cycloneVGX transreceiver compatibilityi PCML to CML

PCML is Altera's "Pseudo Current Mode Logic". The FPGA's I/O doesn't have a true CML structure - it can't, the I/O is flexible to accommodate a variety of I/O standards. So, Altera have simply named it PCML to clearly show that it isn't true CML. However, it can be used to connect directly** to an SFP module.

**Thanks to AC coupling in the serial links on the SFP module.

Have a look through App Note 518 - "sgmii interface implementation using soft cdr mode of altera fpgas (https://www.altera.com/content/dam/altera-www/global/en_us/pdfs/literature/an/an518.pdf)". This discusses interfacing SFP modules to FPGAs.

You may want to refer to the following thread too:

(http://www.alteraforum.com/forum/showthread.php?t=30105)http://www.alteraforum.com/forum/showthread.php?t=30105

Cheers,

Alex