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Board Level Hardware Description
1
The controller pr5 Vdc to the SCSI bus TERMPWR signal
through fuse F4, located near J7. The
FUSES
LED (part of DS2) on the
MVME162LX front panel monitors the SCSI bus TERMPWR signal in
addition to LAN power; with the controller connected to an SCSI bus, the
FUSES
LED lights when SCSI terminator power is present.
Because any device on the SCSI bus can provide TERMPWR, the
FUSES
LED does not directly indicate the condition of the fuse. If the LED is not
lit during SCSI bus operation, the fuse should still be checked.
Local Resources
The MVME162LX Embedded Controller includes many resources for the
local processor. These include tick timers, software-programmable
hardware interrupts, a watchdog timer, and a local bus timeout.
Programmable Tick Timers
Four 32-bit programmable tick timers with a 1
µ
s resolution are provided
in the MCchip and two 32-bit programmable tick timers are provided in the
optional VMEchip2. The tick timers can be programmed to generate
periodic interrupts to the processor.
Refer to the VMEchip2 and MCchip in the MVME162LX Embedded
Controller Programmer’s Reference Guide for additional programming
information.
Watchdog Timer
A watchdog timer is provided in both the MCchip and the optional
VMEchip2. The timers operate independently but in parallel. When the
watchdog timers are enabled, they must be reset by software within the
programmed time or they will time out. The watchdog timers can be
programmed to generate a SYSRESET signal, local reset signal, or board
fail signal if they time out.
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 ...
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Страница 164: ...Ethernet Interconnections E 2 Computer Group Literature Center Web Site E ...
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