4.4. PCI Express Mode
In PCI Express mode, only the PCI Express controller stack is active. The four PCI Express cores (x16, x8, x4_0 and x4_1) interface with the application logic in the FPGA fabric via Avalon® streaming interfaces.
pX: X is port number, ranges from 0 to 3.
st#: # is segment number, ranges from 0 to 3.
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