1.8V HSTL standard vs JEDEC 1.5V HSTL standard

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Rocky&Bulwinkle

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I am working with an interface that I have been told is 1.8V HSTL (High Speed Transceiver Logic), however the JEDEC committee only defines a 1.5V HSTL. :-? Does anyone know if there is an official standard for 1.8V HSTL? Where did it originate from? I am looking for some formal definitions of its operation, in particularly with reference to VOHmin and VILmax for the RX.
 

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