ASRock W790 WS Software/BIOS Setup Guide - Page 32
Fourth Timing, tPRPDEN, tRDPDEN, tWRPDEN, tSTAGGER_Ref, tWRPRE, tWRRDA, tCPDED
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tCKE Configure the period of time the DDR4 initiates a minimum of one refresh command internally once it enters Self-Refresh mode. tRC Configure the minimum active to active/Refresh Time. Fourth Timing tPRPDEN Configure tPRPDEN. tPRPDEN, tACTPDEN, tREFPDEN will use this single value. tXP Configure tXP. CKE low exit time before a new command can be sent after CKE comes up tRDPDEN Configure tRDPDEN. CASrd to CKE low time. tWRPDEN Configure tWRPDEN. CASwr to CKE low time. tSTAGGER_Ref Configure tSTAGGER_Ref. Limits the rate of refresh commands sent to a single channel. tRDA Configure tRDA. Read CAS w/AutoPrecharge to Activate delay. tWRA Configure tWRA. Write CAS w/AutoPrecharge to Activate delay. tWRPRE Configure tWRPRE. Write CAS to Precharge delay. tWRRDA Configure tWRRDA. Write CAS to Read CAS with AutoPrecharge delay. tMRD Configure tMRD. DDR tMRD timing parameter. MRS to MRS minimum delay in number of DCLK. tCPDED Configure tCPDED. This is the tCPDED parameter, only used with DDR5. 28