Service manual

Service Manual
Part 1 - System description
Introduction
The workstation is built around the ARM chip set,
comprising the Acorn"RISC Machine (ARM) itself, the
Memory Controller (MEMC), Video Controller (VIDC) and
Input Output Controller (IOC).
The ARM CPU is fitted on a daughter card. Additionally,
memory expansion cards are available, each with 4MB of
RAM and a MEMC controller.
A block diagram of the workstation is shown below:
Fig 1-1: Block diagram of workstation
General
The ARM3 CPU is a pipelined, 32-bit reduced
instruction set microprocessor which accepts
instructions and manipulates data via a high speed 32-
bit data bus and 26-bit address bus, giving a 64 MB
uniform address space. it supports virtual memory
systems using a simple instruction set with good high-
level language compiler support. The ARM3 version has
4KB of on-chip cache memory, which greatly increases
data handling speeds (typically 2 - 3 times faster than
ARM2).
Part 1 - System description Issue 2, June 1991 1-1