LXD386 — Evaluation Board for
Quad T1/E1 Applications
Developer Manual
January 2001
As of January 15, 2001, this document replaces the Level One documentOrder Number: 249215-001
LXD386 — Evaluation Board for Quad T1/E1 Applications User Guide.
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Designers must not rely on the absence or characteristics of any features or instructions marked “reserved” or “undefined.” Intel reserves these for
future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them.
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ivLXD386 — Evaluat ion Board for Quad T1/E1 Applications Developer Ma nual
Evaluation Board for Quad T1/E1 Applications — LXD386
1.0General Description
The LXD386 evaluation board is a versatile tool for engineers designing T1/E1 short haul
applications using the LXT386.
The evaluation board operates in one of two modes: Software (Host) mode or Hardware mode. In
Software mode, the device is controlled with the PC based configuration and monitoring software
through an i8051 microcontroller in terface. In Har dware mode, the device and ch annel contro ls are
set using shorting blocks and DIP switches located on the LXD3 86 evalua tion board.
The evaluation board provides banana jacks for each channel’s line interface to allow conn ection of
a T1/E1 pattern generator/analyzer. A connector is also provided for each channel’s framer or backend ASIC interface.
1.1Features
• Software and Hardware controllable
• ZIF LQFP socket for easy swapping of LXT386
• Banana jacks for power and line interfaces
• 10-pin connectors for framer/ASIC interface
• 8-pin connector for IEEE 1149.1 compliant JTAG boundary scan port
• Switches and shorting blocks for Hardware mode operation
• Compatible with Intel external i8051 microcontroller board
• PC-based software for ease of use
• Socketed transformer and termination components for easy experimentation
• Built-in overvoltage protection for line interface and power supply
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LXD386 — Evaluation Board for Quad T1/E1 Applications
Figure 1. LXD386 Evaluation Board
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Evaluation Board for Quad T1/E1 Applications — LXD386
2.0Overview
Caution:CMOS devices are static (ESD) sensitive. Take all industry standard precautions when handling the
evaluation board, LXT386 chip, and other sensitive electronic components.
Before proceeding with any evaluation board operations, review the specifications for the LXT3 86
transceiver.
2.1LXD386 Packing List
The evaluation board kit contains the following components:
• LXD386 evaluation board with the LXT386 installed.
• i8051 microcontroller interface board and PC serial port cable.
• PC compatible diskettes containing software for using the evaluation board in Software mode.
• Shorting block kit for selecting Hardware mode.
• LXD386 user guide.
• LXT386 data sheet.
2.2Equipment Requirements
The evaluation board kit includes all the circuit components needed for a successful evaluation.
However, the following lab equipment is required:
• Power Supply +3.3V DC (+5VDC for TVCC optional)
• Telecom cable or cable simulator (optional).
• T1/E1 pattern generator/analyzer.
• 1.544/2.048 MHz clock source (optional).
• For Software mode: an IBM compatible PC with minimum 386 40 MHz processor, available
serial po rt, mouse, VGA monitor, DOS 5.0+, and Microsoft Windows
Windows 9x is recommended.
2.3Control Modes
The LXT386 has two basic operating m odes: Hardware mode or Software (Host ) mode. In
Hardware mode, operation of the LXT386 is established by hard-wiring the pins. In Software
mode, operation of the LXT386 is controlled by an external microprocessor that communicates
with the LXT386’s internal registers via either a serial or parallel interface.
3.1 or later version,
The LXD386 evaluation board supports both hardware and software modes.
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LXD386 — Evaluation Board for Quad T1/E1 Applications
2.4Factory Settings
When shipped from the factory, the LXD386 evaluation board’s switches and jumpers are set for
software mode and parallel microprocessor interface.
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Evaluation Board for Quad T1/E1 Applications — LXD386
3.0Hardware Mode Set-Up and Operation
3.1Power Connections
The evaluation board has two power planes (VCC and TVCC) each of which is tied to a separate
red colored banana jack.
