AMI BIOS Setup
3-13
SDRAM RAS# Precharge
This setting controls the number of cycles for Row Address Strobe
(RAS) to be allowed to precharge. If insufficient time is allowed for the
RAS to accumulate its charge before DRAM refresh, refresh may be
incomplete and DRAM may fail to retain data. This item applies only
when synchronous DRAM is installed in the system. Setting options:
3 Clocks, 2 Clocks
.
SDRAM RAS# to CAS# Delay
When DRAM is refreshed, both rows and columns are addressed
separately. This setup item allows you to determine the timing of the
transition from RAS (row address strobe) to CAS (colume address
strobe). The less the clock cycles, the faster the DRAM performance.
Settings:
3 Clocks, 2 Clocks
.
SDRAM Precharge Delay
This setting controls the precharge delay, which determines the timing
delay for DRAM precharge. Setting options:
7 Clocks, 6 Clocks, 5
Clocks
.
SDRAM Idle Timer
This field determines the number of clocks the DRAM controller will remain in
the idle state before it begins precharging all pages. Settings:
Infinite, 0 Clock,
8 Clocks, 16 Clocks, 64 Clocks
.
Memory Hole
In order to improve performance, certain space in memory can be reserved for
ISA peripherals. This memory must be mapped into the memory space below
16MB. When this area is reserved, it cannot be cached. Settings:
Disabled,
15MB-16MB
.
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