| Timing | Timing Definition | Abbreviations | What it does |
| 10 | CAS Latency | CL | Delay between activation of row and reading of row. |
| 11 | RAS to CAS (or Row to Column Delay) | tRCD | Activates row. |
| 12 | Row Precharge Delay (or RAS Precharge Delay) | tRP or tRCP | Deactivates row. |
CAS latency:
CAS Latency is the ratio of the memory's column access time divided by the current system clock. The column access time turns out to be a constant value, so you can see as you in increase the system clock it becomes harder to achieve a lower CAS latency (e.g., the denominator grows, but the numerator stays the same).
RAS-to-CAS:
This is the latency between the Row Address Strobe and Column Address Strobe. Basically the delay between accessing the Row and the Column memory addresses.
Row Precharge Delay:
The number of clock cycles taken between the issuing of the precharge command and the active command.