03-17-2019 08:58 PM
I have a VCU108 which has QSFP28 and CFP2 ports. I have seen examples using the 100G Ethernet IP hard core over the CFP2 on VCU108, but not QSFP28.
Has anyone used the 100G Ethernet IP core over the QSFP28 interface? Can the 100G Ethernet IP core be used over the QSFP28 interface?
03-18-2019 09:54 AM
Hi @rchan ,
I haven't used this 100G Ethernet IP for QSFP+, but you should be able to do so, because both of them use GTY. However, even if you do so, QSFP+ on VCU108 can only give you 28Gbps (UG1066).
03-19-2019 10:39 PM
I've used the Ultrascale 100G Ethernet IP hard core with both CFP4 and QSFP28. CFP4 has basically the same interface as your CFP2 (assuming CAUI-4).
Differences between CFPx and QSFP28 that might affect your design:
I've never used a VCU108, so I can't comment on that.
03-20-2019 02:49 AM
I think the 28Gbps in UG1066 is the max. throughput per lane, and a QSFP has four lanes in total to yield 100G. This appears in the standard of QSFP28+.