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990XA-GD55
Инструкция по эксплуатации Страница: 38

MSI 990XA-GD55 [38/138] Ms 7640 ma nboard

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MS-7640 Manboard

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.

tRC

The row cycle tme determnes the mnmum number of clock cycles a memory row

takes to complete a full cycle, from row actvaton up to the prechargng of the actve

row.

tWR

Mnmum tme nterval between end of wrte data burst and the start of a precharge

command. Allows sense amplers to restore data to cells.

tRRD

Speces the actve-to-actve delay of derent banks.

tWTR

Mnmum tme nterval between the end of wrte data burst and the start of a column-

read command. It allows I/O gatng to overdrve sense amplers before read

command starts.

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MSI 990XA-GD55 [38/138] Ms 7640 ma nboard

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