Application Module Hardware Components - Nortel Meridian Meridian 1 Maintenance Manual

4 Chapter 1: Overview

Application Module hardware components

553-3211-510 Standard 1.0 October 1998
The Single Board Computer (SBC) card can be either an
MVME147SA-1 or an MVME167-03. For easier reading, this card will be
referred to as the MVME147/167 card.
The hardware components listed below (see Figures 1 and 2) are field-
replaceable units.
¥ MVME147SA-1 SBC card
This is the main CPU card of the Application Module. There are four
LEDs and two switches on the faceplate of the SBC card:
Ñ The red LED (Fail indicator) is lit when the BRDFAIL bit is set or
when a watchdog time-out occurs. It is normal for this indicator to
flicker while diagnostics are running; when a failure occurs, this
indicator is steadily lit.
Ñ The yellow LED (Status indicator) is lit when the MC68030
STATUS pin is low (when steadily lit, it indicates that the processor
has stopped).
Ñ The green LED (Run indicator) is lit when the microprocessor
executes a bus cycle.
Ñ The green LED (SCON indicator) is lit to indicate that the SBC
card is the VME bus system controller.
Ñ The
ABORT
the debugger.
Ñ The
RESET
SBC card is the system controller, this switch also generates a
VME bus system reset.
!
switch stops program execution and returns control to
switch, when enabled, generates a local reset. If the
CAUTION
Risk of data loss
Do not press both the
the same timeÑyou risk losing device configuration
information.
and buttons at
ABORT RESET