Motorola MVME177P, Installation And Use Manual

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2-1
2
2 Startup and Operation
Introduction
This chapter supplies information on powering up the MVME177P Single-
Board Computer after its installation in a system, and describes the
functionality of the switches, status indicators, and I/O ports.
For programming information, consult the MVME1X7P Single Board
Computers Programmer’s Reference Guide, listed under “Related
Documentation” in Appendix E.
Front Panel Switches and Indicators
There are two switches
(ABORT
and
RESET
) and eight LEDs (
FAIL, STAT,
RUN, SCON, LAN, +12V
[LAN power]
, SCSI, and VME
) located on the
MVME177P front panel.
Table 2-1. MVME177P Front Panel Controls
Control/Indicator Function
Abort Switch ( ABORT ) Sends an interrupt signal to the processor. The interrupt is normally
used to abort program execution and return control to the debugger
firmware located in the MVME177P EPROMs.
The interrupter connected to the Abort switch is an edge-sensitive
circuit, filtered to remove switch bounce.
Reset Switch ( RESET ) Resets all onboard devices. Also drives a SYSRESET
∗
signal if the
MVME177P is system controller. SYSRESET
∗
signals may be
generated by the Reset switch, a power-up reset, a watchdog timeout,
or by a control bit in the Local Control/Status Register (LCSR) in the
VMEchip2 ASIC. For further details, refer to Chapter 4,
Functional
Description .
FAIL LED (DS1, red) Board failure. Lights if a fault occurs on the MVME177P board.
STAT LED (DS2, amber) CPU status. Lights if the processor enters a halt condition.
RUN LED (DS3, green) CPU activity. Indicates that one of the local bus masters is executing
a local bus cycle.