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Altera_Forum
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9 years ago

Cyclone V bidirectional half-duplex LVDS?

Dear All, We are designing a board with a Cyclone V connected to another (already existing) board via a bidirectional half-duplex LVDS link. We would prefer to use only 2 pins of the FPGA to im...
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Altera_Forum
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9 years ago

You *cannot* use the DIFFIO_TX pins on Cyclone V for differential input signals. These signals connect to the dedicated TX channels. The DIFFIO_RX pins can be used, for output signals, by virtue of their emulated DIFFOUT capability. So, for a bidirectional differential signal you must use a DIFFIO_RX pair.

Cheers,

Alex