rtd CMV6486DX100HR, User Manual

Page: 40 / 118

40
To ensure correct operation, check that the keyboard is either an AT compatible keyboard or a swit-
chable XT/AT keyboard set to AT mode. Switchable keyboards are usually set by a switch on the
back or bottom of the keyboard.
System Reset
Pin 3 of the multifunction connector allows connection of an external push-button to manually reset
the system. The push-button should be normally open, and connect to ground when pushed.
Watchdog Timer
The active-high Watchdog signal generated on the cpuModule is available on pin 4 of the multifunc-
tion connector. The Watchdog time-out period is 1.2 seconds. If the Watchdog timer is not reset
within that period, it the Watchdog signal is asserted and the cpuModule is reset.
See Watchdog Timer Control on page 75 for more information on controlling the Watchdog Timer.
Battery
Pin 9 of the multifunction connector is the connection for an external backup battery (in the range
2.40V to 4.15V; typically 3.0 or 3.6V). This battery is used by the cpuModule when system power
is removed, to:
• preserve the date and time in the Real Time Clock
• preserve information stored in Static RAM in the Solid State Disk
If you wish to back-up Static RAMs in the Solid State Disk, please note that:
• jumpers must be correctly set;
see Storing Applications On-board on page 80
• SSD backup requires considerable battery power;
you may require a larger backup battery than supplied with the cable kit
Programming Voltage, Vpp
Pin 10 of the Multifunction connector is used when programming 12 volt Flash EPROMs in the
SSD. You must supply this pin with a programming voltage, Vpp, of 12VDC +/- 5% to program
these devices.
Refer to Storing Applications On-board on page 80 for more information.
Keyboard Connector
Pin Signal Function DIN
5 KBD Keyboard Data 2
6 KBC Keyboard Clock 1
7 GND Ground 4
8 KBP Keyboard Power 5
NOTE! Once programming voltage is applied to pin 10 of the Multifunction
connector, it still must be enabled to the individual SSD sockets:
Jumper JP1 pins 5-6 enable programming voltage to SSD socket U1.
Jumper JP2 pins 5-6 enable programming voltage to SSD socket U2.