1. Connect the +3.3 VDC power supply to the VCC jack.
2. Connect either a +3.3 VDC or +5.0 VDC power supply to the TVCC jack.
3. Connect the power supply ground lead(s) to the black (GND) banana jack.
Jumper JP1 is provided to allow LXT386 current consumption meas urements and must be installed
for normal board operation. Jumper JP3 allows measurement of the current in the TVCC power
supply only. It must also be installed for normal operation.
3.2Hardware Mode Selection
To enable the Hardware mode of operation:
1. Set the MODE switch in switch block S1 to the LOW position.
2. Insert the two shorting blocks, provided with the evaluation board kit, into 20-pin sock ets JP4
and JP6.
3.3Loopback Mode Selection
The LXT386 LOOP/DLOOP signals are set by switches in switch block S1. Depending on the
LOOPn/DLOOPn combination selected for a particular channel, a different operation or loopback
mode is selected. Please refer to Table 1.
Table 1. LOOP/DLOOP Switch Settings
LOOPnDLOOPnChannel #n Operation
OpenxNormal Mode
LOWxRemote Loopback
HIGHLOWAnalog Local Loopback
HIGHHIGHDigital Local Loopback
1. “x” means “don’t care”
3.4Clock Edge Selection
The phase relation between RCLK and RPOS/RNEG is set by the CLKE switch in switch block
S4. Please refer to the “CLKE” sig nal pin in the LXT386 data sheet for details.
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LXD386 — Evaluation Board for Quad T1/E1 Applications
3.5Output Enable Selection
The OE switch in switch block S4 controls the operation of the LXT386 output drivers. For normal
operation (driver outputs enabled), set the OE switch to the ON position. Setting the OE switch to
OFF forces the output drivers to the high impedance state.
3.6Code Selection
In Hardware mode, the MO-INT-CO switch in switch block S4 selects the line encode/decode. To
select AMI encode/decode set to the ON position. To select B8ZS/HDB3 encode/decode set to the
OFF position.
3.7Monitoring Address Selection
Switch block S3 sets the Protected Monitoring Addresses A0 throug h A3. The factory defa u lt
setting is 0000 (no monitoring). See the LXT386 data sheet for details.
3.8Jitter Attenuator Selection
In Hardware mode, the JASEL switch in switch block S1 selects the position of the Jitter
Attenuator in the data path:
• Transmit path = LOW
• Receive path = HIGH
• JA disabled = center
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Figure 2. Default Switch Settings
Evaluation Board for Quad T1/E1 Applications — LXD386
S3
O
F
F
1 2 3 4
CLKE
OE
MO-INT-CO
MUX
S4
O
F
F
1 2 3 4
A0
A1
A2
A3
S2
O
F
F
1 2 3 4
LEN2
LEN1
LEN0
LOOP0
LOOP1
LOOP2
LOOP3
LOOP4
LOOP5
LOOP6
LOOP7
MODE
JASEL
LOW
S1
HIGH
1 2 3 4
NOTE:
OFF position = Low = ’0’
5 6 7 8 9 10
3.9Line Buildout Selection
Switch block S2 is used to select the transmit pulse shaping for T1 mode operation, as well as T1/
E1 mode selection. The factory default is 000 (E1 mode). Refer to the LXT386 data sheet for T1
pulse shape details.
3.10Master Clock Setup
The on-board 2.048 MHz oscillator can be used for MCLK source. An additional 1.544 MHz
oscillator is included for use in T1 operation mo de. A BNC co nnector ( J1 ) is p rov ided to allow us e
of an external MCLK source. J1 is internally terminated into 50
configure MCLK. Table 2 describes the options available with JP5. The factory setup for JP5 sets
internal oscillator timing as illustrated in Figure 3.
T a ble 2. JP5 Jumper Settings
JP5 SettingOperation
HIGHData recovery mode
EXTExternal MCLK source at BNC (J1)
INTInternal oscillator
LOWReceiver power-down
Ω. Jumper block JP5 is used to
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LXD386 — Evaluation Board for Quad T1/E1 Applications
Figure 3. Jumper Block JP5
3.11JTAG Boundary Scan Port
The eight pin connector JP2 shown in Figure 4 provides access to the IEEE 1149.1 compliant
JTAG boundary scan port for board testing purposes.
Figure 4. Jumper Block JP2
3.12Framer/ASIC Connection
Ten pin connectors p rovide access to the di gital signals necess ary for interf acing with the back-end
Framer/Mapper or ASIC. Figure 5 represents one of the four connectors with the factory jumper
connecting RCLK to TCLK.
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Figure 5. Jumper Block JP 31
3.13LED Indicators
Loss of Signal (LOS) status for each channel is indicated by four LEDs, labeled D3 thro ugh D6. If
the board is being used in the Software mode, the state of these LEDs will also be displayed on the
registers display screen.
Evaluation Board for Quad T1/E1 Applications — LXD386
3.14Line Interface
Access to the line interface is provided through the green and white banana jacks. The TIP signal
is routed to the white jacks for both transmit and receive directions. The RING signal is routed to
the green jacks for both directions.
An octal transformer is used for channels 1 to 3 (one transformer port is unused). Transformers in
channel 0 and line resistors /capacitors for channels 0 to 3 are socketed for easy swapping. Jumpers
JP7 to JP14 can be used to bypass the transmit series resistors for T1 ap pli cations with
TVCC=3.3V. See the LXT386 Data Sheet for details on transmit interface options.
3.15Board Protection
The LXD386 evaluation board is equipped with both power supply and line surge protection. Two
Transient Voltage Suppressors (TVS) are included for power supply protection (5V/3.3V). For the
T1/E1 line interface, the transmitters are protected with Schottky diodes and the receivers are
protected by series 1K
compliance.
Ω input resistors. This protection is sufficient for G.703 Annex B
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LXD386 — Evaluation Board for Quad T1/E1 Applications
4.0Software Mode Set-Up and Operation
4.1i8051 Microcontroller Board
An i8051 microcontroller interface board is provided with the evaluation board kit. Connect the
i8051 microcontroller board to the evaluation board at the 96 pin header labeled CON1. Connect
the microcontroller board to an available serial (COM) po rt on your PC u sing the cable prov ided in
the evaluation board kit.
Instead of the i8051, a user supplied microcontroller board may also be used to control the
LXT386. Evaluation board connector CON1 provides access to all the relevant LXT386
microprocessor interface signals.
4.2Evaluation Board Set-up
The evaluation board contains switches and jumpers to select various operating parameters. All
other parameters are controlled through the evaluation board software. When using the i8051
microcontroller provided with the kit, set the evaluation board switches and jump ers as f oll ows :
1. Select software mode by removing the shorting blocks from sockets JP4 and JP6.
2. Set the MODE switch (in switch block S1) to select serial or parallel mode :
— HIGH for parallel mode (factory default)
— Center position for serial mode
3. Set the JASEL switch (in switch block S1) to the center position.
4. Set MO-INT-CO switch (in switch block S3) to HIGH (Intel microprocessor).
5. Set MUX switch (in switch block S3) to HIGH (Multiplexed microprocessor address/data
bus).
6. Set CLKE switch (in switch block S3). Refer to “CLKE” signal pin in LXT386 data sheet for
details.
7. Set OE switch (in switch block S3) as described in “Output Enable Selection” on page 10.
8. Set the jumper on JP5 as described in “Master Clock Setup” on pag e 11.
4.3Test Equipment Connections
The evaluation board contains connectors to interface an external pattern generator and other test
equipment. See page 9 for details.
4.4Power Connections
Connect power supply as described in “Power Connections” on page 9.
