Specifications

6Introduction
Keyboard/Mouse Controller
The cPCI-6840 uses a Winbond W83627HG to implement the
keyboard/mouse controller. The controller is fully 8042 compatible.
The cPCI-6840V provides a combo PS2 connector on the front
panel. Both cPCI-6840 and 6840V route the keyboard and mouse
signals to the J3.
Power Ramp Circuitry
The cPCI-6840 features a power controller with power ramp cir-
cuitry to allow the board's voltages to be ramped in a controlled
fashion. The power ramp circuitry eliminates any large voltage or
current spikes caused by hot-swapping boards. This controlled
ramping is a requirement of the CompactPCI hot-swap specifica-
tion, PICMG 2.1 Version 1.0. The cPCI-6840's power controller
unconditionally resets the board when it detects that the 3.3V, 5V,
and 12V supplies are below an acceptable operating limit. These
limits are defined as 4.75V (5V supply), 3.0V (3.3V supply), and
10.0V (+12V supply).
Watchdog Timer
Application can utilize watchdog timer to monitor system operation
and to recover the operation when an abnormal and unexpected
occurrence arises. The timeout period of the watchdog timer can
be programmed from one micro second to ten minutes. Failure to
strobe the watchdog timer within the programmed time period may
result in an interrupt or reset request. A register bit can be enabled
to indicate if the watchdog timer caused the interrupt or reset
event. This watchdog timer register can be cleared by the system
or auto-cleared after power-up, enabling system software to take
appropriate action if the watchdog generated the reboot. Please
refer Chapter 5, "Watchdog Timer," for more information.
Hardware Monitoring
The cPCI-6840 series use Winbond W83627HG to detect system
voltages and temperatures. When it detects the voltages or tem-
peratures over the safety range, it will inform the south bridge
6300ESB to send the signals out halting the system in order to
protect the CPU board.
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