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Introduction
This chapter provides the necessary information to use the MVME197DP/SP
VMEmodule in a system configuration. This includes controls and indicators,
memory maps, and software initialization of the module.
Controls and Indicators
The MVME197 Single Board Computer has two push-button switches
(ABORT and RESET) and six LED (Light Emitting Diode) indicators (FAIL,
SCON, RUN, LAN, VME, and SCSI), all located on the front panel of the
module.
ABORT Switch S2
When enabled by software, the front panel ABORT switch (S2) can generate a
non-maskable type interrupt to CPU0 via the NMI* signal. It is normally used
to abort program execution and return to the 197Bug debugger. This capability
is controlled via the ABORT register in the BusSwitch. Refer to the BusSwitch
chapter of the MVME197LE, MVME197DP, and MVME197SP Single Board
Computers Programmer's Reference Guide for more information.
RESET Switch S3
The RESET switch (S3) will reset all the onboard devices and drive the
SYSRESET* signal if the MVME197 module is the system controller. The
RESET switch (S3) will reset all the onboard devices, with the exception of the
DCAM and ECDM, if the MVME197 module is not the system controller. The
VMEchip2 generates the SYSRESET* signal. The BusSwitch combines the
VMEchip2 local reset, the power up reset, and the reset switch to generate a
local board reset. Refer to the Reset Module section in the BusSwitch chapter of
the MVME197LE, MVME197DP, and MVME197SP Single Board Computers
Programmer's Reference Guide for more information.
The BusSwitch receives the reset switch signal, debounces it and combines it
with the reset signal from the VMEchip2 to generate a board reset signal.
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
MVME197/D1
OPERATING
INSTRUCTIONS
3
3-1
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