17
2 System Board
Devices on the Processor-Local Bus
The computer may execute erratically, if at all, or may overheat, if it is
configured to operate at a higher processor speed than the processor is
capable of supporting. This can cause damage to the computer.
Setting the switches to operate at a slower speed than the processor is
capable of supporting can still cause erratic behavior in some cases, and
would reduce the instruction throughput in others.
Cache Memory
There are two types of integrated circuits sealed within a single Pentium II
package. One of these constitutes the Level-2 (L2) cache memory; the other
is the processor, which itself includes two banks of Level-1 (L1) cache
memory.
The L1 cache memory has a total capacity of 32KB (16 KB data, 16 KB
instruction). The L2 cache memory has a capacity 512 KB, and is composed
of four-way set-associative static RAM. Data is stored in lines of 32-bytes
(256 bits). Thus two consecutive 128-bit transfers with the main memory
are involved for each transaction.
The amount of cache memory is set by Intel at the time of manufacture, so
cannot be changed.
1.
The PCI bus frequency is 33 MHz and the ISA bus frequency is
8.33 MHz.
2.
UP=OFF, DOWN=ON
Processor Frequency
1
Switch Number 233 MHz 266 MHz 300 MHz 333 MHz 366 MHz
1
UP
2
UP UP UP UP
2
DOWN DOWN DOWN DOWN DOWN
3
DOWNUPUPUPUP
4
UP DOWN DOWN UP UP
5
UP DOWN UP DOWN UP
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