Technical data

A-1
DIGITAL Server 3220/3220R
8
Block Diagram
A
Main Logic Board
This appendix describes the DIGITAL Server 3220/3220R Main Logic Board (MLB)
block diagram, shown in Figure A-1. The MLB integrates the Dual Pentium II
processors with both ISA and PCI system peripheral devices. The MLB provides the
following functions:
•
Connector for a dual Pentium II CPU/Memory module with 350 MHz or 400 MHz
processors, the BX chipset, and registered SDRAM DIMMs up to 1GB.
•
BIOS ROM
•
System I/O for PC-compatible serial (2), parallel, keyboard, USB (2), and serial mouse
ports
•
Diskette drive connector
•
IDE connector to the IDE CD-ROM
•
SCSI Interface: Channel A with wide Ultra SCSI connection to the “hot-swap” storage
backplane; Channel B with Ultra2 SCSI capability for an optional external expansion
box
•
Six PCI expansion slots, including one shared with an ISA expansion slot
•
Two ISA expansion slots, including one shared with a PCI slot
•
A proprietary slot for the combination Video/Ethernet controller
•
System management to monitor fans, voltages, and temperatures.
The sections that follow provide a brief overview of the MLB block diagram.