Shuttle XPC User Manual page 20

DRAM Timing Control
This item allows you to select the value in this field, depending on
whether the board using which kind of DDR DRAM.
Ø The Choice: Auto or Manual.
RAS to CAS Delay(tRCD)
Ø The Choice: 2T, 3T, 4T or 5T.
Precharge Time(tRP)
Ø The Choice: 2T, 3T, 4T or 5T.
RAS Active Time(tRAS)
Ø The Choice: 4T~15T.
Write Recovery Time(tWR)
Ø The Choice: 1T~6T.
DDR2 Additive Latency(tAL)
Ø The Choice: 0T~4T.
Performance Mode
This item allows you to enable/disable the performance mode.
Ø The Choice: Enabled, or Disabled.
System BIOS Cacheable
Selecting Enabled allows caching for the system BIOS ROM at F0000h-
FFFFFh, resulting in better system performance. However, if any program
is written to this memory area, a system error may result.
Ø The Choice: Enabled or Disabled.
Video RAM Cacheable
Selecting Enabled allows caching of the video RAM, resulting in better
system performance. However, if any program is written to this memory
area, a sysem error may result.
Ø The Choice: Enabled or Disabled.
Memory Hole at 15M-16M
You can reserve this area of system memory for ISA adapter ROM. When
this area is reserved, it cannot be cached. The user information of periph-
erals that need to use this area of system memory ususlly discusses their
memory requirements.
Ø The Choice: Enabled or Disabled.
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