Owner's Manual

2-12
BIOS Setup
MS-7737
Chapter 2
BIOS Setup
MS-7737
Chapter 2
tRP
Controls number of cycles for RAS (row address strobe) to be allowed to pre-charge.
If nsucent tme s allowed for RAS to accumulate before DRAM refresh, the DRAM
may fal to retan data. Ths tem apples only when synchronous DRAM s nstalled
n the system.
tRAS
Determnes the tme RAS (row address strobe) takes to read from and wrte to mem
-
ory cell.
tRFC
Ths settng determnes the tme RFC takes to read from and wrte to a memory
cell.
tWR
Determnes mnmum tme nterval between end of wrte data burst and the start of a
pre-charge command. Allows sense amplers to restore data to cell.
tWTR
Determnes mnmum tme nterval between the end of wrte data burst and the start
of a column-read command; allows I/O gatng to overdrve sense amples before
read command starts.
tRRD
Speces the actve-to-actve delay of derent banks.
tRTP
Tme nterval between a read and a precharge command.
tFAW
Ths tem s used to set the tFAW (four actvate wndow delay) tmng.
tWCL
Ths tem s used to set the tWCL (Wrte CAS Latency) tmng.
tCKE
Ths tem s used to set the Pulse Wdth for DRAM module.
tRTL
Ths tem s used to set Round Trp Latency settngs.
tXP
Ext Power Down wth DLL on to any vald command; Ext Precharge Power Down
wth DLL frozen to commands not requrng a locked DLL.
==Advanced Tmng Conguraton==
Follwng tems are used to set the read/ wrte tmngs for memory.
tRRDR
Read-Read Derent Rank, same DIMM.
tRRDD
Read-Read Derent Rank.
tWWDR
Wrte-Wrte Derent Rank, same DIMM.
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