User`s manual

3-12
BIOS Setup
MS-7640
Chapter 3
BIOS Setup
MS-7640
Chapter 3
DRAM Frequency
Ths tem s used to adjust the DRAM frequency. Settng to [Auto], the system wll detect
the DRAM Frequency automatcally.
Adjusted DRAM Frequency
It shows the adjusted Memory frequency. Read-only.
DRAM Tmng Mode
Ths eld has the capacty to automatcally detect the DRAM tmng.
Advanced DRAM Conguraton
Press <Enter> to enter the sub-menu.
Command Rate
Ths settng controls the DRAM command rate.
tCL
Ths controls the CAS latency, whch determnes the tmng delay (n clock cycles)
before SDRAM starts a read command after recevng t.
tRCD
When DRAM s refreshed, both rows and columns are addressed separately. Ths
setup tem allows you to determne the tmng of the transton from RAS (row address
strobe) to CAS (column address strobe). The less the clock cycles, the faster the
DRAM performance.
tRP
Ths settng controls the number of cycles for Row Address Strobe (RAS) to be
allowed to precharge. If nsucent tme s allowed for the RAS to accumulate ts
charge before DRAM refresh, refreshng may be ncomplete and DRAM may fal
to retan data. Ths tem apples only when synchronous DRAM s nstalled n the
system.
tRAS
Ths settng determnes the tme RAS takes to read from and wrte to memory cell.
tRTP
Tme nterval between a read and a precharge command.
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