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Quad Net
Global Clock Net
GCLK Pin
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There are five Quad-Net local clock networks in each quadrant for a total of 20 in a device.
Each Quad-Net is local to a quadrant. Before driving the columns clock buffers, the quad-net is
driven by the output of a mux which selects between the GCLK input and an internally generated
clock source (see )LJXUH ).
Internally generated clock, or
clock from general routing network
Global Clock
(GCLK) Input
Global Clock Network
FF
tPGCK
tBGCK
Global Clock Buffer
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