VMIVME-2540-000  Intelligent Counter/Controller   

Description

VMIVME-2540-000  Intelligent Counter/Controller

• Event counting – up to 4 giga events
• Frequency measurement —1.16 x 10-3 Hz to 2.5 MHz
• Period/pulse-width measurement—400 ns to 8.5899 x 106 s (32-bit floating point), 400 ns to 858 s (32-bit unsigned integer)
• Square wave/pulse train generation – 0.0076 Hz to 2.5 MHz
• Timer/periodic VMEbus interrupter – 0.0076 to 1,000 Hz
• Quadrature position measurement – sin/cos up to 1 MHz, 32-bit counters, limit/modulo checking
• Integer period/pulse-width measurement 16- and 32-bit, discrete or continuous; low data transport lags
• Programmed output – up to 24 discrete outputs
• Pulse sequence mode – train of N pulses with programmable duty cycle
• Quadrature position control outputs – ±1/4 wave control resolution; up to 1.25 MHz step rate and ±32767 steps per command
• Integer QPM group acquisition – captures two integer QPM measurements simultaneously
• Event-triggered timer delay – generates VMEbus interrupt up to 131.1 seconds after event edge input; retriggerable
• 24 control/measurement interfaces: 24 clocks, 24 gates, 24 outputs
• RS-422 differential interface with support for single-ended TTL inputs
• Options allow configurations of 4, 8, 16, and 24 interfaces
• On-board 15 MHz 68HC000 CPU
• A32/A24/D32/D16/D8 (EO) VME slave interface, 64 Kbyte VMEbus memory window
• Data exchange interface: ANSI/IEEE standard 754-1985 for 32-bit floating-point arithmetic
• Continuous measurement modes
• VMEbus compatible ANSI/IEEE 1014-1987 IEC 821 and 297

VMIVME-2540

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. The block diagram of the VMIVME-2540 ICC is shown in Figure 1.

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