GE VMIVME-2540 24-Channel intelligent Controller

PRODUCT OVERVIEW — The VMIVME-2540

Intelligent Counter/Controller (ICC) is a VMEbus slave I/O

module designed to provide high-precision digital

measurement and function generation capability for

VMEbus systems with a simple, consistent

memory-mapped user interface. The following functions are

supported by the VMIVME-2540:

Measurement Functions

Event counting

Frequency measurement

Period/pulse-width measurement

Quadrature position measurement

Generation Functions

Pulse train/square wave generation

Timer/periodic interrupt generation

Frequency division

Quadrature position control

Once programmed by the VMEbus host, the

VMIVME-2540 ICC performs these functions

automatically. The on-board CPU maintains data structures

in shared local memory for buffering measurements and

queueing control commands. Measurement functions are

also supported by a Continuous Measurement Mode in

which measurements are made repeatedly without host CPU

involvement. I/O connections are routed through

high-density connectors located on the front panel with

support for differential and single-ended signal levels. The

user data exchange interface for measurement and

generation modes complies with ANSI/IEEE Standard

754-1985 for 32-bit floating-point arithmetic. Integer modes

operate with two’s complement signed arithmetic and with unsigned arithmetic.

TECHNICAL DESCRIPTION— The VMIVME-2540 ICC is comprised of three sections: the

VMEbus slave DTB interface which arbitrates for the local

CPU resources, the CPU with firmware and support logic,

and the circuitry which implements the measurement and control functions.