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Board Level Hardware Description
1
Functional Description
This section contains a functional description of the MVME162LX
Embedded Controller.
Switches and LEDs
The controller’s front panel has an
ABORT
and
RESET
switch and four
light-emitting diode (LED) indicators (
FAIL
,
RUN
,
SCON
,
FUSES
).
ABORT Switch
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 controller’s
EPROMs 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
Note:
For an MVME162LX without the VMEbus option (no
VMEchip2), the LCSR control bit is not available to reset the
module. In this case, the watchdog timer is allowed to time out
to reset the controller.
The
RESET
switch resets all onboard devices; it also drives SYSRESET*
if the MVME162LX is operating as 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 (local
control/status register) in the VMEchip2. SYSRESET* remains asserted
for at least 200 msec, as required by the VMEbus specification.
Содержание MVME162LX 200 Series
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Страница 84: ...2 18 Computer Group Literature Center Web Site Hardware Preparation and Installation 2 ...
Страница 108: ...3 24 Computer Group Literature Center Web Site Debugger General Information 3 ...
Страница 156: ...IOT Command Parameters for Supported Floppy Types B 6 Computer Group Literature Center Web Site B ...
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Страница 164: ...Ethernet Interconnections E 2 Computer Group Literature Center Web Site E ...
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