ASROCK Intel W790 Series Software Setup Manual page 32

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.
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