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Originally Posted by fordtruckman_05 Sorry to be a newbie! I know just about nothing about memory.... Can somebody tell me what memory timing is? and maybe a good link to a place that shows how to do time it? Also what is the difference between 2.5,3,3,7 T2 and 2,2,2,6 T1....mainly whats the diff between T1 and T2. |
Those timings are shorthand notations for:
CAS: 2.5
tRCD: 3
tRP: 3
tRAS: 7
CMD: 2T
CAS: 2
tRCD: 2
tRP: 2
tRAS: 6
CMD: 1T
CAS/tRCD/tRP/tRAS/CMD.
CAS
CAS is short for Column Address Strobe.
CAS latency is the time (in clock cycles) required to access a column of memory on a DRAM memory module.
A CAS3 rated memory module requires 3 clock cycles to address a column of memory, where a CAS2 rated memory module can accomplish the same task in only two clock cycles.
CAS is the most important of any of these numbers. The rest are, comparatively, irrelevant.
tRCD
tRCD is the cycle time between the row strobe, and the location of the exact memory block desired.
tRP
tRP is the amount of time it takes for memory to terminate the access in one row and begin another.
tRAS
tRAS is the time between receiving a request for data electronically on the pins of a memory module and then initiating RAS to start the actual retrieval of data.
CMD
CMD rate is the time from a chip select until a Row Activate Command can be given.
Linear Mode
