Chapter 4
4-10
performance. Setting to By SPD enables DRAM CAS# Latency automatically to
be determined by BIOS based on the configurations on the SPD (Serial Pres-
ence Detect) EEPROM on the DRAM module.
Bank Interleave
This field selects 2-bank or 4-bank interleave for the installed SDRAM. Disable
the function if 16MB SDRAM is installed. Settings:
Disabled
,
2-Bank
and
4-
Bank
.
Precharge to Active (Trp)
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 accumu-
late 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: [2T], [3T], [4T], [5T].
TRAS Non-DDR400/DDR400
This setting determines the time RAS takes to read from and write to a memory
cell. Setting options: [6T/8T]. [7T/10T], [5T/6T], [8T/12T].
Active to CMD (Trcd)
W hen 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 (column address strobe). The less the clock
cycles, the faster the DRAM performance. Settings: [2T], [3T], [4T], [5T].
DRAM Burst Length
This setting allows you to set the size of Burst-Length for DRAM. Bursting
feature is a technique that DRAM itself predicts the address of the next memory
location to be acc essed after the first address is acc essed. To use the
feature, you need to define the burst length, which is the actual length of burst
plus the starting address and allows internal address counter to properly
generate the next memory location. The bigger the size, the faster the DRAM
performance. Settings:
4
and
8
.
DRAM Command Rate
This setting controls the DRAM command rate. Select [1T Command] allows
DRAM singlal controller to run at 1T (T=clock cycles) rate. Select [2T Command]
makes DRAM siganl controller run at 2T rate. [1T] is faster than [2T]. Setting
options: [1T Command], [2T Command].
Содержание Midas 400
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