IBASE Technology MB880, Руководство пользователя, Страница: 45 / 67

BIOS SETUP
MB880 User’s Manual 41
DRAM RAS# to CAS# Delay
This option allows you to insert a delay between the RAS (Row Address
Strobe) and CAS (Column Address Strobe) signals. This delay occurs
when the SDRAM is written to, read from or refreshed. Reducing the
delay improves the performance of the SDRAM.
DRAM RAS# Precharge
This option sets the number of cycles required for the RAS to accumulate
its charge before the SDRAM refreshes. The default setting for the
Active to Precharge Delay is
3 .
Precharge delay (tRAS)
The default setting for the Active to Precharge Delay is 8 .
System Memory Frequency
This field sets the frequency of the DRAM memory installed. The
default setting is
Auto . The other settings are DDR333,DDR400 and
DDR533 .
SLP_S4# Assertion Width
Pushing the power button for 1 to 2 seconds will power off the
system.This will prevent the system from powering off in case you
accidentally hit or pushed the power button.
System BIOS Cacheable
The setting of Enabled allows caching of the system BIOS ROM at
F000h-FFFFFh, resulting in better system performance. However, if
any program writes to this memory area, a system error may result.
Video BIOS Cacheable
The Setting Enabled allows caching of the video BIOS ROM at
C0000h-F7FFFh, resulting in better video performance. However, if
any program writes to this memory area, a system error may result.
Memory Hole At 15-16M
In order to improve performance, certain space in memory can be
reserved for ISA cards. This memory must be mapped into the memory
space below 16 MB. The choices are
Enabled and Disabled .
PEG/OnChip VGA Control
The default setting is Auto .