1. An apparatus comprising: a mode register comprising: a first register, a second register, a third register configured to store a first control parameter used to select between the first and second registers, and a fourth register configured to store a second control parameter used to select between the first and second registers; and a control logic circuit coupled to the mode register; wherein the control logic circuit is configured to: write a first parameter code to the first register under the first control parameter selecting the first register, and write a second parameter code to the second register under the first control parameter selecting the second register; and wherein the control logic circuit is further configured to: set a first memory operating condition based, at least in part, on the first parameter code under the second control parameter selecting the first register, and set a second memory operating condition based, at least in part, on the second parameter code under the second control parameter selecting the second register.