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Evaluation Board for Quad T1/E1 Applications — LXD386
4.5Evaluation Board Software
When operating the evaluation board in the software mode, the software provided with the kit will
be used to configure the LXT386 and to monitor its operation. This software provides a point-andclick, user friendly interface with on-line help screens. Refer to the data sheet for detailed
information about the LXT386 transceiver.
4.6Software Installation and Start-Up
The minimum PC system requirements are:
• IBM compatible PC
• 386/40 MHz CPU (Pentium class recommended)
• Available serial port
• Mouse
• VGA monitor
• DOS version 5.0 or higher and Microsoft Windows 3.1 (Windows 9x recommended)
Begin the installation procedure by running the Setup.exe file on the installation diskette #1.
Follow the on-screen prompts to complete the software installation.
4.7Hardware Set-up Screen
Whenever the LXT386 software is run, the Hardware Set-up screen will appear first on the monitor
(see Figure 6). This screen is used to select the PC serial port to be used. Select an available serial
port and click the OK button.
4.8Quitting the Program
The program can be terminated at any time by clicking the “Exit” control button, located at the
right side of the screen.
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LXD386 — Evaluation Board for Quad T1/E1 Applications
Figure 6. Hardware Set-up Screen
4.9Configuration Screen
The configuration screen shown in Figure 7 is the next screen to appear on the monitor. It is the
primary control interface with the evaluation board. A graphical representation of each channel is
shown in a tabbed display box, along with the control buttons describe d in the following
paragraphs.
4.9.1Communications Modes
The option buttons located in the communications modes box are used to set the microprocessor
interface mode to parallel interface or serial interface.
Note:The selected communication mode must match the evaluation board MODE switch setting (see
“Evaluation Board Set-up” on page 14). The factory default setting is parallel mode.
4.9.2Registers
Clicking the Registers control button will select the Registers screen, enabling read/write access to
all the LXT386 registers. See “Registers” on page 16.
Select the transceiver channel you wish to configure b y clicking o n the corr espond ing tab s ymb ol.
Once a channel has been selected, set the operating mode by clicking on one of the three loopback
modes.
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4.9.4Apply to all Channels
Clicking the “Apply to All Channels” control button will configure the other three channels to the
settings displayed for the currently selected channel.
4.9.5Exit
The exit control button can be used at any time to close the software.
Figure 7. Configuration Screen
Evaluation Board for Quad T1/E1 Applications — LXD386
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LXD386 — Evaluation Board for Quad T1/E1 Applications
4.10Registers Screen
4.10.1Setting Registers
The Registers screen (see in Figure 8) allows direct control of all the LXT386 registers. Each
register is labeled by its functional name and hex addres s. Right click on a register na me for on-line
help.
4.10.2Status Indicators
Display boxes within the Registers screen show the state settings for individual bit positions of
each register. Each of the 4 least significant bits of these registers control the corresponding
transceiver channel, except where otherwise noted in the LXT386 specifications. The check boxes
beside the “Mode” column denote enabling of read/write step modes.
4.10.3Control Buttons
Clicking on the “Read All” button will initiate a global read of all LXT386 registers. Clicking on
the “Read Step” and “Write Step” buttons performs the indicated action only o n register s that have
the enable box checked. The “Back” button is used to return to the configuration screen, and the
“Exit” control button can be used at any time to close the software.
4.10.4Interrupts
The Interrupt indicator is located in the lower right corner. This indicator will turn red whenever
there are pending interrupts in the LXT386. Interrupts are cleared by reading the corresponding
Status Monitor register. When all interrupts are cleared, the Interrupt indicator will turn Green. See
Figure 8.
4.10.5Reset
While operating the evaluation board in Software mode, reset is accomplished by using the write
step function to write to the software reset register address 0Ah.
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Figure 8. Registers Screen
Evaluation Board for Quad T1/E1 Applications — LXD386
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LXD386 — Evaluation Board for Quad T1/E1 Applications