does altlvds have termination 100 ohm setting_

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Quartus II v11.1 says

"Stratix devices support internal differential termination with a nominal

resistance value of 137.5 Ω for LVDS input receiver buffers."

Strange, it needs 100 Ω, but the internal resistance is 137.5 Ω, why?

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Table 5-31, page 165 of the Stratix II Handbook:

http://www.altera.com/literature/lit-stx2.jsp

Indicates the terminations are 100-Ohms +/-20 percent.

Cheers,

Dave