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Quick Start Guide
4
Quick Start Guide
1. Connect J19: VIN = 3.3V or VDD = 2.5V and GND.
•
For VIN = 3.3V:
Set SW7 pin1 (VDD_SEL) to the ON position (enable internal LDO regulator) and float VDD at J19.
•
For VIN = 2.5V:
Set SW7 pin1 (VDD_SEL) to the OFF positions (disable internal LDO regulator) and float VIN at
J19.
2. Set jumper – J20 for VIH connection to VIN or VDD.
3. Connect 50 Ohm SMA cables to the board.
•
The input signals J1 to J8 can be connected from a pattern generator.Set SW7 pin1 (VDD_SEL) to
the ON position (enable internal LDO regulator) and float VDD at J19.
•
The output signals J9 to J16 can be connected to a scope.
Table 3. SMA Channel Connections
A/B Channels
Input Channel
Output Channel
J1 – IN_B2+, J2 – IN_B2-
J9 – , J10 – OUT_B2-
B-Channels
J3 – IN_B3+, J4 – IN_B3-
J11 – , J12 – OUT_B3-
J5 – IN_A0+, J6 – IN_A0-
J13 – , J14 – OUT_A0-
A-Channels
J7 – IN_A1+, J8 – IN_A1-
J15 – , J16 – OUT_A1-
4. Set the control pins for normal operation
•
SW7 – RESET = 0 (enables the device): set switch pin2 to the ON position.
•
SW9 – INPUT_EN = 1 (50 ohm input termination): set switches (3-2-1) = (OFF-OFF-ON).
•
SW9 – MODE = VDD (enables SAS-3 / PCIe GEN3 mode): set switches (6-5-4) = (OFF-OFF-ON).
•
SW6 – SD_TH = F (default signal detect threshold level): set switches (3-2-1) = (OFF-OFF-OFF).
•
SW6 – LPBK - RES = F (normal operation): set switches (6-5-4) = (OFF-OFF-OFF).
7
SNLU122 – November 2012
DS125BR800EVM Evaluation Kit
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