連結已複製
10 回應
Does the SFP module you refer to comply with the inf-8074i specification (ftp://ftp.seagate.com/sff/inf-8074.pdf)? I suspect it does.
Refer to Altera's "serial gigabit media independent interface (https://www.altera.com/solutions/technology/transceiver/protocols/pro-sgmii.html)" page. This discusses connecting SFP modules to Altera FPGAs, including Cyclone V GX. Cheers, AlexI must use the sfp module at 3.125 Gbps (it support up 4.25Gbps).
In my application i not use the gIgabit ethernet standard. I need to encode data with 8b/10b and then send it to sfp module. --- Quote Start --- Does the SFP module you refer to comply with the inf-8074i specification (ftp://ftp.seagate.com/sff/inf-8074.pdf)? I suspect it does. Refer to Altera's "serial gigabit media independent interface (https://www.altera.com/solutions/technology/transceiver/protocols/pro-sgmii.html)" page. This discusses connecting SFP modules to Altera FPGAs, including Cyclone V GX. Cheers, Alex --- Quote End ---The SFP module is not tied to any particular protocol. It can carry Gig Ethernet but it doesn't have to.
So, you should have no problem sending 8b/10b data, at 3.125Gbps, from a Cyclone V GX device (transceiver speed grade 6). Cheers, AlexHi Alex!
I agree with you. But my problem is with the electric level compatibility, CML of the SFP module, and the PCML of the fpga --- Quote Start --- The SFP module is not tied to any particular protocol. It can carry Gig Ethernet but it doesn't have to. So, you should have no problem sending 8b/10b data, at 3.125Gbps, from a Cyclone V GX device (transceiver speed grade 6). Cheers, Alex --- Quote End ---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, AlexThank you!!:)
--- Quote Start --- 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 Cheers, Alex --- Quote End ---Yes, you can.
I suggest you use the "GIGE-2.50Gbps" template (from the library - double click on it) and work backwards from there, changing any settings you need to. Change the "Parameter validation rules" to "Custom" and ensure the 8b/10b encoder/decoder is selected on the "PCS Options" tab. Cheers, AlexGIGE 2500 is 2500Mbps data and then 3125Mbps on wire?
is it right? --- Quote Start --- Yes, you can. I suggest you use the "GIGE-2.50Gbps" template (from the library - double click on it) and work backwards from there, changing any settings you need to. Change the "Parameter validation rules" to "Custom" and ensure the 8b/10b encoder/decoder is selected on the "PCS Options" tab. Cheers, Alex --- Quote End ---