Giantec GT-650, Руководство пользователя

Страница: 29 / 111

User’s Manual
GT-650 BIOS Setup 4 - 14
SDRAM CAS Latency Time
When synchronous DRAM is installed, the number of clock cycles of CAS
latency depends on the DRAM timing.
The Choice: 2, 3
SDRAM Cycle Time Tras/Trc
Select the number of SCLKs for an access cycle.
The Choice: 5/7, 7/9.
SDRAM RAS-to- CAS Delay
This field let’s you insert a timing delay between the CAS and RAS strobe
signals, used when DRAM is written to, read from, or refreshed.
Fast gives
faster performance; and Slow gives more stable performance. This field
applies only when synchronous DRAM is installed in the system.
The Choice: 2, 3.
SDRAM RAS Precharge Time
If an insufficient number of cycles is allowed for the RAS to accumulate its
charge before DRAM refresh, the refresh may be incomplete and the DRAM
may fail to retain data.
Fast gives faster performance; and Slow gives more
stable performance. This field applies only when synchronous DRAM is
installed in the system.
The Choice: 2, 3.
System BIOS Cacheable
Selecting Enabled allows caching of the system BIOS ROM at
F0000h-FFFFFh, resulting in better system performance. However, if any
program writes to this memory area, a system error may result.
The choice: Enabled, Disabled.
Video BIOS Cacheable
Select Enabled allows caching of the video BIOS, resulting in better system
performance. However, if any program writes to this memory area, a system
error may result.
The Choice: Enabled, Disabled.