Let’s take a better look at the other two parameters, Active to Precharge Delay (tRAS) and Command Rate (CMD). As with the other parameters, these two parameters work with the memory real clock (which is half of the memory labeled clock). The lower these parameters, the faster the memory will be.

• Active to Precharge Delay (tRAS): After an Active command is issued, another Precharge command cannot be issued until tRAS has elapsed. So, this parameter limits when the memory can start reading (or writing) a different row.
• Command Rate (CMD): It is the time taken by the memory chip from being activated (through its CS – Chip Select – pin) and when any command can be issued to the memory. This parameter carries the letter “T” with it. Possible values are 1T or 2T, meaning one clock cycle or two clock cycles, respectively.