The Texas Instruments (TIä) TNETE2201 EVM (evaluation module) k it is a tool used to
evaluate and design high-speed prototypes using the TNETE2201 Ethernet Transceiver
IC (10 mm x 10 mm TQFP plastic package). The EVM kit is used to evaluate device
parameters while acting as a guide for high-speed board layout. The high-speed
interface is selectable between a 50-W SMA connector and a GBIC standard interface.
The GBIC standard also provides a 75-W copper interface module and various fiber optic
options. Overall, the designer can use the EVM kit as a tool for successful evaluation
and design of an end product.
Board Layout and Configuration......................................................................................................................3
Test Configuration and Results........................................................................................................................4
Board Layouts, Schematics, and Bill of Materials............................................................................................6
Table 1. Default Setup as Shipped..................................................................................................................3
Table 2. TNETE2201 EVM Board Bill of Materials..........................................................................................8
Introduction
The TNETE2201 EVM kit can act as a daughter board that plugs into new or existing
designs. By providing the appropriate cabling, the EVM kit can interface with just about
any test equipment or other reference designs. The EVM kit's high-speed serial interface
can use either the GBIC (Gigabit Interface Converter) standard interface or a 50-ohm
SMA connection. In addition, the GBIC specification allows the designer to choose either
a 75-ohm copper module or a selection of fiber-optics modules.
As the frequency of operation increases, the board designer must take special care to
ensure that the highest signal integrity is maintained. To achieve this, the board’s
impedance is controlled for both 50-ohm and 75-ohm high-speed transmission lines. In
addition, the 50-ohm impedance mismatches are reduced by designing the component
pad size to be as close as possible to the width of the connecting transmission line. Vias
are minimized and, when necessary, placed as close as possible to the device drivers.
Overall, the board layout is designed and optimized to support high-speed operation.
Thus, understanding impedance control and transmission line effects are crucial when
designing high-speed boards.
Some of the advanced features offered by the EVM kit include:
r
PCB (printed circuit board) designed for speeds in excess of 1.25 Gbps
r
Flexible—The EVM can be configured to operate with multiple device types and with
copper or fiber interfaces.
r
Integrated GBIC Interface eliminates the need for two boards.
r
All input/output signals are accessible for rapid prototyping.
r
Clock input is selectable for either 8/14 pin crystal or external clock input.
r
Power can be supplied either by banana jacks or a 20-pin connector.
r
Series terminated parallel outputs
TNETE2201 EVM Kit Setup and Usage2
Application Report
SLLA032
Board Layout and Configurat ion
The TNETE2201 EVM kit is designed to give the developer many options for operation.
Many of these options are selectable by DIP switch and others may require board
component removal or additions. The following sections provide guidelines to config ure
the EVM kit for different modes of operation.
The EVM kit is normally delivered in a default configuration that requires external clock
and data inputs. The high-speed serial input and output are routed through the 50-ohm
transmission line path. The GBIC interface is not connected and would require some
resistor modifications to be functional. The default setup is useful for testing the board
and interface IC. The designer might consider testing the bit error rate, jitter, and eyediagram characteristics of the system. The TNETE2201 EVM is shipped with certain
components installed for default operation. Table 1 lists the default configuration.
Note: X is a don't care state (default posi ti on).
The GBIC Configuration requires a modification of the steering capacitors C23 through
C30. This requires removing C24, C26, C27, and C30 and soldering these capacitors in
locations C23, C25, C28, and C29 (see Figure 1).
Figure 1. GBIC Setup Modifications
GBIC
INSTALLED
CAPACITORS
Test Configuration and Results
The serial Bit Error-rate Ratio Test (BERT) is useful for evaluating device and board
characteristics. Using this test, we can determine the eye diagram characteristics of the
system, as shown in Figure 3. The test setup is illustrated in Figure 2.
The HP71603B 3-Gbps Serial BERT outputs a high-speed serial stream to the test board
where the data is converted by the TNETE part to a 10-bit parallel format. The parallel
data is then looped back from the receiver to the transmitter. The pulse generator
provides a clock input to the transmitter. The external clock source is necessary because
the receiver's recovered clock is half the frequency necessary for transmission.
TNETE2201 EVM Kit Setup and Usage4
Application Report
SLLA032
Both the pulse generator and the BERT are synchronized with an external clock source.
The operator adjusts the variable phase delay to ensure that the clock meets the setup
and hold time of the data. The parallel data along with the clock is routed to the
transmitter where the data is serialized and captured by the oscilloscope. Figure 3 shows
an example eye diagram taken using this technique.
Figure 2. Bit Error-Rate Ratio Test Configuration
Wizard
(With parallel
ports looped)
RX-
RX+
External Clock
For Sync
Data In
Sync
HP71603B
BERT
Data Out
Data Out
Sync
(Variable Delay)
36”
36”
HP8133A
Pulse Generator
Clk Out
Figure 3. Eye Diagrams of High-Speed Serial Outputs
TX+
TX-
36”
REFCLK
HP54750A
Digital O’Scope
36”
Channel 1
TNETE2201 EVM Kit Setup and Usage5
Application Report
SLLA032
Board Layouts, Schematics, and Bill of Materials
TNETE2201 EVM Kit Setup and Usage6
bom_list.txt
07/10/98 15:29:30 Electronics Design System Page: 0001
Bill of Materials
<<<From Job: fcge>>>
01-31xxx-xxx
TEXAS INSTRUMENTS INCORPORATED
Mixed Signal Products
T.I. Internal Data ENGINEER: RELEASED:________________
-----------------------------------------------------------------------------------------------------------------------------------ITEM| QTY | MFG | MFG PART# | Ref Des | DESCRIPTION | VALUE or FUNCTION | SOCKET
TI Number-800-800-1450
Korea080-551-2804
Malaysia1-800-800-011
TI Number-800-800-1450
New Zealand000-911
TI Number-800-800-1450
Philippines 105-11
TI Number-800-800-1450
Singapore800-0111-111
TI Number-800-800-1450
Taiwan080-006800
Thailand0019-991-1111
TI Number-800-800-1450
Fax886-2-2378-6808
Emailtiasia@ti.com
TI is a trademark of Texas Instruments Incorporated.
Other brands and names are the property of their respective owners.
TNETE2201 EVM Kit Setup and Usage13
Application Report
SLLA032
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their
products or to discontinue any product or service without notice, and advise customers to
obtain the latest version of relevant information to verify, before placing orders, that
information being relied on is current and complete. All products are sold subject to the
terms and conditions of sale supplied at the time of order acknowledgement, including
those pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at
the time of sale in accordance with TI's standard warranty. Testing and other quality
control techniques are utilized to the extent TI deems necessary to support this warranty.
Specific testing of all parameters of each device is not necessarily performed, except
those mandated by government requirements.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE
POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR
ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS"). TI SEMICONDUCTOR
PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR WARRANTED TO BE
SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS
IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER'S RISK.
IMPORTANT NOTICE
In order to minimize risks associated with the customer's applications, adequate design
and operating safeguards must be provided by the customer to minimize inherent or
procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does
not warrant or represent that any license, either express or implied, is granted under any
patent right, copyright, mask work right, or other intellectual property right of TI covering
or relating to any combination, machine, or process in which such semiconductor
products or services might be or are used. TI's publication of information regarding any
third party's products or services does not constitute TI's approval, warranty, or
endorsement thereof.
Copyright Ó 1999 Texas Instruments Incorporated
TNETE2201 EVM Kit Setup and Usage14
Loading...
+ hidden pages
You need points to download manuals.
1 point = 1 manual.
You can buy points or you can get point for every manual you upload.