XVME-240 (XYCOMVME)

The XVME-240 Digital Input/Output Module is an 80-channel, TTL-level, VMEbus-compatible I/O module. Sixty-four of these channels are arranged to form eight (byte-wide) bidirectional I/O ports. Each port can be separately programmed for either input or output by simply setting or clearing a single corresponding bit in the port direction register. The XVME-240 provides eight interrupt input lines to allow externally-connected devices to generate VMEbus interrupts on any level. The user has the option to control whether the board will latch the interrupt input signals on the rising or falling edge. Each interrupt line is also maskable via a programmable interrupt mask register. In addition, the XVME-240 has eight flag output lines which can be employed as external interrupt acknowledge lines or as control signal lines to any externally-connected devices.