ASROCK Z790 Series Setup Manual page 42

Read to Precharge (tRTP)
The number of clocks that are inserted between a read command to a row pre-charge
command to the same rank.
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.
tRC
Configure the minimum active to active/Refresh Time.
Turn Around Timing
Turn Around Timing Optimization
Auto is enabled in general case.
Configuration options: [Auto] [Enabled] [Disabled]
TAT Training Value
tRDRD_sg
Configure between module read to read delay.
Configuration options: [Auto] [0] - [127]
tRDRD_dg
Configure between module read to read delay.
Configuration options: [Auto] [0] - [127]
tRDRD_dr
Configure between module read to read delay.
Configuration options: [Auto] [0] - [255]
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