PT-5IH
SYSTEM BOARD
HARDWARE SETUP
4.2.2 L2 CACHE MEMORY INSTALLATION
The PT-5IH system board will support one or two bank(s) direct-mapped second level cache and provides either
256KB or 512KB cache memory using synchronous pipeline-burst SRAMs. (
Note that this system board does
not support asynchronous or burst SRAMs for the cache memory
) Both Write Back and Write Through cache
update policy are supported.
If the on-board cache memory size is 256KB, a COAST (Cache-On-A-STick) module (256KB) will be use for
upgrade the cache memory size from 256KB to 512KB. There is no jumper needed for end-user while upgrade
cache memory size, just insert the COAST module into the SRAM module slot (CN11), then the cache memory
size will be detected by system BIOS automatically.
Note : The COAST modules design must comply with Intel COAST (Cache-On-A-STick)
module specification revision 2.0 or later.
The following table lists the detalied combination about cache memory installation.
Cache
Data SRAMs
Tag SRAMs
COAST
Size
U5 ,U7
U2 (or U1)
U4 (or U3)
SRAM module
(optional)
(CN11)
256 KB
32KB
x
32
8KB or 16KB or 32KB
x
8 8KB or 16KB or 32KB
x
8
Empty
512 KB
32KB
x
32
8KB or 16KB or 32KB
x
8 8KB or 16KB or 32KB
x
8
256 KB
512 KB
64KB
x
32
16KB or 32KB
x
8
16KB or 32KB
x
8
Empty
This system board supports the memory space cacheability limit for the second level cache is 64MB of main
memory base, and also supports an optional extended memory space cacheability limit of 512MB, but for this
feature an additional Tag SRAM ( TAG1, U4 or U3) is needed. (
Note that the specification of the additional
Tag SRAM must same as TAG 0
). Insert a SRAM into TAG1, then execute the CMOS setup procedure change
the "L2 Cache Cacheable Size" item (in the CHIPSET FEATURE SETUP) from 64MB to 512 MB. (Please
refer to Chapter 5)
The following table shows the sizes and quantities of Tag SRAM needed to support different memory sizes of
cacheability.
Cache Size
TAG Size
Memory size of
TAG 0 (U2 or U1)
TAG 1 (U4 or U3)
Cacheability
256 KB
8KB or 16KB or 32KB
x
8
Empty
64 MB
256 KB
8KB or 16KB or 32KB
x
8
8KB or 16KB or 32KB
x
8
512 MB
512 KB
16KB or 32KB
x
8
Empty
64 MB
512 KB
16KB or 32KB
x
8
16KB or 32KB
x
8
512 MB
4-3
