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User’s Manual
ESM-2850 User’s Manual
51
3.5.3.3 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. Naturally, reducing the delay improves the performance of the SDRAM
while increasing it reduces performance.
The choices: Auto, 2, 3, 4, 5.
3.5.3.4 DRAM RAS# Precharge
This option sets the number of cycles required for the RAS to accumulate its charge before
the SDRAM refreshes. Reducing the precharge time to 2 improves SDRAM performance
but if the precharge time of 2 is insufficient for the installed SDRAM, the SDRAM may not
be refreshed properly and it may fail to retain data
So, for better SDRAM performance, set the SDRAM RAS Precharge Time to 2 but
increase it to 3 if you face system stability issues after reducing the precharge time.
The choices: Auto, 2, 3, 4, 5.
3.5.3.5 Precharge Delay (tRAS)
The Active to Precharge timing controls the length of the delay between the activation and
precharge commands -- basically how long after activation can the access cycle be started
again. This influences row activation time which is taken into account when memory has hit
the last column in a specific row, or when an entirely different memory location is
requested.
The choices: Auto, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15.
3.5.3.6 System Memory Frequency
This item is to determine the maximum performance and reliability of memory.
The choices: Auto, 333MHz, 400MHz, 533MHz.
3.5.3.7 System BIOS Cacheable
This feature is only valid when the system BIOS is shadowed. It enables or disables the
caching of the system BIOS ROM at F0000h-FFFFFh via the L2 cache. This greatly
speeds up accesses to the system BIOS. However, this does not translate into better
system performance because the OS does not need to access the system BIOS much.
The choices: Disabled, Enabled.
3.5.3.8 Video BIOS Cacheable
This feature is only valid when the video BIOS is shadowed. It enables or disables the
caching of the video BIOS ROM at C0000h-C7FFFh via the L2 cache. This greatly speeds
up accesses to the video BIOS. However, this does not translate into better system
performance because the OS bypasses the BIOS using the graphics driver to access the
video card's hardware directly.
The Choice: Enabled, Disabled.