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Jack_Lin
New Contributor
New ContributorBidirectional pin USB_RX with a pseudo-differential I/O standard must use the OEIN port of the node
I am trying to make a bidirectional differential line using Cyclone V. In VHDL, I set USB_RX, USB_RXn as INOUT on the top level (they are assigned to a Differential SSTL-II 2.5 pair). I used the AL...
Hi Jack,
not quite clear what you want to achieve. USB (both FS and HS) is a half-duplex protocol and involves push-pull drivers with enable signal.
Regards Frank
FvM
Super Contributor
Super ContributorHi Jack,
your instantiation of DIFF_IO_BUF makes no sense. OE pins must be driven by a signal that switches direction dynamically.
Regards Frank
