The datasheet for the HMCAD1520 specifies "RSDS output data levels, unless otherwise specified" for a number of the electrical characteristic tables.
It also says in the LVDS Drive Strength Programmability section:
"The LVDS interface offers good robustness at the RSDS (Reduced Swing Differential Signaling), given a careful LVDS wire layout. Using the 1.5mA RSDS will reduce the power consumption significantly compared to default 3.5mA LVDS.
However, I can't find any information on how to enable this mode. Table 20 shows that 1.5mA (RSDS) corresponds to the code "101" in ilvds_*<2:0> but further down, the same code "101" corresponds to 6.5mA.
I have found that my design works with the strength set to 0.5mA for all three LVDS output types. But with the datasheet recommending the 1.5mA RSDS for low power consumption, I also want to see if it works under those conditions.