Hello,
I'm trying to set up an interface from a legacy FPGA which only has 3.3V I/O to an ASIC which requires 2.5V for a gigabit ethernet GMII interface. This will be 8/10 bits running at 125MHz. It uses 8b/10b encoding so I believe that only 8 bits are actual data but I will need to provide the other 2 bits as control codes and I will need to send a TX clock as well.
At first I was considering using a couple SN74AVC4T245 parts but I became concerned about too much skew between the different parts so I began researching wider parts. It seems like the SN74AVC16T245 and other wider parts might be switching too slowly for what I'm trying to do.
I saw elsewhere in the forums a recommendation to use the LSF0108 part for higher speed applications so my question is what would the skew look like from one part to another? (That question would apply to my original idea of using several of the SN74AVC4T245 parts as well)
Thanks,
-Andrew