Operating Instructions; Introduction; Controls And Indicators; Abort Switch S1 - Motorola MVME167 Series User Manual

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Introduction

This chapter provides necessary information to use the MVME167 module in a system
configuration. This includes controls and indicators, memory maps, and software
initialization of the module.

Controls and Indicators

The MVME167 module has ABORT and RESET switches; and FAIL, STAT, RUN,
SCON, LAN,+12V (LAN power), SCSI, and VME indicators; all located on the front
panel of the module.

ABORT Switch S1

When enabled by software, the front panel ABORT switch generates an interrupt at a
user-programmable level. It is normally used to abort program execution and return to
the 167Bug debugger firmware located in the MVME167 EPROMs.
The ABORT switch interrupter in the VMEchip2 is an edge-sensitive interrupter
connected to the ABORT switch. This interrupter is filtered to remove switch bounce.

RESET Switch S2

The front panel RESET switch resets all onboard devices, and drives SYSRESET* if
the board is system controller. The RESET switch may be disabled by software.
The VMEchip2 includes both a global and a local reset driver. When the chip 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.
SYSRESET* remains asserted for at least 200 msec, 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 system controller. A local reset
may be generated by the RESET switch, a power up reset, a watchdog timeout, a
VMEbus SYSRESET*, or a control bit in the GCSR.

Front Panel Indicators (DS1 - DS4)

There are eight LEDs on the MVME167 front panel: FAIL, STAT, RUN, SCON,
LAN, +12V (LAN power), SCSI, and VME.
MVME167/D33-1
OPERATING
INSTRUCTIONS
3

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