DS100DF410: 40G QSFP issue; no link

Hi Kevin,

What is the exact datarate?

How are you configuring the DF410?

Regards,

Lee

The data rate is 10G per lane for 40G Ethernet.

The Retimer is mostly default settings except using Retimed data mode.

Are there Retimer settings to support 40G when using all four channels.

Hi Kevin,

The retimer is designed to work with the default settings when the input signals are running at a datarate of 10.3125 Gbps.

Do you have a 25 MHz input clock?

The DS100DF410 is in retimed mode by default.

Regards,

Lee

Yes, the Retimer circuit uses 25Mhz clock with clock mode set to 3.

Hi Kevin,

What additional register changes are being used in this application?  If you can create a file with the shared and channel register space it would be good to have a look at all the register information.

Thanks and Regards,

Lee

Hi Lee,

The register init list is below; there are no other adjustments:
RT5 thru RT8 are the four DS100DF410 chips making up two 40G Ethernet ports connecting to 40G QSFP's.
The circuit connects QSFP's on server to Radiall optics modules to the Retimers then out to 40G Ethernet switch via backplane.

;RT5 write enable broadcast all channels.
;RT5 Select reference clock mode fast lock.
;RT5 bypass PFD_OV
;RT5 select PFD Retimed Data
;RT5 set VOD=1.0v swing
;RT5 set DEM= -3.5dB
;RT5 set EOM= 400mV
;
;RT6 write enable broadcast all channels.
;RT6 select reference clock mode fast lock.
;RT6 bypass PFD_OV
;RT6 select PFD Retimed Data
;RT6 set VOD=.8v swing
;RT6 set DEM= -6dB
;RT6 set EOM= 400mV
;
;RT7 write enable broadcast all channels.
;RT7 Select reference clock mode fast lock.
;RT7 bypass PFD_OV
;RT7 select PFD Retimed Data
;RT7 set VOD=1.0v swing
;RT7 set DEM= -3.5dB
;RT7 set EOM= 400mV
;
;RT8 write enable broadcast all channels.
;RT8 select reference clock mode fast lock.
;RT8 bypass PFD_OV
;RT8 select PFD Retimed Data
;RT8 set VOD=.8v swing
;RT8 set DEM= -6dB
;RT8 set EOM= 400mV