Lenovo 6300, User Manual

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4-8 Chapter 4: BIOS Setup
Item Options Description
SDRAM Cycle
Time Tras/Trc
5/7
6/8 Specifies the timing spec of
SDRAM.
SDRAM
RAS-to-CAS
Delay
3
2
This item specifies the length of
the delay inserted between
RAS(Row Address Strobe)and
CAS(Column Address Strobe)
signal of the DRAM system
memory access cycle.
SDRAM RAS
Precharge Time
3
2
This item specifies the length of
the RAS precharge part of the
DRAM system memory access
cycle when synchronous DRAM
system memory is installed in the
computer.
System BIOS
Cacheable
Video BIOS
Cacheable
Enabled
Disabled If cache controller is enabled,
enabling these causes video BIOS
cache at C0000H-C7FFFH or
system BIOS ROM at
F0000H-FFFFFH to be cached for
faster execution.
Memory Hole At
15M-16M
Disabled
15M-16M ‘Enabled’ makes 15M-16M area
reserved for ISA use. (Some ISA
cards may require specific areas
of memory in order to function.)
CPU Latency
Timer
Enabled
Disabled Enables or disables this feature.
Delayed
Transaction
Enabled
Disabled Selects ISA device speed.
‘Enabled’ is for slow speed ISA
device in system.
OnChip Video
Window Size
-- Displays the window size of video
controller.
Local Memory
Frequency
100Mhz
133MHz Sets display cache at 100Mhz or
133MHz.
Initial Display
Cache
Enabled
Disabled The onboard video includes a
4MB onboard display cache.
‘Enabled’ utilizes this cache.
CAS# Latency 2
3 This item regulates the column
address strobe.
Paging Mode
Control
Close
Open Sets the Paging mode control
when ‘Initial Display Cache’ is
enabled.
RAS-to-CAS
Override
By CAS# LT
Override(2) Specifies the interval between
refresh signals to DRAM system
memory when ‘Initial Display
Cache’ is enabled.
RAS# Timing Slow
Fast Regulates the speed of row
address strobe when ‘Initial
Display Cache’ is enabled.
RAS# Precharge
Timing
Slow Fast Sets the precharge timing of row
address strobe when ‘Initial
Display Cache’ is enabled.