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Altera_Forum
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10 years ago

DIFFIO_TX_P/N versus DIFFIO_RX_P/N Cyclone V and others

Hi, Can I use a DIFFIO_TX_P/N of a Cyclone V or other FPGAs as a LVDS input and vica versa? Although there is written TX (transmit) and RX (receive) there is also written DIFFIO (=input/output)....
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Altera_Forum
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10 years ago

Hi Alex,

thanks for your answer.

But I beleive I can use DIFFIO_RX as sub_LVDS input to receive diff. data, can I?

And DIFFIO_TX I can use as output (LVDS or single-ended) Am I right?

Regards.

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No. You can't use the 'DIFFIO_TX' pairs as LVDS input pins on Cyclone V. You can use 'DIFFIO_RX' pairs as emulated LVDS outputs. However, that's the extent of the flexibility.

This differs from previous Cyclone families which offered more generic TX/RX pairs. E.g. Cyclone IV offers 'DIFFIO_xxp/n' pairs. These can be used as either input of output LVDS pairs.

Cheers,

Alex

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