Possible values of an option:
Depend on memory type, there can be a variant [Auto]
The option description:
Sets the quantity of steps demanded on a full cycle access by a line of the data (parametre tRC in the access diagramme). For SDRAM usually lies in a range from  to  steps, for DDR SDRAM — from  to  steps, for DDR2 SDRAM — from  to  steps, for DDR3 SDRAM — from  to  steps. If there is a variant [Auto], the information undertakes from microcircuit SPD.
Other options identical to destination: