ASROCK H470M-STX User Manual page 41

Four Activate Window (tFAW)
The time window in which four activates are allowed the same rank.
CAS Write Latency (tCWL)
Configure CAS Write Latency.
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.
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