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Typical Test and Setup Configurations
If a parallel BERT is not available, the designer can take advantage of the built
in test mode of the device, see Figure 2–2. If the designer asserts the PRBSEN
pin high this results in a pseudo random bit pattern to be transmitted. This pin
also puts the receiver in a mode to detect a valid PRBS pattern. A valid pattern
is indicated by the PRBSPASS pin indicating high. This test only validates the
high-speed serial portion of the device and system interconnects. The PRBS
pattern is compatible with most serial BERT test equipment. This function
allows the operator to isolate and test the transmitter and receiver
independently. A typical configuration is shown in Figure 2–3. The dashed
lines represent optional connections that can be made monitoring eye patterns
and measuring jitter.
Figure 2–2. TLK2501 Serial Loop-Back Test Configuration
Jumper Selection
GND
TESTEN
HP8133A
HP83480 or
Tek 11801
PRBSEN
LCKREFN
Pulse Generator
EXT
Digital
Oscilloscope
ENABLE
J7
INPUT
TX_ER
LOOPEN
Channel 1
O/P
TRIGGER
OUT
CH1
CH2
Trigger
TX_EN
GND
GTX_CLK
Channel 1
PRBS
2^7-1
TX–
TX+
TDS820 Digital
Oscilloscope
PRBS_PASS
RX+
RD 0-15
RX–
PRBS 2^7-1
TLK2501EVM
Evaluation Board
2-4
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