Question

Greetings,
 
I need to know what is the output characteristic impedance of the VHDC connectors on the Genesys Virtex 5 FPGA Develpment Board. The datasheet only says they are impedance-controlled matched pairs and the schematic does not have this info. Some online forums said SCSI is defined by ANSI X3.13, the nominal diff cable impedance is 122 Ohms and I want to check if my board IO is consistent with this standard or not. I need to design a mating board to convert high speed differential signals into single ended, and signal integrity is a big deal.
 
Thanks in advance,
Emanuel

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Hello Emanuel,

The connector does not have controlled impedance. On the board we have 50 Ohm single ended and 100 Ohm +/- 10% differential. 

Best regards,

Bianca

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