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Honored ContributorDIFFIO_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). Would like to use them for LVDS input. Regards.4 Replies
Altera_ForumNo. 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- Altera_Forum
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. --------- --- Quote Start --- 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 --- Quote End --- - Altera_Forum
Correct. You can use 'DIFFIO_rx' pairs as sub-LVDS or LVDS input pairs and 'DIFFIO_tx' pairs as output pairs (or single ended outputs).
You just can't use 'DIFFIO_tx' pairs as inputs. Cheers, Alex - Altera_Forum
Thanks Alex !
--- Quote Start --- Correct. You can use 'DIFFIO_rx' pairs as sub-LVDS or LVDS input pairs and 'DIFFIO_tx' pairs as output pairs (or single ended outputs). You just can't use 'DIFFIO_tx' pairs as inputs. Cheers, Alex --- Quote End ---
