DFI AM636-B - Manual (Page 89)

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BIOS Setup
DRAM RAS# to CAS# Delay
This field is used to select the latency between the DRAM active command
and the read/write command. The options are 2 and 3.
Bank to Bank Cmd (TRRD)
The options are Auto, 2 CLK to 5 CLK.
TRC
Row-Cycle delay. Set the “System Performance” field to Optimal if you want
to use the delay time recommended by the DIMM manufacturer.
TRFC 0 to TRFC 3
These fields are used to select the auto refresh cycle time.
CS/ODT Pin Fine Delay
The options are Enabled and Disabled.