NB3x6x1xxG8DFNEVK
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5
Select Output Termination
DUT outputs are routed to three SMA connectors on the main board (J7, J9, and J23) to provide termination for CLK0, CLK1,
and CLK2 respectively. By turning rotary switches U15 and U16, the board will automatically terminate the programmed
output level for CLK0 and CLK1, to its respective output termination in table below.
Rotary Switch
Position
U15 output for CLK0 U16 output for CLK1
1
LVCMOS
LVCMOS
2
HCSL
HCSL
3
LVPECL
LVPECL
4
CML
CML
5
LVDS
LVDS
Note: CLK2 output only supports LVCMOS levels; therefore its termination is fixed.
Interfacing with Test Equipment
Monitor DUT outputs from main board with an oscilloscope with either SMA connectors or on board jumpers.
1. To use SMA connectors (J7, J9, J23), use oscilloscopes Hi−Z feature or a Hi−Z probe to monitor outputs. (Ensure
probe is properly grounded)
2. To use Jumpers (J33, J34, J35), use a Hi−Z probe connected to jumper pin marked 0. (Ensure probe is properly
grounded)
Both options can be used to monitor all three DUT outputs.
Controlling the Device (GPIO pins)
The device has multiple functions that can be programmed via control pins, below is a list of control pins and their respective
SMA connector.
OE: Pin used to enable or disable outputs individually. The main and daughter boards both have OE pins that can be easily
accessed via jumpers.
Main board: CLK0=J28, CLK1=J25, CLK2=J24
Daughter board: CLK0=J27, CLK1=J28, CLK2=J29
OE
Function
0
CLK Disabled
1
CLK Enabled
PD#: Pin used to power down device, this pin can be controlled either with J29 (main board) or J26 (daughter board). The logic
state of this signal corresponds to the LED (D9) on the main board.
PD#
Function
LED (D9)
0
Device Powered Down
Off
1
Device Powered Up
On
