors (B case)
Panasonic ECS-T1CX106R
DS1DS4
4
LED, red, SMD
Panasonic
LN1251C
J1, J2
2
5-pin, right-angle, BNC connectors
Trompeter
UCBJR220
J3
1
5-pin, vertical, BNC connector
Cambridge
CP-BNCPC-004
J4J6
3
50-pin jumper, dual row
Samtec
TFM-125-02-S-D-LC
J7
1
10-pin, dual row, vertical connector
Digi-Key
S2012-05-ND
R1R4, R8, R14,
R500
7
10k
W 1%, 1/8W resistors (1206)
Panasonic ERJ-8ENF1002V
R5, R10
2
0
W 5%, 1/8W resistors (1206)
Panasonic ERJ-8GEYJ0R00V
R6, R7, R9,
R11R13
6
330
W 0.1%, 1/10W MF resistors (0805)
Panasonic ERA-6YEB331V
R501 1
75
W 5%, 1/8W resistor (1206)
Panasonic ERJ-8GEYJ750V
T1, T2
2
XFMR, 1-to-2 count, 6-pin SMT
Pulse
Engineering
PE-65968
TP1TP17
17
Testpoint, 1 plated thru-hole
--
--
U1 1
T3/E3
mux/framer
Dallas
Semiconductor
DS3112
U2
1
T3/E3/STS-1 line interface
Dallas
Semiconductor
DS3150T
U3
1
IC, hex interverter, SO
Toshiba
TC74HC04AFN
U4
1
IC, PLD, 100-pin TQFP
Altera
EPM7128AETC100-10
U5
1
IC, MUX, quad 2INPUT
Philips
74LVC157APW DH
BOARD FLOORPLAN
JTA
G
LED
LED
LED
LED
Rx
TRANSFORMER
Tx
TRANSFORMER
DS3150
Dallas
Semiconductor
DS3112
Tx BNC
Rx BNC
EXT
CLOCK
PLD
DS3112RD DS3/E3 Multiplexer Reference Design
3 of 12
PLD MEMORY MAP
The PLD on the DS3112RD is used to route clocks from the processor board DK2000/DK101 and to control the
DS3150 and the DS3112. The PLD is mapped at address 00h and contains 25 registers. The first eight registers
(excluding register address 01h, which has no function on the 3112RD) are read-only, and are programmed at the
factory to document board identification and revision information. The next 16 registers control the state of pins on
the DS3150 and DS3112. The last register controls the clock source to the FTCLK pin on the DS3112 and the
MCLK pin on the DS3150. The PLD provides tri-state control of the pins. If a 01h is written to a register, the
corresponding pin is forced high, a value of 00h forces the pin low, and writing any other value puts the pin in a tri-
state mode. The bit descriptions in the definition file for the DS3112RD describe how to control a pin specifically
(Table 1). For more information about definition files, refer to the DK101 data sheet or the DK2000 data sheet.
MEMORY MAP
The DS3112 is mapped at 1000h.
