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Altera_Forum
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13 years ago

GXB_GND connection for Cyclone IV GX

Hi, I am using Cyclone IV GX FPGA. I am making use of the PCIe hard IP. I want to know how the GXB_GND pins need to be connected. Can I connect it directly to GND. The pin file shows that un...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Which of the 2 solutions are legal for Cyclone IV GX FPGA:

1). connect both unused dedicated reference clock ( REFCLK1n and REFCLK1p ) pins directly to PCB GND plane.

2). connect one unused dedicated reference clock REFCLK1p pin directly to PCB GND plane, but use another one from the pair ( REFCLK1n ) for reference clock.

P.S. The question is because I don't have enough space on PCB to place 10 KOhm resistor from unused REFCLK to GND.