T stands for Time
TCAS - the number of clock cycles needed to access a certain column of Data in RAM. CAS Latency, or simply CAS, is known as Column Address Strobe Latency, sometimes refered to as tCL.
TRCD - the number of Clock cycles needed between RAS and CAS. It is the time required between the computer defining the row and column of the given memory block and the actual read or write to that location. Stands for Row address to Column address Delay.
TRP - the number of clock cycles needed to terminate access to an open row of memory, and open access to the next row. Stands for Row precharge time.
TRAS - the miniumum number of clock cycles needed to access certain row of data in RAM between the data request and the precharge command. Known as Active to Precharge Delay.
The steps for the CPU to access data in RAM:
1. defines which row the requested data is in (RAS)
2. gives the RAM time to access requested row (RCD)
3. defines the column of requested data (CAS)
4. waits for the RAM to send requested data to the CPU
5. precharges the row to recycle it for subsequent use (RP)
---> Copied from Wikipedia lol
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