Introduction
The Texas Instruments (TI™) TLK3134 SerDes evaluation module (EVM) board is used to
evaluate the functionality and the performance of TLK3134 XAUI Transceiver/4 Channel Multi-
Rate Transceiver device (289-ball BGA). The TLK3134 is a flexible four channel independently
configurable serial transceiver that can be configured to be compliant with the 10Gbps Ethernet
XAUI Specification, the 1000Base-X 1Gbps Ethernet Specification and will also support
1X/2X/10X Fibre Channel (FC), CPRI (x1/x2/x3), OBSAI (x1/x2/x4) data rates. Many common
applications may be enabled by way of externally available control pins and detailed control of
the TLK3134 on a per channel basis is available by way of accessing a register space of control
bits available through a two-wire access port called the Management Data Input/Output (MDIO)
interface.
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EVM PCB and High-speed Design Considerations
The board can be used to evaluate device parameters in addition to acting as a guide for high-
speed board layout. 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 to 50
Ω
for both the high-speed differential serial and low-speed parallel
data and clock connections. Vias are minimized and, when necessary, are designed to minimize
impedance discontinuities along the transmission line. Since the board contains both, serial and
parallel transmission lines, care was taken also to control trace length mismatch (board skew) to
less than +/- 1MIL.
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 this board include:
•
PCB (printed circuit board) is designed for optimal high-speed signal integrity.
•
SMP and parallel header fixtures are easily connected to test equipment.
•
All input/output signals are accessible for rapid prototyping.
•
The entire board can be powered from a single 5V power supply where the power planes
can be supplied through on-board regulators or through separate banana jacks for isolation.
•
On-board capacitors provide AC coupling of high-speed receive signals.
•
External parallel loop-back function can be achieved easily using simple 0.1 inch jumpers.
•
Entire Board can operate from a single 5V power supply, or from individual power supplies.
•
Voltage Monitoring LED circuits provide quick indication that the voltage is within
specification.
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The MDIO register map is located within the
TLK3134 XAUI Transceiver/4 Channel Multi-Rate Transceiver datasheet
.
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TLK3134 XAUI Transceiver / 4 Channel Multi-Rate Transceiver Evaluation Module (EVM) Users’ Guide
SLLU104A - September 2007
