ASROCK Pro Series User Manual page 66

Third Timing
tREFI
Configure refresh cycles at an average periodic interval.
tCKE
Configure the period of time the DDR4 initiates a minimum of one refresh
command internally once it enters Self-Refresh mode.
Turn Around Timing
tRDRD_sg
Configure between module read to read delay.
tRDRD_dg
Configure between module read to read delay.
tRDRD_dr
Configure between module read to read delay.
tRDRD_dd
Configure between module read to read delay.
tRDWR_sg
Configure between module read to write delay.
tRDWR_dg
Configure between module read to write delay.
tRDWR_dr
Configure between module read to write delay.
tRDWR_dd
Configure between module read to write delay.
tWRRD_sg
Configure between module write to read delay.
tWRRD_dg
Configure between module write to read delay.
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