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System Description,
Cache Memory The Apollo Pentium PCI motherboard supports 256 KB or 512 KB of L2 secondary cache memory. External
cache memory is Write-through/Write-back. Asynchronous cache memory is supported. 3-2-2-2 and 4-3-3-3
Burst Read/Write is supported with asynchronous secondary cache memory.
The Pentium CPU includes 16 KB of L1 internal cache memory. Internal cache memory is Write-back/Write-
through.
Cache Memory Type
Cache Memory Size
L1 Internal
L2 Secondary
L2 Secondary
Cache Access Times
The access times for L2 secondary cache memory are:
Host Clock Rate
50 MHz
60 MHz
66.66 MHz
CMOS RAM
The Apollo Pentium PCI motherboard has 128 bytes of nonvolatile CMOS RAM (NVRAM) to store
system configuration information.
Real Time Clock The Apollo motherboard has a real time clock and CMOS RAM powered by an onboard 3V Lithium battery.
The battery on the motherboard can explode if improperly installed. Handle
the battery according to the battery manufacturer's instructions. Use only the
recommended type of battery. Discard used batteries according to the battery
manufacturer's instructions.
Chapter 1 Overview
Continued
Maximum System
Memory Cached
16 KB
256 KB
512 KB
Asynchronous SRAM Access Time
15 ns
15 ns
15 ns
Important
3
128 MB
64 MB
128 MB
Cont'd
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