TRICONEX 2750 Drive input card

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

The ICC counter circuitry consists of six programmable System 

Timing Controllers (STCs). Each STC provides the ICC with four high-speed counter/waveform synthesis interfaces, giving the VMIVME-2540 twenty-four channels of digital measurement and control. The STC counters may be configured individually or in groups of up to four to implement the various measurement and control functions. The on-board 68HC000 CPU configures and manages each STC interface directly, allowing the VMEbus host interface to be elevated above the hardware level. Ordering options allow the VMIVME-2540 to be factory configured with 1, 2, 4, or 6 System Timing Controllers. The inputs and outputs of the System Timing Controllers are buffered at the front panel connectors with RS-422 line receivers and line drivers. TTL input signal compatibility is supported by connecting the inverting input of the RS-422 line receiver to an on-board 1.4 V reference through the front panel, and the TTL signal to the noninverting input.

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