Other Parameters

Let’s take a better look on the other two parameters, Active to Precharge Delay (tRAS) and Command Rate (CMD). As it happens with the other parameters, these two parameters work with the memory real clock (which is half the memory labeled clock), and the lower these parameters are, 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 been 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 (thru its CS – Chip Select – pin) and when any command can be issued to the memory. This parameter carries the letter “T” with it and possible values are 1T or 2T, meaning one clock cycle or two clock cycles, respectively.

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