Table 1. DS3112RD CPLD Register Map
OFFSET NAME
TYPE
DEFAULT
VALUE
DESCRIPTION
0X0000 BID Read-Only
0x0D
Board
ID
0X0002
XBIDH
Read-Only
0x00
High Nibble Extended Board ID
0X0003 XBIDM Read-Only 0x00 Middle
Nibble
Extended
Board
ID
0X0004
XBIDL
Read-Only
0x01
Low Nibble Extended Board ID
0X0005
BREV
Read-Only
--
Board FAB Revision
0X0006
AREV
Read-Only
--
Board Assembly Revision
0X0007 PREV Read-Only -- PLD
Revision
0X0011
TDS0
Read-Write
0x00
DS3150 Transmit Data Select 0
0X0012
TDS1
Read-Write
0x00
DS3150 Transmit Data Select 1
0X0013
EFE
Read-Write
0x01
DS3150 Enhanced Feature Enable
0X0014
ICE
Read-Write
0x00
DS3150 Invert Clock Enable
0X0015 LBKS Read-Write 0x01 DS3150
Loopback
Select
0X0016
RMON
Read-Write
0x00
DS3150 Receive Monitor Mode
0X0017 TESS Read-Write 0x01 DS3150
T3/E3/STS-1
Select
0X0018
TTS
Read-Write
0x01
DS3150 Transmit Tri-State
0X0019
ZCSE
Read-Write
0x00
DS3150 Zero Code Suppression
0X001A
LBO
Read-Write
0x00
DS3150 Line Build-Out
0X001B RST Read-Write
0x01
DS3112
Reset
0X001C
MUXSEL
Read-Write
0x01
DS3112RD Data Path Mux
0X001D G747E Read-Write 0x00 DS3112
G747
Mode
Enable
0X001E
T3E3MS
Read-Write
0x00
DS3112 T3/E3 Mode Select
0X001F
FRMECU
Read-Write
0x00
DS3112 Error Counter Strobe
0X0020 FTMEI Read-Write 0x00 DS3112
Error
Insert
Strobe
0X0021
T3E3CLK
Read-Write
0x01
DS3112RD Clock Select
DS3112RD DS3/E3 Multiplexer Reference Design
4 of 12
LINE-SIDE CONNECTIONS
The DS3112RD implements the transmit (Tx) and receive (Rx) line interface networks recommended in the
DS3150 data sheet (Figure 1). The BNC connectors are labeled J1 (Tx) and J2 (Rx).
Figure 1. Line-Side Circuitry
INTERFACE CONNECTOR
Two 50-pin connectors (J4, J5) on the bottom of the board provide the processor interface, clocks, and power
supply from the DK101 or DK2000 motherboards. These connectors also provide a bidirectional clock/data/sync
connection with the DK2000. The third connector (J6) is provided for future expansion on the DK2000 and is not
connected on the DS3112RD.
CONNECTING TO A COMPUTER
Refer to the DK101 data sheet or the DK2000 data sheet for information.
BASIC OPERATION
The DS3112RD powers up in the T3 mode, transmitting all ones, as specified by the default values in the CPLD
registers (Table 1) and the DS3112's reset condition. The processor interface supplies the transmit clock by
default. The user must access registers in the DS3112 and the CPLD to configure the board. To facilitate
configuration, definition files that support the DS3112 reference design (DS3112.DEF, DS3112RD.DEF) can be
downloaded from our website,
www.maxim-ic.com/DS3112RD
.
DS3112RD INFORMATION
For more information about the DS3112RD--including the ChipView software, the latest support files (.DEF, .INI,
etc.), and the latest data sheet--please visit our website at
www.maxim-ic.com/DS3112RD
.
DS3112 INFORMATION
For more information about the DS3112, please consult the DS3112 data sheet, available on our website at
www.maxim-ic.com/DS3112
.
1:2ct
1:2ct
0.05
mF
TRANSMIT
RECEIVE
TXP
TXN
RXP
RXN
LIU
330
W
(1%)
0.05
mF
330
W
(1%)
DS3150
DS3112RD DS3/E3 Multiplexer Reference Design
Maxim/Dallas Semiconductor cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim/Dallas Semiconductor product.
No circuit patent licenses are implied. Maxim/Dallas Semiconductor reserves the right to change the circuitry and specifications without notice at any time.
Ma xi m I nt e gr at e d Pr o du ct s, 1 2 0 S a n G abr i el Dr i ve, S un n yv al e, C A 94 0 8 6 40 8- 7 37- 7 60 0
2003 Maxim Integrated Products
Printed USA
5 of 12
DS3150 INFORMATION
For more information about the DS3150, please consult the DS3150 data sheet, available on our website at
www.maxim-ic.com/DS3150
.
DK101/DK2000 INFORMATION
For more information about the DK101 or DK2000, please consult their respective data sheets, available on our
website at
www.maxim-ic.com/DK101
and
www.maxim-ic.com/DK2000
.
TECHNICAL SUPPORT
For additional technical support, please e-mail your questions to
telecom.support@dalsemi.com
.
PDF 
ZIP