October 2012
SNLU120
3
SW9
INPUT_EN
MODE
INPUT_EN pin
0: Normal Operation, FANOUT is disabled, use SEL0/1 to select the A or B
input/output (see SEL0/1 pin), input always enabled with 50 ohms.
R: Reserved (DO NOT USE).
F: AUTO - Use RX Detect, SEL0/1 to determine which input or output to enable,
FANOUT is disable
1: Normal Operation, FANOUT is enabled (both S_OUT0/1 are ON). Input
always enabled with 50 ohms.
MODE pin
0: SATA/SAS, PCIe GEN 1/2 and 10GE
R: PCIe GEN 3
F: Auto Detect (PCIe GEN 1/2 or GEN 3)
1: 10G-KR
2. Setup:
2.1. Connect J28, J29: VIN = 3.3V and GND.
For VIN = 3.3V:
Set SW7 pin1 (VDD_SEL) to the ON position (enable internal LDO regulator).
Do not connect VDD at J30.
2.2. Set jumper – J27 for VIH connection to VIN or VDD.
2.3. Connect 50 Ohm SMA cables to the board J1 to J24 SMA connectors.
2.4. Set the control pins to configure the device for desired operation.
SW7
RESET = 0: enables the device; set switch pin2 to the ON position to connect to GND.
SW9
INPUT_EN = 0: 50 ohm termination, 1:2 FANOUT is disabled; set switches (3-2-1) = (
ON
-OFF-OFF)
INPUT_EN = 1: 50 ohm termination, 1:2 FANOUT is enabled; set switches (3-2-1) = (OFF-OFF-
ON
)
SW9
MODE = 0: GEN 1,2 and 10GE mode; set switches (6-5-4) = (
ON
-OFF-OFF)
MODE = R: GEN 3 mode; set switches (6-5-4) = (OFF-
ON
-OFF)
MODE = 1: 10G-KR mode; set switches (6-5-4) = (OFF-OFF-
ON
)
SW6
SEL0 = 0: selects B channel; set switches (3-2-1) = (
ON
-OFF-OFF)
SEL0 = 1: selects A channel; set switches (3-2-1) = (OFF-OFF-
ON
)
SW6
SEL1 = 0: selects B channel; set switches (3-2-1) = (
ON
-OFF-OFF)
SEL1 = 1: selects A channel; set switches (3-2-1) = (OFF-OFF-
ON
)
2.5. Set the input equalization level.
For external pin mode control of the equalization level:
Set ENSMB = 0 (1kohm to GND) by using the SW2 (3-2-1) = (
ON
-OFF-OFF).
SW4 pin1,2 must be set to the OFF positions, so the SMBUS signals are disconnected.
Refer to Table 1 for information on the 3 switch settings for the 4 level input.
Example:
Set EQ_S[1:0] with SW1 for the S inputs (S_INA0, S_INB0, S_INA1, S_INB1).
SW1 (6-5-4), (3-2-1) = (OFF-
ON
-OFF), (OFF-
ON
-OFF) = EQ_S[1:0] = R,R = 16.6 dB at 5 GHz (level 6).
Set EQ_D1:0] with SW8 for the D inputs (D_IN0, D_IN1).
SW8 (6-5-4), (3-2-1) = (OFF-
ON
-OFF), (OFF-
ON
-OFF) = EQ_D[1:0] = R,R = 16.6 dB at 5 GHz (level 6).