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8 ASUS P/I-XP55T2P4 User’s Manual
III. INSTALLATION
(Jumpers)
III. INSTALLATION
3. Memory Cacheable Size (JP15)
The default of 64MB uses only the onboard TAG SRAM which allows cacheable
memory up to 64MB. If you install DRAM above 64MB and wish to allow
cacheable memory above 64MB, you need to install a TAG SRAM upgrade or
use a cache module with an extended TAG SRAM (such as 256KB ASUS CM1
Rev 3.0 with 2 TAG SRAM's) but not both and set this jumper to 512MB. See
page 12 for TAG SRAM upgrade and page 14 for cache module information.
WARNING: If there are DRAM cache chips (MCache) either onboard or on
the SIMM cache module instead of pipelined burst SRAM chips, this jumper
must be set to 64MB. 512MB will make the system unstable. Mcache chips
can only allow cacheable memory up to 64MB. See "Map of Motherboard" on
page 4 for L2 cache locations. If the cache module that you install already
have an extended tag, do not install another TAG SRAM into the TAG SRAM
Upgrade Socket.
Cacheable Size JP15
64MB (BSRAM/MCache) [1-2] (Default)
512MB (BSRAM Only) [2-3]
Memory Cacheable Size (64MB/512MB)
512MB Cacheable
Burst SRAM Only
JP15
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JP15
64MB Cacheable (Default)
Burst SRAM or MCache
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4. Onboard Multi-I/O Selection (JP16)
You can selectively disable each onboard Multi-I/O item (floppy, serial, paral-
lel, and IrDA) through BIOS (see pages 35 & 36) or disable all Multi-I/O items
at once with the following jumper in order to use your own Multi-I/O card.
Selections JP16
Enable [1-2] (Default)
Disable [2-3]
Multi I/O Setting (Enable / Disable)
Enable (Default) Disabled
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JP16
JP16