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BIOS Setup

Min RAS# Active Time (Tras)

This field is used to select the minimum time RAS takes to read

from and write to a memory cell.

RAS# to CAS# Delay (Trcd)

When DRAM refreshes, both rows and columns are addressed

separately. This field is used to select the delay time from RAS (Row

Address Strobe) to CAS (Column Address Strobe) when reading

and writing to the same bank. The lesser the clock cycle, the faster

the DRAM’s performance.

Row Precharge Time (Trp)

This field is used to select the number of cycles that is allowed for

Row Address Strobe (RAS) to precharge. If insufficient time is al-

lowed for the RAS to accumulate its charge before DRAM refreshes,

refreshing may be incomplete and DRAM may fail to retain data.

Row to Row Delay (Trrd)

This field is used to select the row to row delay time of different

banks.

Row Cycle Time (Trc)

This field is used to select the row cycle time, RAS# active or auto

refresh of the same bank.

Row Refresh Cyc Time (Trfc)

This field is used to select the row refresh cycle time. Auto refresh

active to RAS# active or RAS# to auto refresh - similar to Trc.

Read to Write Time (Trwt)

This field is used to select the read to write time. Although this is

not a DRAM specified timing parameter, it is related to the routing

latencies on the clock forwarded bus. This is measured from the first

address bus slot which is not associated with part of the read burst.

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DFI LanParty nF4 User Manual Page 100