Chapter 1 – Introduction
1-5
Keyboard Interface
The keyboard interface uses a PS/2-style connector on the front panel. The +5 V is pro-
tected with a polyswitch. This device will open up if the +5 V is shorted to GND. Once
the shorting condition is removed, the polyswitch will allow current flow to resume.
Hard and Floppy Drives
The XVME-653/658 IDE hard drive and floppy drive signals are routed through the P2
connector, providing a simplified method of connecting external floppy and hard drives.
The XVME-653/658 will support only one floppy drive.
When used with the XVME-977 mass storage module, the hard and floppy drives do not
need to be located next to the processor. Using the supplied six-inch ribbon cable (which
connects the XVME boards’ J2 VME backplane connectors), the XVME-977 can be in-
stalled up to six slots away from the XVME-653/658 on the VME backplane. This al-
lows greater flexibility in configuring the VMEbus card cage.
For applications that require mass storage outside the VMEbus chassis, the XVME-973/1
drive adapter module plugs onto the VMEbus J2 connector. This module provides
industry standard connections for IDE and floppy signals. One floppy drive can be
connected to the XVME-973/1. This drive may be 2.88 MB, 1.44 MB, 1.2 MB, or 360
KB in size. For more information on the XVME-973/1, refer to Chapter 5.
Caution
The total cable length must not exceed 18 inches. If two drives are con-
nected, they must be no more than six inches apart.
Watchdog Timer
The XVME-653/658 incorporates a watchdog timer. When enabled, the timer can either
generate an interrupt or a master reset, depending on how you configure the watchdog
timer port. The timer input needs to be toggled within 1.6 seconds to prevent timeout.
Содержание XVME-653
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