MOTOROLA MVME162-512A Embedded Controller

The MVME162 provides +5 Vdc power to the remote LED/switch connector

(J4) through a 1A fuse (F1) located near J4.  Connector J4 is the interface for a

remote control and indicator panel.  If none of the LEDs light and the ABORT

and RESET switches do not operate, check fuse F1.

The MVME162 provides +12 Vdc power to the Ethernet transceiver interface

through a 1A fuse (F2) located near diode CR1.  The FUSE LED lights to indicate

that +12 Vdc is available.  When the MVME712M module is used, the yellow

DS1 LED on the MVME712M illuminates when LAN power is available, which

indicates that the fuse is good. If the Ethernet transceiver fails to operate, check

fuse F2.

The MVME162 provides SCSI terminator power through a 1A fuse (F1) located

on the P2 Adapter Board or LCP2 Adapter Board.  If the fuse is blown, the SCSI

device(s) may function erratically or not at all.  When the P2 Adapter Board is

used with an MVME712M and the SCSI bus is connected to the MVME712M,

the green DS2 LED on the MVME712M front panel illuminates when SCSI

terminator power is available.  If the green DS2 LED flickers during SCSI bus

operation, check P2 Adapter Board fuse F1

Other MPUs on the VMEbus can interrupt, disable, communicate with, and

determine the operational status of the processor(s).  One register of the GCSR

(global control/status register) set includes four bits that function as location

monitors to allow one MVME162 processor to broadcast a signal to any other

MVME162 processors.  All eight registers are accessible from any local

processor as well as from the VMEbus

Introduction

This chapter provides information necessary to use the MVME162 in a system

configuration.  This includes a description of the switches and LEDs, memory

maps, and software initialization of the module.

Switches and LEDs

The MVME162 front panel has ABORT and RESET switches and eight LED

(light-emitting diode) indicators (FAIL, STAT, RUN, SCON, LAN, FUSE, SCSI,

VME).

ABORT Switch (S1)

When enabled by software, the ABORT switch generates an interrupt at a user

programmable level.  It is normally used to abort program execution and

return to the 162Bug debugger firmware located in the MVME162 EPROM

and Flash memory.

The ABORT switch interrupter in the MCchip ASIC is an edge-sensitive

interrupter connected to the ABORT switch.  This interrupter is filtered to

remove switch bounce.

RESET Switch (S2)

The RESET switch resets all onboard devices; it also drives SYSRESET* if the

MVME162 is the system controller.  The RESET switch may be disabled by

software.

The VMEchip2 includes both a global and a local reset driver.  When the

VMEchip2 operates as the VMEbus system controller, the reset driver

provides a global system reset by asserting the VMEbus signal SYSRESET*.  A

SYSRESET* may be generated by the RESET switch, a power-up reset, a

watchdog timeout, or by a control bit in the LCSR in the VMEchip2.  SYSRESET*

remains asserted for at least 200 ms, as required by the VMEbus specification.

Similarly, the VMEchip2 provides an input signal and a control bit to initiate

a local reset operation.  By setting a control bit, software can maintain a board

in a reset state, disabling a faulty board from participating in normal system

operation.  The local reset driver is enabled even when the VMEchip2 is not the