MSI X79A User Guide - Page 62
BIOS Setup, ory cell., cell., read command starts., tRRDR, tRRDD, tWWDR, tWWDD, tRWDRDD
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BIOS Setup ▶ tRAS Determines the time RAS (row address strobe) takes to read from and write to memory cell. ▶ tRFC This setting determines the time RFC takes to read from and write to a memory cell. ▶ tWR Determines minimum time interval between end of write data burst and the start of a pre-charge command. Allows sense amplifiers to restore data to cell. ▶ tWTR Determines minimum time interval between the end of write data burst and the start of a column-read command; allows I/O gating to overdrive sense amplifies before read command starts. ▶ tRRD Specifies the active-to-active delay of different banks. ▶ tRTP Time interval between a read and a precharge command. ▶ tFAW This item is used to set the tFAW (four activate window delay) timing. ▶ tWCL This item is used to set the tWCL (Write CAS Latency) timing. ▶ tCKE This item is used to set the Pulse Width for DRAM module. ▶ tRTL This item is used to set Round Trip Latency settings. ▶ tXP Exit Power Down with DLL on to any valid command; Exit Precharge Power Down with DLL frzon to commands not requiring a locked DLL. ==Advanced Timing Configuration== Follwing items are used to set the read/ write timings for memory. ▶ tRRDR Read-Read Different Rank, same DIMM. ▶ tRRDD Read-Read Different Rank. ▶ tWWDR Write-Write Different Rank, same DIMM. ▶ tWWDD Write-Write Different Rank. ▶ tRWDRDD Read-Write Different Ranks same or Different DIMM. 2-12