Intel 281786-002 manual Board Level Features, Cpu, Performance Upgrade, Second Level Cache

Board Level Features

A − Two PCI IDE interfaces

B − National 87306 I/O controller C − Primary power connector

D − Four SIMM sockets (two banks) E − 82438FX Triton Data Path (TDP) F − Parallel port connector

G − Floppy drive connector H − 256KB Secondary cache

I − 82437FX Triton System Controller (TSC) J − Socket 5 Pentium processor socket

K− CPU voltage regulator

L − Front Panel I/O connectors M − Configuration switch block

N − 82371FB PCI ISA/IDE Accelerator (PIIX) O − Battery for the Real-time clock

P − Four ISA expansion connectors Q − BIOS recovery boot jumper

R − Flash EEPROM for system BIOS S − Three PCI expansion connectors T − 3.3 volt power connector for PCI U − Serial port connectors

V − AT Keyboard Connector

(Optional PS/2 style Keyboard and Mouse connectors may be available)

A B C D E F G H

V

U

T

PIN 1

S

R

Q

PO N M

I

J

K

L

Figure 2. Advanced/ZP Board Level Features

CPU

The Advanced/ZP baseboard is designed to operate with 3.3 volt Pentium processors. A patented on-board voltage regulator circuit provides the required 3.3 volts from the 5 volt tap provided by a standard PC power supply. The baseboard supports the Pentium processors at iCOMP™ index 610 \ 75 MHz, 735 \ 90 Mhz, 815 \ 100 Mhz, and 1000 \ 120 Mhz. The Pentium processor is backward-compatible with the 8086, 80286, i386™ and i486™ CPUs. It supports both read and write burst mode bus cycles, and includes separate 8K on-chip code and data caches which employ a write-back policy. Also integrated into the Pentium processor is an advanced numeric coprocessor which significantly increases the speed of floating point operations, while maintaining backward compatibility with i486DX math coprocessor and complying to ANSI/IEEE standard 754-1985.

All Advanced/ZP baseboards support the 75 MHz and 90 MHz processors. The matrix below shows which Printed Board Assemblies (PBA number found on the baseboard) also support the 100 MHz or 120 MHz processor.

Processor Speed	Supported by PBA Numbers:
75 MHz	All PBAs
90 MHz	All PBAs
100 MHz	PBA 638995, PBA 641525, PBA 639379
120 MHz	Suffixes -606, -607, -806, -807, -808 and above
	Table 1. Processor support

PERFORMANCE UPGRADE

A 320-pin Type 5 Zero Insertion Force socket provides users with a performance upgrade path to future, higher speed, Pentium® processors. An OverDrive processor being developed for use with this socket will provide performance beyond that delivered by the originally installed Pentium processor.

SECOND LEVEL CACHE

The Pentium processor's internal cache is complemented by 256 KB direct mapped write-back second level cache. The 256 KB cache configuration is implemented with eight 32kx8 asynchronous SRAM devices for the cache data and one 32kx8 SRAM for the cache tag. The cache size is set by three configuration jumpers located on the baseboard. This is preset by the factory to support the onboard 256 KB configuration.

Advanced/ZP Technical Product Summary ∙Page 5